摘要:
The invention relates to a catalyst comprising at least one group VIII metal M, tin, a phosphorus promoter, a halogen compound, a porous support and at least one promoter X1 selected from the group containing gallium, indium, thallium, arsenic, antimony and bismuth. Using 119 Sn Mössbauer spectroscopy the reduced form of the catalyst exhibits a signal with a quadrupole splitting value of between 0 and 0.45 mm/s and an isomeric shift IS of between 1.5 and 2.4 mm/s in relation to CaSnO 3 , said signal representing between 1 and 30 % of the total area of the signals.
摘要:
A method and catalysts for producing a hydrogen-rich syngas are disclosed. According to the method a CO-containing gas contacts a water gas shift (WGS) catalyst, in the presence of water, preferably at a temperature of less than about 450° C. to produce a hydrogen-rich syngas. Also disclosed is a water gas shift catalyst formulated from: a) Pt, its oxides or mixtures thereof, b) at least one of Fe and Rh, their oxides and mixtures thereof, and c) at least one member selected from the group consisting of Sc, Y, Ti, Zr, V, Nb, Ta, Mo, Re, Co, Ni, Pd, Ge, Sn, Sb, La, Ce, Pr, Nd, Sm, and Eu, their oxides and mixtures thereof. The WGS catalyst may be supported on a carrier, such as any one member or a combination of alumina, zirconia, titania, ceria, magnesia, lanthania, niobia, yttria and iron oxide. Fuel processors containing such water gas shift catalysts are also disclosed.
摘要:
An on-line method of synthesizing or regenerating catalysts for autothermal oxidation processes, specifically, the oxidation of paraffinic hydrocarbons, for example, ethane, propane, and naphtha, to olefins, for example, ethylene and propylene. The catalyst comprises a Group 8B metal, for example, a platinum group metal and, optionally, a promoter, such as tin, antimony, or copper, on a support, preferably a monolith support. On-line synthesis or regeneration involves co-feeding a volatile Group 8B metal compound and/or a volatile promoter compound with the paraffinic hydrocarbon and oxygen into the oxidation reactor under ignition or autothermal conditions.
摘要:
A catalytic composite for a cyclic process of adiabatic, non-oxidative dehydrogenation of an alkane into an olefin, comprising a dehydrogenation catalyst, a semimetal and a carrier supporting the catalyst and the semimetal. During the reduction and/or regeneration stages of the adiabatic process, the semimetal releases heat which can be used to initiate the dehydrogenation reactions, which are endothermic in nature, thereby reducing the need for hot air flow and combustion of coke as heat input. The semi-metal is inert towards the dehydrogenation reaction itself, alkane feed and olefin product as well as other side reactions of the cyclic process such as cracking and decoking.
摘要:
A fuel catalyst for improving combustion efficiency is provided that includes at least one hydride producing element, and at least one element of greater activity on the electrolytic scale than the hydride producing element and at least one element of lesser activity on the electrolytic scale than the hydride producing element. The hydride producing element preferably includes an element from at least one of a Group IV and Group V of the periodic table. The element of greater activity and the element of lesser activity preferably includes at least one of zinc, magnesium, aluminum, palladium, silver, copper and cerium. Preferred formulations of the catalyst element include: a) 20-60 wt.% antimony, 10-30 wt.% tin, 10-80 wt.% zinc and 1-5 wt.% silver; b) 40 wt. % antimony, 18 wt.% tin, 40 wt. % zinc and 2 wt. % silver; c) 20-60 wt. % antimony, 10-30 wt. % tin, 20-80 wt. % magnesium, 1-8 wt. % cerium and 0.1 - 1.0 wt. % palladium; d) 40 wt. % antimony, 25 wt. % tin, 30 wt. % magnesium, 4.8 wt. % cerium and 0.2 wt. % palladium; and e) 25 wt. % antimony, 25 wt. % tin, 39 wt. % zinc and 11 wt. % aluminum.
摘要:
This invention relates to a composition comprising antimony trifluoride and silica, a method for the preparation of said composition and the use of said composition as catalyst. Examples of the silica are hexagonal mesoporous silica (HMS) or silica gel. The catalyst may be used in the oxidation of cyclohexanone to epsilon-caprolactone with hydrogen peroxide.
摘要:
A fuel catalyst for improving combustion efficiency is provided that includes at least one hydride producing element, and at least one element of greater activity on the electrolytic scale than the hydride producing element and at least one element of lesser activity on the electrolytic scale than the hydride producing element. The hydride producing element preferably includes an element from at least one of a Group IV and Group V of the periodic table. The element of greater activity and the element of lesser activity preferably includes at least one of zinc, magnesium, aluminum, palladium, silver, copper and cerium. Preferred formulations of the catalyst element include: a) 20-60 wt.% antimony, 10-30 wt.% tin, 10-80 wt.% zinc and 1-5 wt.% silver; b) 40 wt.% antimony, 18 wt.% tin, 40 wt.% zinc and 2 wt.% silver; c) 20-60 wt.% antimony, 10-30 wt.% tin, 20-80 wt.% magnesium, 1-8 wt.% cerium and 0.1-1.0 wt.% palladium; d) 40 wt.% antimony, 25 wt.% tin, 30 wt.% magnesium, 4.8 wt.% cerium and 0.2 wt.% palladium; and e) 25 wt.% antimony, 25 wt.% tin, 39 wt.% zinc and 11 wt.% aluminum.