Abstract: A method for making a catalyst composition suitable for various purposes, such as the reduction of nitrogen oxides, is provided. The method includes combining dawsonite or a dawsonite derivative with a catalytic active element.

Abstract: A hydroprocessing co-catalyst composition may comprise in an embodiment a first component comprising co-catalyst particles and a liquid carrier, and a second component comprising a dispersant and a dispersant diluent. The co-catalyst particles may be in the micron size range, and the dispersant may promote dispersion of the co-catalyst particles in materials such as the liquid carrier, the dispersant diluent, and combinations thereof. Methods of introducing a hydroprocessing co-catalyst composition into a hydroprocessing system are also disclosed.

Abstract: A NOx storage component comprises caesium silicate (Cs2SiO3) and at least one platinum group metal. The invention also includes a NOx absorber catalyst comprising a NOx storage component according to the invention disposed on a substrate monolith; a method of treating exhaust gas containing NOx from a lean burn internal combustion engine comprising the steps of contacting a NOx storage component comprising caesium silicate (Cs2SiO3) and at least one platinum group metal with lean exhaust gas containing NOx to adsorb NOx thereon; and periodically desorbing adsorbed NOx by contacting the NOx storage component with stoichiometric or rich exhaust gas; and a method of making a NOx storage component according to the invention comprising the steps of combining and reacting an aqueous salt of at least one platinum group metal, an aqueous caesium salt and a source of silica.

Abstract: A metal catalyst is formed by vaporizing a quantity of metal and a quantity of carrier forming a vapor cloud. The vapor cloud is quenched forming precipitate nanoparticles comprising a portion of metal and a portion of carrier. The nanoparticles are impregnated onto supports. The supports are able to be used in existing heterogeneous catalysis systems. A system for forming metal catalysts comprises means for vaporizing a quantity of metals and a quantity of carrier, quenching the resulting vapor cloud and forming precipitate nanoparticles comprising a portion of metals and a portion of carrier. The system further comprises means for impregnating supports with the nanoparticles.

Abstract: A catalyst for NOx storage and reduction may include a carrier that contains alkali metal and Al, or alkali earth metal and Al, a NOx storage element of alkali metal, alkali earth metal or rare earth element, and one or more noble metals that are selected from the group consisting of Pt, Pd, Ru, Ag, Au and Rh. The catalyst for NOx storage and reduction shows excellent NOx storage and reduction capability, maintains excellent storage and reduction capability especially before and after deterioration and sulfation, and shows excellent catalytic activity under low temperature environment, while maintaining unusually high hydrophobicity.

Abstract: Described is a nitrogen oxide storage catalyst comprising: a substrate; a first washcoat layer provided on the substrate, the first washcoat layer comprising a nitrogen oxide storage material, a second washcoat layer provided on the first washcoat layer, the second washcoat layer comprising a hydrocarbon trap material, wherein the hydrocarbon trap material comprises substantially no element or compound in a state in which it is capable of catalyzing selective catalytic reduction, preferably wherein the hydrocarbon trap material comprises substantially no element or compound in a state in which it is capable of catalyzing a reaction wherein nitrogen oxide is reduced to N2, said catalyst further comprising a nitrogen oxide conversion material which is either comprised in the second washcoat layer and/or in a washcoat layer provided between the first washcoat layer and the second washcoat layer.

Abstract: The present disclosure relates to a substrate comprising nanomaterials for treatment of gases, washcoats for use in preparing such a substrate, and methods of preparation of the nanomaterials and the substrate comprising the nanomaterials. More specifically, the present disclosure relates to a substrate comprising nanomaterial for three-way catalytic converters for treatment of exhaust gases.

Abstract: The present invention provides methods and designs of enclosed-channel reactor system for manufacturing catalysts or supports. Both of the configuration designs force the gaseous precursors and purge gas flow through the channel surface of reactor. The precursors will transform to thin film or particle catalysts or supports under adequate reaction temperature, working pressure and gas concentration. The reactor body is either sealed or enclosed for isolation from atmosphere. Another method using super ALD cycles is also proposed to grow alloy catalysts or supports with controllable concentration. The catalysts prepared by the method and system in the present invention are noble metals, such as platinum, palladium, rhodium, ruthenium, iridium and osmium, or transition metals such as iron, silver, cobalt, nickel and tin, while supports are silicon oxide, aluminum oxide, zirconium oxide, cerium oxide or magnesium oxide, or refractory metals, which can be chromium, molybdenum, tungsten or tantalum.

