Abstract: An oxygen storage material including a ceria-zirconia based composite oxide containing a composite oxide of ceria and zirconia, wherein the ceria-zirconia based composite oxide comprises at least one rare-earth element selected from the group consisting of lanthanum, yttrium, and neodymium, and an amount of the rare-earth element(s) contained in total is 1 to 10% by atom in terms of element relative to a total amount of cerium and zirconium in the ceria-zirconia based composite oxide, 60 to 85% by atom of the entire amount of the rare-earth element(s) is contained in a near-surface upper-layer region extending from a surface of each primary particle of the ceria-zirconia based composite oxide to a depth of 50 nm in the primary particle, and 15 to 40% by atom of the entire amount of the rare-earth element(s) is contained in a near-surface lower-layer region extending from a depth of 50 nm to a depth of 100 nm in the primary particle, a content ratio of cerium and zirconium in the ceria-zirconia based compos

Abstract: The invention relates to polyoxometalates represented by the formula (An)m+[M?M12X8OyRzHq]m? or solvates thereof, corresponding supported polyoxometalates, and processes for their preparation, as well as corresponding metal clusters, optionally in the form of a dispersion in a liquid carrier medium or immobilized on a solid support, and processes for their preparation, as well as their use in reductive conversion of organic substrate.

Abstract: The invention relates to polyoxometalates represented by the formula (An)m+[M?M12Oy(RCOO)zHq]m? or solvates thereof, corresponding supported polyoxometalates, and processes for their preparation, as well as corresponding metal clusters, optionally in the form of a dispersion in a liquid carrier medium or immobilized on a solid support, and processes for their preparation, as well as their use in reductive conversion of organic substrate.

Abstract: The invention concerns a catalyst comprising at least the element tantalum, and at least one mesoporous oxide matrix that has undergone an acid wash comprising at least 90% by weight of silica before washing, the mass of the element tantalum being in the range 0.1% to 30% of the mass of said mesoporous oxide matrix.

Abstract: An improved isobutanol synthesis process is provided which proceeds through the formation of mixed alcohols from syngas. The two-step process avoids the slowest ?-carbon addition reaction in the conventional one-step, direct isobutanol synthesis process. Once ethanol and propanol are produced in the first reaction zone, they can react with methanol and/or syngas in a second reaction zone to produce isobutanol through the fast ?-carbon addition reaction in the presence of catalysts, resulting on significantly improved isobutanol productivity.

Abstract: The invention relates to a catalyst that comprises a mesoporous oxide matrix, with said matrix comprising at least one oxide of an element X that is selected from among silicon and titanium, taken by itself or in a mixture, with said catalyst comprising at least the tantalum element and the niobium element, with the tantalum mass representing between 0.1 to 30% by weight of the mass of the mesoporous oxide matrix, the niobium mass representing between 0.02 to 6% by weight of the mass of the mesoporous oxide matrix, the content by mass of the tantalum element being greater than or equal to the content by mass of the niobium element. The invention also relates to the use of this catalyst in a method for the production of 1,3-butadiene from a feedstock that comprises at least ethanol.

Abstract: A method for oxidizing carbon monoxide (CO) and volatile organic compounds (VOCS) comprises contacting a gas containing water vapor and said CO and VOCs with a catalyst composition comprising at least one base metal promoter and at least one base metal catalyst supported on an oxide support material comprising one or more of alumina, silica, zirconia, ceria, and titania, wherein the VOCs comprise one or more of methyl acetate, methane, methyl bromide, benzene, methanol, methyl ethyl ketone, butane, and butene.

Abstract: To provide a copper and/or copper oxide dispersion capable of forming an electroconductive film exhibiting excellent stability with respect to temporal change and having a fine pattern form, an electroconductive film laminate obtained by laminating the electroconductive film produced using the copper and/or copper oxide dispersion, and an electroconductive film transistor. The copper and/or copper oxide dispersion contains 0.50-60 mass % of copper and/or copper oxide microparticies and the following components (1)-(4): (1) a surface energy modifier; (2) an organic compound having a phosphate group; (3) 0.050-10 mass % of a solvent having a vapor pressure of 0.010 Pa to less than 20 Pa at 20° C.; and (4) a solvent having a vapor pressure of 20 Pa to 150 hPa at 20° C. The electroconductive laminate is obtained by laminating an electroconductive film containing copper on a substrate.

