Abstract:
An improved noble metal alloy composition for a fuel cell catalyst, the alloy containing platinum, ruthenium, and nickel. The alloy shows methanol oxidation activity.
Abstract:
In one aspect, the invention includes a method of forming a roughened layer of platinum, comprising: a) providing a substrate within a reaction chamber; b) flowing an oxidizing gas into the reaction chamber; c) flowing a platinum precursor into the reaction chamber and depositing platinum from the platinum precursor over the substrate in the presence of the oxidizing gas; and d) maintaining a temperature within the reaction chamber at from about 0° C. to less than 300° C. during the depositing. In another aspect, the invention includes a platinum-containing material, comprising: a) a substrate; and b) a roughened platinum layer over the substrate, the roughened platinum layer having a continuous surface characterized by columnar pedestals having heights greater than or equal to about one-third of a total thickness of the platinum layer.
Abstract:
The invention relates to colloidal palladium composed of palladium clusters with an average particle diameter 0.2 nm≦d≦2 nm with at least 80% of the palladium clusters having a particle diameter which differs by not more than 0.2 nm from the average particle diameter d, it being possible for the palladium clusters to have protective ligands on the surface. The invention further relates to a process for preparing a colloidal solution of palladium by reacting a palladium salt with a reducing agent in solution at from 0 to 300° C., employing a branched-chain alcohol as reducing agent and phosphines and/or aromatic nitrogen compounds as protective ligands. The invention further relates to palladium-containing heterogeneous catalysts comprising colloidal palladium applied to a carrier, and to a process for their preparation.
Abstract translation:本发明涉及由平均粒径为0.2nm <= d <= 2nm的钯簇构成的胶体钯,其中至少80%的钯簇的粒径与平均粒径不同不超过0.2nm d,钯簇可以在表面上具有保护配体。本发明还涉及一种通过钯盐与还原剂在0-300℃溶液中反应来制备钯的胶体溶液的方法。 使用支链醇作为还原剂,以及膦和/或芳族氮化合物作为保护配体。本发明还涉及包含应用于载体的胶体钯的含钯非均相催化剂及其制备方法。
Abstract:
A co-catalyst for purifying an exhaust gas which can be used for a loner period of time as an actual catalyst by using the cerium oxide in the conventional co-catalyst for purifying the exhaust gas as a cerium-containing complex oxide for elevating the resistance to heat and suppressing the performance reduction due to thermal deterioration and by making a specific surface area and an oxygen storage capacity over specified values. A co-catalyst for purifying an exhaust gas of the present invention includes a composite oxide including (a) cerium; and (b) at least one element selected from the group consisting of zirconium, yttrium, strontium, barium and a rare-earth element supported on a particulate aluminum oxide support; a specific surface area of the co-catalyst after sintering being not less than 40 m2/g; an oxygen storage capacity at 400° C. being not less than 10 &mgr;mols/g and an oxygen storage capacity at 700° C. being not less than 100 &mgr;mols/g.
Abstract:
An adsorption plate formed of a carrier and a precious metal catalyst carried by the carrier is provided at that portion of at least one of a beam column and a sample chamber incorporated in a charged-particle beam apparatus, in which carbon compounds may be generated. Further, a precious metal catalyst is provided on each deflector electrode contained in the beam column.
Abstract:
A catalyst for selective hydrogenation of alkynes and dienes, its preparation process and application. The catalyst has an inorganic oxide support, a major active component palladium, and a Group IB metal promoter. The active components are uniformly distributed in the catalyst body within the thickness between the support surface and the depth of more than 300 &mgr;m. The catalyst of the present invention has high activity, high selectivity, ability to resist sulfur and arsenic poisoning. The catalyst is particularly applicable to C2-C3 fraction with any concentrations of hydrogen and CO.
Abstract:
A hydrophobic composite Pd-membrane catalyst, useful for the non-hazardous direct oxidation of hydrogen by oxygen to hydrogen peroxide, without a gas phase mixing of hydrogen and oxygen or air, having the general formula: HPM (c)/SOMF (b)/MxPd1−x (a)/IPM wherein, IPM is an inorganic porous membrane, MxPd1−x is a metal alloy, permeable only to hydrogen gas, Pd is a palladium metal; M is a metal other than palladium, or a mixture of two or more thereof; x is a mole fraction of the metal M in the metal alloy (MxPd1−x), a, in the round bracket, is a weight of the metal alloy per unit area of IPM; SOMF is a surface oxidized thin metal film comprising palladium b, in the round bracket, is a thickness of SOMF; HPM is a hydrophobic polymer membrane and c, in the round bracket , is a weight of the HPM per unit area of SOMF and a process for producing the said catalyst.
Abstract:
A process for preparing a catalyst which has a catalytically active coating of high surface area finely divided materials and catalytically active components on an inert carrier structure. A powder mixture of the finely divided materials used is impregnated with a solution of precursor compounds of the catalytically active components. By suitable combination of the finely divided materials and the precursor compounds and appropriate management of the impregnation process, a highly dispersed deposition and adsorption of the catalytically active components is ensured on the finely divided materials. Then ai aqueous coating dispersion is produced using the impregnated powder mixture and the carrier structure is coated therewith. The coating is then dried and calcined.
Abstract:
The method of the invention is based on the unique electron-carrying function of a photocatalytic unit such as the photosynthesis system I (PSI) reaction center of the protein-chlorophyll complex isolated from chloroplasts. The method employs a photo-biomolecular metal deposition technique for precisely controlled nucleation and growth of metallic clusters/particles, e.g., platinum, palladium, and their alloys, etc., as well as for thin-film formation above the surface of a solid substrate. The photochemically mediated technique offers numerous advantages over traditional deposition methods including quantitative atom deposition control, high energy efficiency, and mild operating condition requirements.
Abstract:
An ammine solution which can be provided at low production cost, as compared with conventional ones. The ammine solution contains an ammine compound which contains at least one of platinum and palladium, and at least one kind of amine compound. By using the amine compound of which the boiling point is raised, as compared with that of ammonia, due to the substitution of substitution radicals for some of hydrogens in ammonia molecules, the volatilizing speed from the ammine solution can be restrained.