Abstract: The present invention relates to a photocatalytic material having a visible light activity which includes a tungsten-doped titanium oxide or a tungsten/gallium-codoped titanium oxide, and a divalent copper salt and/or a trivalent iron salt supported on a surface of the doped or codoped titanium oxide, and a process for producing the photocatalytic material.

Abstract: The invention provides an exhaust gas cleaning oxidation catalyst and in particular to an oxidation catalyst for cleaning the exhaust gas discharged from internal combustion engines of compression ignition type (particularly diesel engines). The invention further relates to a catalysed substrate monolith comprising an oxidising catalyst on a substrate monolith for use in treating exhaust gas emitted from a lean-burn internal combustion engine. In particular, the invention relates to a catalysed substrate monolith comprising a first washcoat coating and a second washcoat coating, wherein the second washcoat coating is disposed in a layer above the first washcoat coating.

Abstract: The present invention a catalyst that includes a metallic or ceramic foam catalyst support having surfaces within the foam for the placement of a catalytic material, and an active catalyst material which is applied by washcoating or dipping.

Abstract: A catalyst for the purification of exhaust gas that can be used to highly efficiently treat an exhaust gas which has moisture and fluctuates between an oxidizing atmosphere and a reducing atmosphere even after the catalyst is exposed to a high temperature is provided. The present invention relates to a catalyst for the purification of exhaust gas having a catalyst layer of catalyst components comprising a noble metal, magnesium oxide, and a refractory inorganic oxide formed on a three-dimensional structure, wherein the catalyst layer has two peaks originated from the magnesium oxide in a pore distribution obtained by mercury intrusion technique.

Abstract: A nanoparticle comprises a nano-active material and a nano-support. In some embodiments, the nano-active material is platinum and the nano-support is alumina. Pinning and affixing the nano-active material to the nano-support is achieved by using a high temperature condensation technology. In some embodiments, the high temperature condensation technology is plasma. Typically, a quantity of platinum and a quantity of alumina are loaded into a plasma gun. When the nano-active material bonds with the nano-support, an interface between the nano-active material and the nano-support forms. The interface is a platinum alumina metallic compound, which dramatically changes an ability for the nano-active material to move around on the surface of the nano-support, providing a better bond than that of a wet catalyst. Alternatively, a quantity of carbon is also loaded into the plasma gun.

Abstract: The present invention provides rhenium-promoted epoxidation catalysts based upon shaped porous bodies comprising a minimized percentage of their total pore volume being present in pores having diameters of less than one micron, and a surface area of at least about 1.0 m2/g. Processes of making the catalysts and using them in epoxidation processes are also provided.

Abstract: The present invention relates to preparation of porous gallium (III) oxide [Ga2O3] photocatalyst for production of hydrocarbons a porous gallium oxide photocatalyst for production of hydrocarbons, manufactured by the foregoing method, and a process of producing hydrocarbons using the porous gallium oxide photocatalyst for production of hydrocarbons, manufactured by the foregoing method.

Abstract: A method for providing a catalyst on a substrate is disclosed comprising providing a first washcoat comprising a soluble washcoat salt species, a polar organic solvent, and an insoluble particulate material, contacting the first washcoat with a substrate to form a coated substrate, and then contacting the coated substrate with a second washcoat comprising an oxide or an oxide-supported catalyst to physisorb, chemisorb, bond, or otherwise adhere the oxide or the oxide-supported catalyst to the coated substrate. Also disclosed is a catalyst on a substrate comprising: a substrate; an anchor layer comprising a soluble washcoat salt species, a polar organic solvent, and an insoluble particulate material; and a second layer comprises an oxide or an oxide-supported catalyst. The catalyst on a substrate can be in either green or fired form.

Abstract: Catalytic forms and formulations are provided. The catalytic forms and formulations are useful in a variety of catalytic reactions, for example, the oxidative coupling of methane. Related methods for use and manufacture of the same are also disclosed.

Abstract: The invention relates to a catalytically active particulate filter which, in addition to the properties typical of particulate filters, has hydrogen sulphide block function, and to a process for removing nitrogen oxides and particulates from the exhaust gas of internal combustion engines operated predominantly under lean conditions (so-called “lean-burn engines”) using the inventive catalytically active particulate filter. This particulate filter comprises a filter body, a copper compound and an oxidation-catalytic active coating which comprises at least one catalytically active platinum group metal. The copper compound is in a second coating applied to the filter body. The two functional coatings may be applied to the filter body consecutive in the direction of flow, i.e. zoned, or layered one on top of the other.