Abstract: A catalysed soot filter comprises an oxidation catalyst for oxidizing NO to NO2 and/or oxidizing CO to CO2 and/or HC to CO2 and H2O disposed on a wall flow filter monolithic substrate, the oxidation catalyst comprising: a platinum group metal component, and a pre-calcined support material comprising a mixed magnesium aluminium metal oxide having a magnesium content, calculated as Mg, of 15 wt % Mg or lower.

Abstract: A method is described for preparing a catalyst including the steps of: (i) impregnating a calcined support comprising a metal aluminate with a solution of nickel acetate at a temperature ?40° C. and drying the impregnated support, (ii) calcining the dried impregnated support, to form nickel oxide on the surface of the support and (iii) optionally repeating steps (i) and (ii) on the nickel oxide coated support. The method provides an eggshell catalyst in which the metal oxide is concentrated in an outer layer on the support.

Abstract: The present invention discloses a process to treat a ferrite based catalyst useful in the oxidative dehydrogenation of monololefins and diolefins which process includes a preheat step prior to use of the catalyst in the OXO-D reactor. The catalyst is preferably a zinc ferrite catalyst for the production of butadiene. It has been observed that substantially no nitrogen oxide emissions result from the use of this treated catalyst in the reactor unit during the oxidative dehydrogenation reaction.

Abstract: An embodiment of the invention provides a method for forming a magnesium (Mg)-containing coating layer on the surface of a metal support, which comprises a first step of preparing a precursor solution containing a magnesium component, a second step of forming a precipitate on the surface of a metal support by immersing and aging the metal support in the precursor solution prepared in the first step, and a third step of forming a magnesium-containing coating layer on the surface of the metal support by calcinating the precipitate formed in the second step.

Abstract: Disclosed are a molybdenum based composite oxide catalyst, its preparation method and use. The catalyst has the following general formula: BiMoxMyNzOa; wherein M is one of V, Cr, Mn, Fe, Co, Ni and Cu, or a mixture of two or more of V, Cr, Mn, Fe, Co, Ni and Cu in any ratio; N is one of Na, K, Cs, Ca and Ba, or a mixture of two or more of Na, K, Cs, Ca and Ba in any ratio; x=0.5˜20; y=0.05˜20; z=0.01˜5; a is a number satisfying the valance of each atom. The catalyst is prepared by the following method: firstly mixing a certain amount of the lead metal oxides according to the chemical proportion and then grinding the mixture with high-energy ball milling for a period of time to obtain the molybdenum based composite oxide catalyst. The catalyst exhibits excellent performance when using for preparation of butadiene by oxidative dehydrogenation of butene, and the preparation process is simple, controllable, and repeatable.

Abstract: The invention relates to the field of pharmaceutics, pharmaceutical nano-technology and pharmacology and concerns a system for delivering biologically active agents into an organism, the system comprising a nano-diamond with a particle size of 2-10 nm, the surface of said particles being modified by chlorine with a chlorine content of up to 14%, and to a method for producing said system.

Abstract: A method is described for preparing a catalyst including the steps of: (i) impregnating a calcined support comprising a metal aluminate with a solution of nickel acetate at a temperature ?40° C. and drying the impregnated support, (ii) calcining the dried impregnated support, to form nickel oxide on the surface of the support and (iii) optionally repeating steps (i) and (ii) on the nickel oxide coated support. The method provides an eggshell catalyst in which the metal oxide is concentrated in an outer layer on the support.

Abstract: The present invention relates to a process for producing ethylene and propylene from syngas, the process comprising the steps of a) contacting syngas (2) with a first catalyst composition to obtain a first product stream (3) comprising ethylene, propylene and aliphatic hydrocarbons having 4 or more carbon atoms, b) splitting the first product stream (3) into a second product stream (5) comprising at least 90% of said aliphatic hydrocarbons having 4 or more carbon atoms and a third product stream (4) comprising ethylene and propylene, 3) separating ethylene and propylene in the third product stream so as to form a first ethylene stream (17) and a first propylene stream (16) and d) converting the second product stream (5) into a fourth product stream (8) comprising ethylene and/or propylene.

