Abstract: A one-layer three-way catalyst is described for the cleaning of the exhaust gases of internal combustion engines with outstanding activity and thermal stability. The catalyst comprises an active aluminum oxide, a first cerium/zirconium mixed oxide and a second cerium/zirconium mixed oxide. The first cerium/zirconium mixed oxide has a higher zirconium oxide content than the second mixed oxide. The first cerium/zirconium mixed oxide is catalytically activated with rhodium and the second cerium/zirconium mixed oxide with palladium.

Abstract: A method for preparing metal compound nanoparticles, comprising treating a uniform dispersion of at least one metal precursor in an organic solvent with a supercritical carbon dioxide fluid to attain a homogeneous mixture, which is subjected to a solvothermal reaction under a supercritical CO2 condition, makes it easy to prepare nanoparticles of a metal oxide, a doped metal compound, or a metal complex having various shapes.

Abstract: A method of preparing a catalyst coating solution may realize high purification performance by preventing the active surface of a catalyst from being reduced, and may greatly improve the durability of a catalyst by preventing soot from directly coming into contact with a catalyst layer containing a precious metal so that the catalyst layer can continuously exhibit proper purification performance. A method of manufacturing a catalyst body using the catalyst coating solution, and a catalyst body manufactured by the method are also described.

Abstract: Nano-structured noble metal catalysts based on hexametallate lattices, of a spinel block type, and which are resistant to carbon deposition and metal sulfide formation are provided. The catalysts are designed for the reforming of hydrocarbon fuels to synthesis gas. The hexametallate lattices are doped with noble metals (Au, Pt, Rh, Ru) which are atomically dispersed as isolated sites throughout the lattice and take the place of hexametallate metal ions such as Cr, Ga, In, and/or Nb. Mirror cations in the crystal lattice are selected from alkali metals, alkaline earth metals, and the lanthanide metals, so as to reduce the acidity of the catalyst crystal lattice and enhance the desorption of carbon deposit forming moieties such as aromatics. The catalysts can be used at temperatures as high as 1000° C. and pressures up to 30 atmospheres. A method for producing these catalysts and applications of their use also is provided.

Abstract: The disclosure relates to aluminum titanate-forming batch materials comprising inorganic batch components comprising at least one alkaline earth carbonate having a specified particle size distribution, methods of making ceramic bodies using the same, and ceramic bodies made in accordance with said methods.

Abstract: A niobium suboxide powder comprising niobium suboxide particles having a bulk nitrogen content of between 500 to 20,000 ppm. The nitrogen is distributed in the bulk of the powder particles. The nitrogen at least partly is present in the form of at least one of Nb2N crystals or niobium oxynitride crystals.

Abstract: A process for producing geometric shaped catalyst bodies K whose active material is a multielement oxide of stoichiometry [Bi1WbOx]a[Mo12Z1cZ2dFeeZ3fZ4gZ5hOy]1, in which a finely divided oxide Bi1WbOx with the particle size d50A1 and, formed from element sources, a finely divided intimate mixture of stoichiometry Mo12Z1cZ2dFeeZ3fZ4gZ5h with the particle size d90A2 are mixed in a ratio of a:1, this mixture is used to form shaped bodies and these are treated thermally, where (d50A1)0.7·(d90A2)1.5·(a)?1?820. A shaped catalyst body obtained by the process. A catalyst obtained by grinding the shaped catalyst body. A process for heterogeneously catalyzing the partial gas phase oxidation of an alkane, alkanol, alkanal and/or an alkenal of 3 to 6 carbon atoms using the catalyst.

Abstract: The present invention relates to a method of preparing a spherical mesoporous silica structure containing silver nanoparticles dispersed therein by adding a silver nitrate solution to an aqueous surfactant solution and performing a sol-gel process and to spherical mesoporous silica prepared thereby. The spherical mesoporous silica is cost-effective compared to a conventional method that uses silver nanoparticles as a raw material, because the silver nitrate solution that is inexpensive compared to silver nanoparticles is used. Also, the spherical mesoporous silica can be with high productivity in large amounts, and thus is easily commercialized. Moreover, because silver nanoparticles are incorporated into the pores of the mesoporous silica, the silver nanoparticles are used stably and do not change color and odor. In addition, the spherical mesoporous silica exhibits various additional effects, including far-infrared ray emission and deodorization, attributable to silica.

Abstract: Oxychlorination catalyst compositions which include a catalytically effective amount of an oxychlorination catalyst and a diluent having certain chemical composition and/or physical properties are disclosed. Processes using such oxychlorination catalyst compositions are also described. Some oxychlorination catalyst compositions and processes disclosed herein can increase the optimal operating temperature, and thereby increase the production capacity of an existing reactor, such as a fluid-bed reactor, compared to other oxychlorination catalyst compositions.

Abstract: An exhaust gas purification catalyst includes a catalytic layer containing a particle component A-1 and a particle component A-2 with different catalytic metal contents, each of which is composed of catalytic-metal-doped CeZr-based mixed oxide powder. The particle component A-1 having the lower catalytic metal content is supported on a particle component B composed of Zr-based-oxide-supported alumina powder, and the particle component A-2 having the higher catalytic metal content is supported on a particle component C composed of CeZr-based mixed oxide powder in which catalytic metal is not solid-dissolved.

