摘要:
The present invention relates to a Pd-catalyst, comprising palladium and at least two metals selected from the group consisting of platinum, silver, manganese and bismuth, to its preparation and to its use as a selective hydrogenation catalyst for unsaturated hydrocarbons, particularly acetylene.
摘要:
A process and apparatus for steam reforming of hydrocarbons, using a sulfur-tolerant catalyst comprising an active phase and a support phase, and optionally a promoter, which provides substantially complete conversion of the hydrocarbon to a mixture of hydrogen, carbon monoxide, and carbon dioxide. The process comprises introducing steam and a hydrocarbon feed containing at least about 2 ppm sulfur species into the apparatus, and reacting said steam and hydrocarbon feed in the catalyst bed.
摘要:
A process for production of a supported catalyst that, when used for production of lower aliphatic carboxylic acids from oxygen and lower olefins, improves yields of the lower aliphatic carboxylic acids and minimizes production of carbon dioxide gas (CO2) by-product compared to the prior art. A compound comprising at least one element selected from elements of Groups 8, 9 and 10 of the Periodic Table, at least one chloride of an element selected from copper, silver and zinc, and a chloroauric acid salt, are loaded on a carrier, after which there are further loaded a compound comprising at least one element selected from gallium, indium, thallium, germanium, tin, lead, phosphorus, arsenic, antimony, bismuth, sulfur, selenium, tellurium and polonium, and a heteropoly acid.
摘要:
An emission control catalyst is doped with bismuth, manganese, or bismuth and manganese. The doped catalyst may be a palladium-gold catalyst or a platinum-based catalyst, or both. The doped palladium-gold catalyst and the doped platinum-based catalyst may be contained in a single washcoat layer or in different washcoat layers of a multi-brick, multi-zoned, or multi-layered emission control system. In all embodiments, zeolite may be added as a hydrocarbon absorbing component.
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:
The invention relates to a catalytically active composition containing Pd and Bi as active constituents, and at least one element selected from the group (a) consisting of Rh, Au, Sb, V, Cr, W, Mn, Fe, Co, Ni, Na, Cs and Ba; or Pd, Rh and Bi, and optionally an element selected from the group (a') consisting of Au, Sb, V, Cr, W, Mn, Fe, Co, Ni, Pt, Cu, Ag, Na, Cs, Mg, Ca and Ba. The invention also relates to a method for dehydrating hydrocarbons, preferably oxofunctionalised hydrocarbons such as cyclopentanone, cyclohexanone and isovaleraldehyde, by means of the catalytically active composition.
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:
A carrier for use in the catalyst for the production of an epoxide is obtained by preparing a carrier precursor containing (a) α-alumina, (b) silicon or a compound thereof, and (c) at least one element selected from the class consisting of germanium, tin, lead, phosphorus, antimony, and bismuth or a compound thereof and subsequently heat-treating the precursor in non-oxidative gas. The catalyst for the production of the epoxide is obtained by having silver deposited on this carrier and the epoxide is obtained from a corresponding unsaturated hydrocarbon of 2 - 4 carbon atoms with a high selectivity by using the catalyst.
摘要:
A process and apparatus for steam reforming of hydrocarbons, using a sulfur-tolerant catalyst comprising an active phase and a support phase, and optionally a promoter, which provides substantially complete conversion of the hydrocarbon to a mixture of hydrogen, carbon monoxide, and carbon dioxide. The process comprises introducing steam and a hydrocarbon feed containing at least about 2 ppm sulfur species into the apparatus, and reacting said steam and hydrocarbon feed in the catalyst bed.