Abstract: The invention relates to a catalytically active body for the synthesis of dimethyl ether from synthesis gas. In particular, the invention relates to an improved catalytically active body for the synthesis of dimethyl ether, whereby the components of the active body comprise a defined particle size distribution. Furthermore, the present invention concerns a method for the preparation of a catalytically active body, the use of the catalytically active body and a method for preparation of dimethyl ether from synthesis gas.

Abstract: The invention relates to the field of pharmaceutics and medicine and concerns a nano-diamond conjugate with glycine for delivering glycine into an organism, the conjugate comprising nano-diamond particles modified by glycine, with a particle size of 2-10 nm, and containing up to 21% by mass of glycine which is included in the composition of the superficial shell of said particles with a thickness of up to 1 nm, and to a method for producing said conjugate.

Abstract: A method of making a catalyst comprises: mixing a catalytically active component and a surfactant to form a mixture, wherein the catalytically active component comprises phosphorus; forming a gel; physically shearing the gel to form a physically sheared gel; combining the physically sheared gel with a support; and calcining the support with the physically sheared gel to form the catalyst. Another method of making a catalyst comprises: mixing a catalytically active component and a surfactant to form a mixture, wherein the catalytically active component comprises phosphorus; letting the mixture sit without mixing for greater than 1 hour to form a set mixture; subjecting the set mixture to shear to form a sheared mixture; combining the sheared mixture with a support; and calcining the support with the sheared mixture to form the catalyst.

Abstract: The disclosure provides molybdenum and/or tungsten containing catalyst materials useful for the sour gas shift reactions and methods for using such catalyst materials, for example, for converting carbon monoxide and steam to carbon dioxide and hydrogen.

Abstract: A process for biomass catalytic cracking is disclosed herein. More specifically, the process is in presence of is a mixed metal oxide catalyst represented by the formula (X1O).(X2O)a.(X3YbO4) wherein X1, X2 and X3 are alkaline earth elements selected from the group of Mg, Ca, Be, Ba, and mixture thereof, and Y is a metal selected from the group of Al, Mn, Fe, Co, Ni, Cr, Ga, B, La, P and mixture thereof, wherein the catalyst is formed by calcining at least one compound comprising at least one alkaline earth element and a metal element.

Abstract: A process for treating a carrier, or a precursor thereof, to at least partly remove impurities from the carrier, or the precursor thereof, comprising: contacting the carrier, or the precursor thereof, with a treatment solution comprising a salt in a concentration of at most 0.05 molar, wherein the salt comprises a cation and an anion, and wherein the cation is selected from ammonium, phosphonium, organic cations and combinations thereof, and wherein the anion is selected from organic anions, inorganic carboxylates, oxyanions of elements from Groups IIIA through VIIA of the Periodic Table of Elements, and combinations thereof; and separating at least part of the treatment solution from the carrier, or the precursor thereof.

Abstract: The present invention relates to catalysts, to processes for making catalysts and to chemical processes employing such catalysts. The multifunctional catalysts are preferably used for converting acetic acid and ethyl acetate to ethanol. The catalyst is effective for providing an acetic acid conversion greater than 20% and an ethyl acetate conversion greater than 0%. The catalyst comprises a precious metal and one or more active metals on a modified support. The modified support includes a metal selected from the group consisting of tungsten, vanadium, and tantalum, provided that the modified support does not contain phosphorous.

Abstract: Stabilized palladium (+1) compounds to mimic rhodium's electronic configuration and catalytic properties are disclosed. Palladium (+1) compounds may be stabilized in perovskite or delafossite structures and may be employed in Three-Way Catalysts (TWC) for at least the conversion of HC, CO and NOx, in exhaust gases. The TWC may include a substrate, a wash-coat and, a first impregnation layer, a second impregnation layer and an over-coat. The second impregnation layer and the over-coat may include palladium (+1) based compounds as catalyst.