Abstract: A catalyst layer includes: a first mixed oxide particle component 4 which contains Ce and Rh 8 and in which Rh is partially exposed at particle surfaces; and a second mixed oxide particle component 5 containing Ce, Zr, and a rare earth metal except Ce. The particle size distribution of the first mixed oxide particle component 4 has a peak in the particle size range from 100 nm to 300 nm, both inclusive. The particle size distribution of the second mixed oxide particle component 5 has a peak in a particle size range larger than the particle size range in which the first mixed oxide particle component 4 has the peak. At least part of particles of the first mixed oxide particle component 4 is attached to at least part of particles of the second mixed oxide particle component 5.

Abstract: One aspect of the present invention relates to a method for synthesizing macro-sized nanostructures. The method in one embodiment comprises the steps of mixing an amount of TiO2 powders with a volume of an alkali or alkaline solution to form a mixture, and heating the mixture at a temperature higher than 160° C. for a period of time effective to allow TiO2-containing, macro-sized nanostructures to form, wherein the TiO2-containing, macro-sized nanostructures form in an environment that has no presence of a substrate that comprises Ti. These TiO2-containing, macro-sized nanostructures can be utilized to form a free standing membrane, and/or a three-dimensional (3D) structure.

Abstract: Catalysts for the decomposition of N2O into nitrogen and oxygen in the gas phase, which comprises a porous support composed of polycrystalline or vitreous inorganic material, a cerium oxide functional layer applied thereto and a layer of oxidic cobalt-containing material applied thereto are described. The catalysts can be used, in particular, as secondary or tertiary catalysts in nitric acid plants.

Abstract: Disclosed is a method of preparing high crystalline nanoporous titanium dioxide, in which the high crystalline nanoporous titanium dioxide, which is harmless to the human body and self-purified through the decomposition of organic matters, is prepared in mass production at the room temperature through a simply synthesis method. The method includes the steps of (a) mixing a titanium precursor and a surfactant in a solvent and performing a sol-gel reaction at a room temperature; (b) maturing a reactant obtained through the sol-gel reaction at the room temperature; (c) filtering the matured reactant and washing the matured reactant; and (d) drying the washed reactant to obtain titanium dioxide having nanopores.

Abstract: A water absorbing agent and a method for producing the water absorbing agent are disclosed. Water absorbent resin particles having an internal cross-linked structure obtained by polymerizing a water-soluble unsaturated monomer, organic acid, and water-soluble multivalent metal salt are mixed, so that it is possible to provide a water absorbing agent which suppresses permeation of metal components into the water absorbent resin particles and enables the metal components to evenly adhere to an entire surface of the water absorbent resin in a dot manner.

Abstract: A process for producing geometric shaped catalyst bodies K whose active material is a multielement oxide of stoichiometry [Bi1WbOx]a[Mo12Z1cZ2dFeeZ3fZ4gZ5nOy]1, in which a finely divided oxide Bi1WbOx with the particle size d50A1 and, formed from element sources, a finely divided intimate mixture of stoichiometry Mo12Z1cZ2dFeeZ3fZ4gZ5h with the particle size d50A2 are mixed in a ratio of a:1, this mixture is used to form shaped bodies and these are treated thermally, where (d50A1)0.7·(d90A1)1.5·(a)?1?820.

Abstract: Mixed oxides catalysts usable in particular in the full oxidation to CO2 and H2O of volatile organic compounds (VOC), in the decomposition of nitrogen protoxide to nitrogen and oxygen and the combustion of CO, H2 and CH4 off gases in fuel cells, comprising oxides of manganese, copper and La2O3 and/or Nd2O3, having a percentage composition by weight expressed as MnO, CuO, La2O3 and/or Nd2O3 respectively of 35-56%, 19-31% and 20-37%. The oxides are supported on inert porous inorganic oxides, preferably alumina.

Abstract: A catalyst for removing nitrogen protoxide from gas mixtures which contain it, comprising mixed oxides of cobalt, manganese and rare earth metals having composition expressed as percentage by weight of CoO, MnO and transition metal oxide in the lowest state of valence as follows: MnO 38-56%, CoO 22-30%, rare earth metal oxide 22-32%.

Abstract: Granular polycrystalline silicon is disclosed, which has a convexity of 0.850-1.000 and a chlorine content of 10-40 ppmw. Also disclosed is a process for producing granular polycrystalline silicon in a fluidized bed reactor, which includes: (a) fluidization of silicon seed particles by gas flow in a fluidized bed heated by a heating apparatus, (b) addition of a silicon- and halogen-containing reaction gas resulting in pyrolytic deposition of elemental silicon on heated seed particle surfaces, (c) forming the granular polycrystalline silicon, (d) removing from the reactor particles and offgas containing hydrogen halide, and (e) metered addition of fresh seed particles. The hydrogen halide concentration in the offgas is determined as the controlled variable. The rate of metered addition of fresh seed particles and heating output of the heating apparatus are controlled as manipulated variables to keep the hydrogen halide concentration in the offgas within an above-defined range during operation.

Abstract: A method of preparing titania nanotubes involves anodization of titanium in the presence of chloride ions and at low pH (1-7) in the absence of fluoride. The method leads to rapid production of titania nanotubes of about 25 nm diameter and high aspect ratio. The nanotubes can be organized into bundles and tightly packed parallel arrays. Inclusion of organic acids in the electrolyte solution leads to the incorporation into the nanotubes of up to 50 atom percent of carbon. In a two-stage method, a titanium anode is pre-patterned using a fluoride ion containing electrolyte and subsequently anodized in a chloride ion containing electrolyte to provide more evenly distributed nanotube arrays. The titania nanotubes have uses in composite materials, solar cells, hydrogen production, and as hydrogen sensors.