摘要:
A catalyst which comprises: a surface catalyst layer having a catalyst ingredient (A) comprising at least one member selected among solid acids and solid acids having, deposited thereon, an oxide and/or ions of at least one element selected among vanadium, tungsten, molybdenum, copper, iron, cobalt, nickel, and manganese; and an inner catalyst layer comprising a combination of a noble-metal catalyst ingredient (B) comprising at least one member selected among platinum, rhodium, palladium, and oxides of these and a catalyst ingredient (C) comprising ceria, praseodymium oxide, or an oxide mixture and/or composite oxide of at least two elements selected among cerium, zirconium, praseodymium, neodymium, terbium, samarium, gadolinium, and lanthanum. The catalyst is for use in catalytically reducing nitrogen oxides contained in an exhaust gas after a fuel is fed and burned under periodic rich/lean conditions; the resultant exhaust gas is brought into contact with the catalyst to catalytically reduce the nitrogen oxides. The method comprises bringing nitrogen oxides into contact with the catalyst to catalytically reduce the nitrogen oxides.
摘要:
The invention relates to a supported catalyst consisting of metal of the platinum group. Said catalyst can be obtained by means of controlled electroless deposition of at least one metal of the platinum group from a precipitation solution containing i) at least one homogeneously dissolved compound consisting of metal of the platinum group, ii) a reducing agent, and iii) at least one collagen selected from iospoly acids and heteropoly acids of niobium, tantalum, molybdenum, tungsten and vanadium or the salts of the same. The invention also relates to a method for hydrogenating inorganic or organic compounds using the catalyst which is produced by means of controlled electroless deposition, especially for the direct synthesis of hydrogen peroxide.
摘要:
A catalyst for acetic acid production which comprises as essential ingredients (a) palladium and (b) at least one compound selected among heteropolyacids and salts thereof and further contains (c) vanadium and/or molybdenum element in a specific proportion. Using thsi catalyst, acetic acid is produced from ethylene and oxygen through a vapor-phase one-stage reaction.
摘要:
A catalyst comprising particles of iridium oxide and a metal oxide (M oxide), wherein the metal oxide is selected from the group consisting of a Group 4 metal oxide, a Group 5 metal oxide, a Group 7 metal oxide and antimony oxide, wherein the catalyst is prepared by subjecting a precursor mixture to flame spray pyrolysis, wherein the precursor mixture comprises a solvent, an iridium oxide precursor and a metal oxide precursor is disclosed. The catalyst has particular use in catalysing the oxygen evolution reaction.
摘要:
A desulfurizer-reformer reactor system comprising a gradient assembly having a de- sulfurizing material and a reforming catalyst material arranged in a sequential manner and methods of generating energy are disclosed.
摘要:
The inventive catalyst for purifying gasoline and diesel engine sulfur oxide-containing exhaust gases comprises a modular porous carrier or filter provided with a catalytically active layer. In order to increase the catalyst stability, in addition to platinum and palladium, complex oxides of base metals like lithium, potassium, magnesium, barium, lead, lanthanum, cerium and bismuth, and of transition metals like nickel, cobalt, manganese, vanadium, niobium, molybdenum and tungsten are added into the catalytically active layer, the modular carrier being formed from acid-resistant porous ceramics based on aluminium, boron, phosphorus and silicium oxides embodied in the form of a module or filter. The inventive technical solution combines the functions of a stable three-functional catalyst and a filter-accumulator of smoke black particles and sulphuric-acid compounds, and carries out the catalytic regeneration of the filter at a normal and high engine load. The inventive catalyst can be used for reducing the emission of most toxic exhaust gases and solid particles of a diesel engine when it is combined with partial recirculation of purified exhaust gases.
摘要:
A catalyst for acetic acid production which comprises as essential ingredients (a) palladium and (b) at least one compound selected among heteropolyacids and salts thereof and further contains (c) vanadium and/or molybdenum element in a specific proportion. Using thsi catalyst, acetic acid is produced from ethylene and oxygen through a vapor-phase one-stage reaction.
摘要:
A honeycomb catalyst with a plurality of flow through channels, wherein the honeycomb catalyst comprises a corrugated substrate and optionally a liner applied on the corrugated substrate, the substrate and the optional liner are composed of a non-woven fibrous material, such as glass fibres, with a first coat of a ceramic material and a washcoat layer applied on the first coat ceramic material, the washcoat containing one or more catalytically active metals and/or metal oxides, such as vanadium oxide, tunsten oxide, zeolitic material, platinum and/or palladium.
摘要:
The present invention relates to the method of preparation and applications of composite catalyst of grapheno-metal oxide. Graphene platelets demonstrated to be very convenient support for metal-oxides catalysts. In particular, grapheno-metal oxide platelets can be used advantageously in organic synthesis, solar cells, solar hydrogen production and synthesis of methanol, taking advantage of metal-oxide semi-conductor properties or just of catalytic properties.
摘要:
A selective hydrogenation catalyst composition comprises at least two different metal components selected from Groups 8 to 10 of the Periodic Table of Elements, one of which may be rhodium, and at least one metal component selected from Group 13 of the Periodic Table of Elements, such as indium.