Abstract: A carrier for an ethylene epoxidation catalyst is provided that includes an alumina first component and a mixed metal oxide of alumina second component. The mixed metal oxide of alumina second component comprises a corundum lattice structure having a plurality of O—Al—O bonds, wherein an Al atom of at least one O—Al—O bond of the plurality of O—Al—O bonds, but not all of the plurality of O—Al—O bonds, is replaced with a divalent or trivalent transition metal selected from the group consisting of scandium (Sc), titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni) copper (Cu), and zinc (Zn). A catalyst containing the carrier, as well as a process for the epoxidation of ethylene using the catalyst are also disclosed.

Abstract: A porous oxide catalyst includes porous oxide, and an oxygen vacancy-inducing metal which induces an oxygen vacancy in a lattice structure of a porous metal oxide.

Abstract: A catalyst has a long life span and efficiently separates hydrogen from water. A first metal element (Ni, Pd, Pt) for cutting the combination of hydrogen and oxygen and a second metal element (Cr, Mo, W, Fe) for helping the function of the first metal element are melted in alkaline metal hydroxide or alkaline earth metal hydroxide to make a mixture heated at a temperature above the melting point of the hydroxide to eject fine particles from the liquid surface, bringing steam into contact with the fine particles. Instead of this, a mixture of alkaline metal hydroxide and metal oxide is heated at a temperature above the melting point of the alkaline metal hydroxide to make metal compound in which at least two kinds of metal elements are melted, and fine particles are ejected from the surface of the metal compound to be brought into contact with steam.

Abstract: Metal oxide catalysts comprising various dopants are provided. The catalysts are useful as heterogenous catalysts in a variety of catalytic reactions, for example, the oxidative coupling of methane to C2 hydrocarbons such as ethane and ethylene. Related methods for use and manufacture of the same are also disclosed.

Abstract: A method for oxidizing a carbonaceous material, the method comprising contacting the carbonaceous material with an effective amount of a catalytic material of formula AxMyWOz, and initiating the oxidization of the carbonaceous material at a first temperature lower than a second temperature at which the carbonaceous material is initiated to oxidize without a catalyst, wherein A is at least one of cesium and potassium, M is different from A and is at least one of cesium, potassium, magnesium, calcium, strontium, barium, iron, cobalt, nickel, ruthenium, rhodium, palladium, silver, osmium, iridium, platinum, gold, yttrium, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, and bismuth, 0?x?1, 0?y?1, 2.2?z?3, when x=0, y>0, and when y=0, x>0.

Abstract: A process of contacting an alkylene oxide with 2-methoxy-1-propanol (PM1) in the presence of an oligomeric Schiff base metal complex catalyst is disclosed. Further, a process involving contacting an alkylene oxide with an alkyl alcohol using an oligomeric Schiff base metal complex as a catalyst is also disclosed. Additionally, novel compositions which can be used as catalysts in processes involving the contacting of an alkyl alcohol with an alkylene oxide are also disclosed.

Abstract: Disclosed are dehydrogenation catalyst composites and methods of making the dehydrogenation catalyst composites. The dehydrogenation catalyst composites contain alumina, lithium oxide, alkaline earth metal oxide, chromium oxide, and sodium oxide. Also disclosed are methods of dehydrogenating a dehydrogenatable hydrocarbon involving contacting the dehydrogenatable hydrocarbon with a dehydrogenation catalyst composite containing alumina, lithium oxide, alkaline earth metal oxide, chromium oxide, and sodium oxide to provide a dehydrogenated hydrocarbon, such as an olefin.

Abstract: The invention relates to the development of a catalyst for selectively producing acetic acid from a gaseous feedstock of ethane, ethylene or mixtures thereof and oxygen at a low temperature. Said gaseous feedstock is brought together with a catalyst containing the oxides of Mo, V and Nb and nano metallic Pd optionally together with a hetero-poly acid and/or Sb and Ca. The present catalytic system provides both higher selectivity and yield of acetic with minimal production of side products of ethylene and CO.