Abstract: A catalyst for NOx storage and reduction may include a carrier that contains alkali metal and Al, or alkali earth metal and Al, a NOx storage element of alkali metal, alkali earth metal or rare earth element, and one or more noble metals that are selected from the group consisting of Pt, Pd, Ru, Ag, Au and Rh. The catalyst for NOx storage and reduction shows excellent NOx storage and reduction capability, maintains excellent storage and reduction capability especially before and after deterioration and sulfation, and shows excellent catalytic activity under low temperature environment, while maintaining unusually high hydrophobicity.

Abstract: The present invention relates to methods for producing metal-supported thin layer skeletal catalyst structures, to methods for producing catalyst support structures without separately applying an intermediate washcoat layer, and to novel catalyst compositions produced by these methods. Catalyst precursors may be interdiffused with the underlying metal support then activated to create catalytically active skeletal alloy surfaces. The resulting metal-anchored skeletal layers provide increased conversion per geometric area compared to conversions from other types of supported alloy catalysts of similar bulk compositions, and provide resistance to activity loss when used under severe on-stream conditions. Particular compositions of the metal-supported skeletal catalyst alloy structures can be used for conventional steam methane reforming to produce syngas from natural gas and steam, for hydrodeoxygenation of pyrolysis bio-oils, and for other metal-catalyzed reactions inter alia.

Abstract: A method and system for the reduction of pollutant NOx gases from automobile exhaust, as well as a method of reforming hydrocarbons, using a self-sustaining catalyst comprising an ion conductive support, a dispersed cathodic phase, a dispersed anodic phase, and a dispersed sacrificial phase, and a method of forming the self-sustaining catalyst.

Abstract: An exhaust gas purifying catalyst that contains a first oxygen storage material on which no noble metal is supported and which has a pyrochlore phase type regular array structure, and a second oxygen storage material which has a higher oxygen storage rate and a lower oxygen storage capacity than the first oxygen storage material and on which a platinum group noble metal is supported.

Abstract: Embodiments include metal catalyst compositions and methods of forming metal catalyst compositions.

Abstract: A catalyst particle for use in growth of elongated nanostructures, such as e.g. nanowires, is provided. The catalyst particle comprises a catalyst compound for catalyzing growth of an elongated nanostructure comprising a nanostructure material without substantially dissolving in the nanostructure material and at least one dopant element for doping the elongated nanostructure during growth by substantially completely dissolving in the nanostructure material. A method for forming an elongated nanostructure, e.g. nanowire, on a substrate using the catalyst particle is also provided. The method allows controlling dopant concentration in the elongated nanostructures, e.g. nanowires, and allows elongated nanostructures with a low dopant concentration of lower than 1017 atoms/cm3 to be obtained.

Abstract: A supported platinum catalyst comprising an open-pored support material and platinum of oxidation state 0, wherein an XRD spectrum of the catalyst is free of signals of elemental platinum.

Abstract: An exhaust gas purifying catalyst (1) of the present invention includes anchor/promoter simultaneous enclosure particles (5) including catalyst units (13) which contain: noble metal particles (8); and anchor particles (9) as an anchor material of the noble metal particles (8) supporting the noble metal particles (8); promoter units (14) which are provided not in contact with the noble metal particles (8) and contain first promoter particles (11) having an oxygen storage and release capacity; and an enclosure material (12) which encloses both the catalyst units (13) and the promoter units (14), and separates the noble metal particles (8) and the anchor particles (9) in the catalyst units (13) from the first promoter particles (11) in the promoter units (14). The exhaust gas purifying catalyst (1) further includes second promoter particles (6) which have the oxygen storage and release capacity, and are not enclosed in the anchor/promoter simultaneous enclosure particles (5) by the enclosure material (12).

Abstract: The present invention provides porous body precursors and shaped porous bodies. Also included are catalysts and other end-use products based upon the shaped porous bodies and thus the porous body precursors. Finally, processes for making these are provided. The porous body precursors comprise a precursor alumina blend capable of enhancing one or more properties of a shaped porous body based thereupon. The need to employ modifiers to achieve a similar result may thus be substantially reduced, or even avoided, and cost savings are thus provided, as well as savings in time and equipment costs.