Abstract: Disclosed herein are mixed oxide catalysts for the catalytic gas phase oxidation of alkanes, or mixtures of alkanes and olefins, for the production of aldehydes and carboxylic acids with air or oxygen in the presence of inert gases at elevated temperatures and pressure, and a method for the production of catalysts.

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 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 process of contacting an alkylene oxide with 2-methoxy-1-propanol (PM1) in the presence of an oligomeric Schiff base metal complex catalyst is disclosed. Further, a process involving contacting an alkylene oxide with an alkyl alcohol using an oligomeric Schiff base metal complex as a catalyst is also disclosed. Additionally, novel compositions which can be used as catalysts in processes involving the contacting of an alkyl alcohol with an alkylene oxide are also disclosed.

Abstract: Provided is a catalyst for preparing a syngas by reforming methane wherein a nickel-based catalyst is mixed with a metal oxide catalyst. More particularly, alumina is used as a support and a metal oxide catalyst including magnesia, nickel, vanadium, tungsten, iron, molybdenum or chromium is used to inhibit carbon deposition and maintain or improve catalytic activity.

Abstract: A mixed oxide catalyst includes a support material selected from the group comprising aluminum oxide, magnesium oxide, titanium oxide, and mixtures of aluminum oxide, magnesium oxide, and titanium oxide, and a catalyst active component comprising cobalt oxide and molybdenum oxide. The catalyst active component is nanodispersed in the support material.

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: In a process for forming a bulk hydroprocessing catalyst by sulfiding a catalyst precursor made in a co-precipitation reaction, up to 60% of the metal precursor feeds end up in the supernatant. The metals can be recovered via any of chemical precipitation, ion exchange, electro-coagulation, and combinations thereof to generate an effluent stream containing less than 50 mole % of metal ions in at least one of the metal residuals, and for at least one of the metal residuals recovered as a metal precursor feed for use in the co-precipitation reaction. In one embodiment, the resin functions as an anion exchange resin with an acidic supernatant to recover Group VIB metal residuals, and a cation exchange resin with a basic supernatant to recover Promoter metal residuals. An effluent stream from the process to waste treatment contains less than 50 ppm metals.

Abstract: The sequential production of a library of N different solids, in particular heterogeneous catalysts, where N within a day is an integer of at least 2, is performed by a) producing at least two different sprayable solutions, emulsions and/or dispersions of elements and/or element compounds of the chemical elements present in the catalyst and optionally of dispersions of inorganic support materials, b) continuously metering the at least two different solutions, emulsions and/or dispersions in a predefined ratio into a mixing apparatus in which the solutions, emulsions and/or dispersions are homogeneously mixed, c) continuously drying the mixture removed from the mixing apparatus and recovering the dried mixture, d) changing the ratios in step b) and repeating steps b), c) and d) (N?1) times until N different dried mixtures are obtained, e) optionally shaping and optionally calcining the mixtures to give the solids.

Abstract: Disclosed is a vanadium/titania-based catalyst including natural manganese ore for removing nitrogen oxides and dioxin in a wide operating temperature range and a method of using the same. Specifically, this invention pertains to a vanadium/titania (V/TiO2)-based catalyst, including natural manganese ore, and a method for removing nitrogen oxides and dioxin over a wide operating temperature range, in which the WTiO2 catalyst for selective catalytic reduction of nitrogen oxides and removal of dioxin contained in flue gas includes 5-30 wt % of natural manganese ore.

Abstract: The present invention relates to a catalyst composition for the synthesis of thin multi-walled carbon nanotube(MWCNT). More particularly, this invention relates to a multi-component metal catalyst composition comprising i) main catalyst of Co and Al, ii) inactive support of Mg and iii) optional co-catalyst at least one selected from Ni, Cr, Mn, Mo, W, Pb, Ti, Sn, or Cu. Further, the present invention affords thin multi-walled carbon nanotube having 5˜20 nm of diameter and 100˜10,000 of aspect ratio in a high yield.