Abstract: A catalytic article for decomposition of a volatile organic compound includes a porous support body, a plurality of active centers formed on the support body and adapted for catalytic decomposition of the volatile organic compound, and a plurality of capture centers bound to the support body. Each of the active centers is composed of one of a noble metal, a transition metal oxide, and the combination thereof. Each of the capture centers includes at least one functional group that is adapted for attracting or binding the volatile organic compound. A method for preparing the catalytic article is also disclosed.

Abstract: A method of making a high activity catalyst composition suitable for use in the hydrodesulfurization of a middle distillate feed, such as diesel fuel, having a high concentration of sulfur, to thereby provide a low sulfur middle distillate product. The method comprises heat treating aluminum hydroxide under controlled temperature conditions thereby converting the aluminum hydroxide to gamma-alumina to give a converted aluminum hydroxide, and controlling the fraction of converted aluminum hydroxide that is gamma-alumina. A catalytic component is incorporated into the converted aluminum hydroxide to provide an intermediate, which is heat treated to provide the high activity catalyst composition. The high activity catalyst composition can suitably be used in the hydrodesulfurization of a middle distillate feed containing a high sulfur concentration.

Abstract: A method of making a metal oxide nanoparticle comprising contacting an aqueous solution of a metal salt with an oxidant. The method is safe, environmentally benign, and uses readily available precursors. The size of the nanoparticles, which can be as small as 1 nm or smaller, can be controlled by selecting appropriate conditions. The method is compatible with biologically derived scaffolds, such as virus particles chosen to bind a desired material. The resulting nanoparticles can be porous and provide advantageous properties as a catalyst.

Abstract: The invention provides a catalyst for catalytically removing three components, which are carbon monoxide, hydrocarbons and nitrogen oxides, from combustion exhaust gas generated by combusting fuel at around the stoichiometric air to fuel ratio. The catalyst includes: (A) a first catalyst component including at least rhodium, platinum, or palladium in a content of 0.01 to 0.5% by weight; and (B) a second catalyst component, which is the remainder, including a composite oxide or a mixed oxide including (a) at least zirconium oxide or titanium oxide, and (b) an oxide of at least praseodymium, yttrium, neodymium, tungsten, niobium, silicon, or aluminum, wherein the content of the oxide (a) in the composite oxide or the mixed oxide is in a range of 70 to 95% by weight. The invention further provides a two-layer catalyst that includes a surface catalyst layer containing the above-mentioned catalyst.

Abstract: A nano-particle comprising: an interior region comprising a mixed-metal oxide; and an exterior surface comprising a pure metal. In some embodiments, the mixed-metal oxide comprises aluminum oxide and a metallic pinning agent, such as palladium, copper, molybdenum, or cobalt. In some embodiments, the pure metal at the exterior surface is the same as the metallic pinning agent in the mixed-metal oxide in the interior region. In some embodiments, a catalytic nano-particle is bonded to the pure metal at the exterior surface. In some embodiments, the interior region and the exterior surface are formed using a plasma gun. In some embodiments, the interior region and the exterior surface are formed using a wet chemistry process. In some embodiments, the catalytic nano-particle is bonded to the pure metal using a plasma gun. In some embodiments, the catalytic nano-particle is bonded to the pure metal using a wet chemistry process.

Abstract: A double-layer three-way catalyst for purification of the exhaust gases from internal combustion engines which has excellent activity and thermal stability is described. The catalyst contains active aluminum oxide and a first cerium/zirconium mixed oxide which are both catalytically activated with palladium in the first layer applied to a catalyst support. In the second layer which is in direct contact with the exhaust gas, the catalyst likewise contains an active aluminum oxide and a second cerium/zirconium mixed oxide which are both catalytically activated with rhodium. The second cerium/zirconium mixed oxide has a higher zirconium oxide content than the first mixed oxide.

Abstract: The present subject matter provides a method of preparing a multicomponent metal-hybrid nanocomposite using co-gasification, in which a multicomponent metal-hybrid nanocomposite can be prepared by a one-step process without using a complicated process including the steps of supporting-drying-calcining-annealing and the like at the time of preparing a conventional alloy catalyst, and provides a multicomponent metal-hybrid nanocomposite prepared by the method. The method is advantageous in that a multicomponent metal-hybrid nanocomposite can be synthesized by a simple process of simultaneously gasifying two kinds of metal precursors, and in that an additional post-treatment process is not required.

Abstract: A catalytic material including particles formed of a catalytic core material having a thermally resistant porous shell coated over the catalytic core material. An oxygen storage material is dispersed within the thermally resistant porous shell. In an example, the oxygen storage material is ceria. The catalytic material can further include a catalytic support, wherein the particles are deposited on the catalytic support. The catalytic support can be a powdered oxide including a material selected from the group consisting of alumina, silica, zirconia, niobia, ceria, titania, and combinations thereof. The catalytic core can include an element selected from the group consisting of Pt, Pd, Rh, Co, Ni, Mn, Cu, Fe, Au, Ag, and combinations thereof. The porous shell can be selected from materials consisting of alumina, baria, ceria, magnesia, niobia, silica, titania, yttria, and combinations thereof.

Abstract: A catalyst support which may be used to support various catalysts for use in reactions for hydrogenation of carbon dioxide including a catalyst support material and an active material capable of catalyzing a reverse water-gas shift (RWGS) reaction associated with the catalyst support material. A catalyst for hydrogenation of carbon dioxide may be supported on the catalyst support. A method for making a catalyst for use in hydrogenation of carbon dioxide including application of an active material capable of catalyzing a reverse water-gas shift (RWGS) reaction to a catalyst support material, the coated catalyst support material is optionally calcined, and a catalyst for the hydrogenation of carbon dioxide is deposited on the coated catalyst support material. A process for hydrogenation of carbon dioxide and for making syngas comprising a hydrocarbon, esp. methane, reforming step and a RWGS step which employs the catalyst composition of the present invention and products thereof.

Abstract: The present invention relates to a process for preparing a catalyst, at least comprising the steps of adding a protecting agent to an aqueous solution of a metal precursor to give a mixture (M1), adding a reducing agent to mixture (M1) to give a mixture (M2), adding a support material to mixture (M2) to give a mixture (M3), adjusting the pH of mixture (M3), and separating the solid and liquid phase of mixture (M3). Furthermore, the present invention relates to the catalyst as such and its use as diesel oxidation catalyst.

Abstract: A process for hydrogenating highly unsaturated hydrocarbons to less unsaturated hydrocarbons wherein production of saturated hydrocarbons is minimized. The process utilizes catalyst including Ce2O3, MgO, and an inorganic support, and optionally palladium, optionally silver, and/or an optional alkali metal.

Abstract: Disclosed herein is a catalytically active particulate filter, an exhaust gas cleaning system and a process for cleaning the exhaust gases of predominantly stoichiometrically operated internal combustion engines, which are suitable, as well as the gaseous CO, HC and NOx pollutants, also for removing particulates from the exhaust gas. The particulate filter comprises a filter body and a catalytically active coating consisting of two layers. The first layer is in contact with the incoming exhaust gas, the second layer with the outgoing exhaust gas. Both layers contain alumina. The first layer contains palladium. The second layer contains, in addition to rhodium, an oxygen-storing cerium/zirconium mixed oxide.

Abstract: A CO2 reforming catalyst may include at least one catalyst metal supported in a porous carrier. The at least one catalyst metal may include a transition metal (e.g., Ni, Co, Cr, Mn, Mo, Ag, Cu, Zn, and/or Pd). Each particle of the at least one catalyst metal may be bound with the porous carrier in a form of an alloy. The porous carrier may form a rod-shaped protruding portion around the catalyst metal particle.

Abstract: The invention concerns a catalyst comprising a porous support, palladium, at least one metal selected from the group constituted by alkalis and alkaline-earths, in which: the specific surface area of the porous support is in the range 50 to 210 m2/g; the palladium content in the catalyst is in the range 0.05% to 2% by weight; at least 80% by weight of the palladium is distributed in a crust at the periphery of the support, the thickness of said crust being in the range 20 to 200 ?m; the metallic dispersion D is in the range 25% to 70%; the density of the palladium particles in the crust is in the range 1500 to 4100 particles of palladium per ?m2; and said alkali and/or alkaline-earth metal is distributed homogeneously across the support. The invention also concerns the preparation of the catalyst and its use in selective hydrogenation.

Abstract: A mesoporous oxide-catalyst complex including: a mesoporous metal oxide; and a catalyst metal supported on the mesoporous metal oxide, wherein the catalyst on the mesoporous metal oxide has a degree of dispersion of about 30 to about 90 percent.