Abstract: A bulk metal oxide catalyst composition of the general formula (X)b(M)c(Z)d(O)e??(I) wherein X represents at least one non-noble Group VIII metal; M represents at least one non-noble Group VIb metal; Z represents one or more elements selected from aluminum, silicon, magnesium, titanium, zirconium, boron, and zinc; one of b and c is the integer 1; and d and e and the other of b and c each are a number greater than 0 such that the molar ratio of b:c is in the range of from 0.5:1 to 5:1, the molar ratio of d:c is in the range of from 0.2:1 to 50:1, and the molar ratio of e:c is in the range of from 3.7:1 to 108:1; is prepared by controlled (co)precipitation of component metal compounds, refractory oxide material, and alkali compound in protic liquid. Resulting compositions find use in hydrotreatment processes involving particularly hydrodesulphurization and hydrodenitrification.

Abstract: A catalyst of one or more complex oxides having a nominal composition as set out in formula (1): AxB1-y-zMyPzOn (1) wherein A is selected from one or more group III elements including the lanthanide elements or one or more divalent or monovalent cations; B is selected from one or more elements with atomic number 22 to 24, 40 to 42 and 72 to 75; M is selected from one or more elements with atomic number 25 to 30; P is selected from one or more elements with atomic number 44 to 50 and 76 to 83; x is defined as a number where 0<x?1; y is defined as a number where 0?y<0.5; and z is defined as a number where 0<z<0.2.

Abstract: To provide a novel visible light-responsive photocatalyst or tungsten oxide visible light-responsive semiconductor improved in environmental resistance under an alkaline condition. The tungsten oxide visible light-responsive semiconductor unstable under an alkaline condition is improved in environmental resistance without losing photocatalytic function thereof by adding thereto at least one element selected from the group consisting of copper, tantalum, niobium, lanthanum, bismuth, calcium, chromium, manganese and zinc. The obtained environmental resistant visible light-responsive photocatalyst is subjected to an alkaline treatment to thereby be improved in photocatalytic activity.

Abstract: In a process for forming a bulk hydroprocessing catalyst by sulfiding a catalyst precursor made in a co-precipitation reaction, up to 60% of the metal precursor feeds do not react to form catalyst precursor and end up in the supernatant. In the present disclosure, the metals can be recovered via any of chemical precipitation, ion exchange, electro-coagulation, and combinations thereof to generate an effluent stream containing less than 50 mole % of metal ions in at least one of the metal residuals, and for at least one of the metal residuals is recovered as a metal precursor feed, which can be recycled for use in the co-precipitation reaction. An effluent stream from the process to waste treatment contains less than 50 ppm metal ions.

Abstract: A catalyst for use in the production of an unsaturated aldehyde and/or an unsaturated carboxylic acid, the catalyst comparing (or, preferably, being composed of) a mixed oxide containing molybdenum, bismuth and iron, which has improved methanical strength, is produced by a method including the steps of (1) drying an aqueous solution or an aqueous slurry containing raw materials of the catalyst and then firstly calcining a dried product in a molecular oxygen-containing gas atmosphere to obtain a calcined product; (2) heating the calcined product obtained in Step (1) in the presence of a reducing material to obtain a reduced product having a mass loss of 0.05 to 6%; and (3) secondly calcining the reduced product obtained in Step (2) in a molecular oxygen-containing gas atmosphere.

Abstract: In a process for forming a bulk hydroprocessing catalyst by sulfiding a catalyst precursor in a co-precipitation reaction, up to 60% of the metal precursor feeds do not react to form catalyst precursor and stay in the supernatant. In one embodiment, at least a precipitant is added to the product mixture at a molar ratio of precipitant to metal residuals in the supernatant ranging from 1.5:1 to 20:1 to precipitate at least 50 mole % of metal ions in the residuals forming additional catalyst precursor. The remaining metal residuals can be recovered via any of chemical precipitation, ion exchange, electro-coagulation, and combinations thereof to generate an effluent stream containing less than 50 mole % of at least one of the metal residuals. In one embodiment, at least one of the metal residuals is recovered and recycled for use as a metal precursor feed in the co-precipitation reaction.