Abstract: The invention relates to chemical compositions that can be used for hydrocarbon catalytic cracking processes with vanadium as a contaminant, including an active phase formed by different pyrophosphates M2P2O7 (M=Ba or Ca) supported on a mixture of magnesium and aluminum oxide, preferably magnesium aluminate in the spinel phase. The composition captures the metals originating from the charge, particularly vanadium, and thus protects the catalyst. Said composition is preferably used in the form of a separated particle in order to the control the addition thereof to the unit according to the metal content of the charge. The invention also relates to the method for preparing said composition, including synthesis of pyrophosphates, formation of a suspension of boehmite alumina, magnesium oxide or magnesium hydroxide, together with oxides M2P2O7, spray drying and calcination of the microspheres without generating any loss in the crystalline structure of oxides M2P2O7.

Abstract: The invention relates to a method for preparing a chemical composition obtained by co-impregnating water-soluble salts Ba/Mg and phosphoric acid H3PO4 on boehmite alumina which has been calcined in the presence of water vapor. Said chemical composition is used as an additive in the catalytic cracking process in order to capture metals originating from the charge, particularly vanadium, in the presence of SO2 and thus to protect the activity and selectivity of the catalytic cracking catalyst.

Abstract: A method of forming a catalyst, comprising: providing a plurality of support particles and a plurality of mobility-inhibiting particles, wherein each support particle in the plurality of support particles is bonded with its own catalytic particle; and bonding the plurality of mobility-inhibiting particles to the plurality of support particles, wherein each support particle is separated from every other support particle in the plurality of support particles by at least one of the mobility-inhibiting particles, and wherein the mobility-inhibiting particles are configured to prevent the catalytic particles from moving from one support particle to another support particle.

Abstract: Multilayer substrates for the growth and/or support of CNT arrays are provided. These multilayer substrates both promote the growth of dense vertically aligned CNT arrays and provide excellent adhesion between the CNTs and metal surfaces. Carbon nanotube arrays formed using multilayer substrates, which exhibit high thermal conductivity and excellent durability, are also provided. These arrays can be used as thermal interface materials.

Abstract: A rare earth alumina particulate composition manufacturing method and application are disclosed. The rare earth alumina of the invention is a particulate of porous structure with a molecular formula (REx,Al1-x)2O3, phase ? or ?+? characterized by a particle size distribution ranging from 1 to 80 ?m with a D50 of 5 to 15 ?m, a pore size distribution ranging from 0.4-200 nm with an average pore diameter of 8 to 30 nm, a pore volume (PV) raging from 0.5 to 1.2 cc/g and a fresh specific surface area (SA) ranging from 130 to 250 m2/g after calcination at 500-900° C. for 5 to 10 hours. The rare earth alumina retains a SA of greater than 60 m2/g after calcination at 1200° C. for 4 hours and greater than 40 m2/g after calcination at 1200° C. for 50 hours. There is no presence of the ? phase or other impurity phases in the long-term aged samples. The rare earth alumina of the invention has a high thermal stability and is a fine three-way catalyst support material.

Abstract: Catalyst compositions include finely divided nanoscale particles of at least one supported oxide selected from among zirconium oxide, titanium oxide or a mixed zirconium/titanium oxide deposited onto an alumina-based or aluminum-oxyhydroxide-based support, wherein, after calcination for 4 hours at 900° C., the at least one support oxide is in the form of nanoscale particles deposited onto the support, the size of said particles being at most 10 nm when the at least one supported oxide is based is zirconium oxide and being at most 15 nm when the at least one supported oxide is titanium oxide or a mixed zirconium/titanium oxide; such catalyst compositions are especially useful for the selective reduction of NOx.

Abstract: There is provided by the present invention a process for preparing a copper-based catalyst having good catalytic activity, markedly excellent durability and good reproducibility. The process for preparing a copper-based catalyst of the invention is a process for preparing a catalyst composed of metal oxides containing copper oxide as an essential component and is characterized by comprising the following steps: (1) a step of bringing an acidic metal salt solution containing copper and a precipitant solution into contact with each other to obtain a slurry solution containing a precipitate of a catalyst precursor, and (2) a step of continuously bringing the slurry solution and a wash liquid into contact with each other to wash the precipitate, with substantially keeping the suspended state.

Abstract: The present invention relates to a catalyst combination for hydrotreating raw oils and a process for hydrotreating raw oils with the catalyst combination. The catalyst combination comprises one or both of at least one hydrogenation protection catalyst I and at least one hydrogenation demetalling catalyst I; at least one hydrogenation demetalling catalyst II; and at least one hydrogenation treatment catalyst III.