摘要:
A method for controlling exhaust gas emissions from an engine (16) includes extracting a light distillate fuel (Fd) from conventional gasoline or other liquid hydrocarbon fuel and supplying the engine with the light distillate fuel during an initial operation period of the engine. This reduces the oxidizable pollutants in the engine exhaust during a cold-start period before a catalytic converter (22) used to abate pollutants in the engine exhaust gases has not yet attained its operating temperature. After the catalytic converter (22) has been sufficiently heated, the fuel supply to the engine (16) is switched to gasoline or other liquid hydrocarbon fuel. Both the distillate fuel (Fd) and the liquid hydrocarbon fuel may be passed through a heated cracking catalyst bed (30) to crack the fuel fed to the engine.
摘要:
A catalyst composition comprising an amorphous sulfide of trivalent chromium and at least one metal selected from the group consisting of (a) molybdenum, tungsten and mixture thereof and (b) mixtures of (a) with Fe, Ni, Co, Mn, Cu, Zn and mixture thereof is prepared by heating one or more precursors at a temperature of at least about 200.degree. C. under oxygen-free conditions in the presence of a sulfur, wherein said precursor is selected from the group consisting of [Cr.sub.1-z M.sub.z LX.sub.y ](MoS.sub.4).sub.n, [Cr.sub.1-z M.sub.z LX.sub.y ](WS.sub.4).sub.n and mixtures thereof, wherein M is one or more divalent promoter metals selected from the group consisting of Mn, Fe, Co, Ni, Cu, Zn and mixtures thereof, wherein L is one or more neutral nitrogen-containing ligands, wherein ligand X is a singly-charged anionic species and wherein 1>z.gtoreq.0, 1-z.gtoreq.y.gtoreq.0, and wherein n equals (3-z-y)/2. These compositions have been found to be good hydroprocessing catalysts, particularly hydrotreating catalysts exhibiting a very high hydrodenitrogenation activity and/or selectivity in nitrogen and sulfur-containing hydrocarbon feeds.
摘要:
A class of bound catalysts which exhibit superior activity maintenance in dehydrocyclization reactions are defined as a type L zeolite having exchangeable cations of which at least 75% are selected from Group IA and calcium and barium cations and containing well dispersed particles of at least one Group VIII noble metal where at least 90% of the noble metal thereof is dispersed in the form of particles having a diameter less than 7 .ANG.. The catalysts may also be identified as type L zeolites loaded with at least one Group VIII noble metal which have a terminal cracking index (as a measure of production of pentanes versus butanes from hexane) of at least 1.5.
摘要:
A new catalyst system for alphaolefin type polymerizations, includes at least one hindered alkyl metal amide compound having the formula R'.sub.2 YNR.sub.2 in combination with a Group IVB-VIII transition metal compound on a support and at least one Lewis base wherein R is selected from the group consisting of C.sub.4 to C.sub.20 bulky alkyl, cycloalkyl, aralkyl, aryl and substituted aryl groups or R.sub.2 N is a hindered cyclic amide group; R' is selected from the group consisting of C.sub.1 to C.sub.20 primary alkyl, secondary alkyl, tertiary alkyl, neopentyl alkyl, branched alkyl, cycloalkyl or aralkyl groups, and Y is selected from the group consisting of aluminum, gallium or indium. The catalyst system provides polymers having increased isotactic stereoregularity as well as lower catalyst residue.
摘要:
A method of adhering a particulate material, such as a hydrocarbon adsorbent material and/or a catalytic material, to a plastic surface, and products comprising the adhered material are disclosed.
摘要:
A pre-vaporized fuel system for use in fueling an internal combustion engine is provided with a dynamic infrared sensor. The infrared sensor senses the hydrocarbon content of the vaporized fuel which information is used by the engine control module to control engine fueling to minimize emissions. The infrared source is operated to maintain the pre-vaporized fuel below its lower explosive limit and the thermopile detector electronics is synchronized with the light pulse frequency to develop fast signal responses suitable for fueling control.
摘要:
A catalyst composition comprising at least one first support, at least one first precious metal component, at least one second support, and at least one second precious metal component. The total amount of the first precious metal component comprises from 1 to 99 weight percent based on the total of the first and second precious metal components. The average particle size of the second support is greater than the average particle size of the first support. The present invention includes a method to prepare the catalyst composition and a method to use the catalyst composition as a three-way catalyst. The composition results in a coated layer from a slurry where the more supported first precious metal component is in the bottom half and more supported second precious metal component is in the top half.
摘要:
A method of improving the performance of a pollutant abatement means, e.g., catalytic converter (16), used to purify engine exhaust gas streams and the like includes combusting a combustion mixture of air and a low ignition temperature fuel in the exhaust gas stream upstream of the catalytic converter (16) to oxidize carbon monoxide and unburned hydrocarbons, and/or to rapidly heat the catalytic converter to its operating temperature. Reaction conditions are maintained so as to cause the combustion mixture to ignite spontaneously. A control system may be used to regulate the supply of the combustion mixture in response to time lapse or temperature of the catalyst or both. The apparatus includes a fuel supply (18) and a fuel line (20) controlled by a valve (22) to deliver a low ignition temperature fuel into the exhaust gas discharge line (14) associated with the engine (12). An air pump (26) provides combustion air through an air line (28) into the exhaust gas discharge line (14). Optionally, a thermocouple (36) attached to the catalytic converter (16) signals a controller (38) to reduce or stop the flow of air and/or low ignition temperature fuel in response to the temperature of the catalytic converter (16).
摘要:
A composition of matter comprising a mixture of (i) a sulfide of at least one promoter metal selected from the group consisting of Ni, Co, Mn, Cu, Zn and mixture thereof and mixtures thereof with Fe, (ii) an amorphous sulfide of trivalent chromium and (iii) microcrystallites of metal sulfide of a metal selected from the group consisting of molybdenum, tungsten and mixture thereof. These compositions have been found to be useful hydrotreating catalysts having nitrogen removal activity superior to that of commercial catalysts such as cobalt-molybdate on alumina.
摘要:
A process for producing relatively pure metal phosphorus trisulfides of the formula MPS.sub.3 wherein M is a metal selected from the group consisting of Mg, Ca, Sr, V, Mn, Fe, Co, Ni, Pd, Zn, Cd, Hg, Sn, Pb, Sm, Eu, Yb and mixtures thereof, said process comprising contacting in a reaction zone, phosphides of said metals of the formula M.sub.x P.sub.y, wherein the ratio of y/x ranges between 1/8 to 5/1, with one or more compounds of the formula PS.sub.z wherein z ranges from 1-3 and is preferably 2, said PS.sub.z being present in the reaction zone in an amount sufficient to exceed the amount of P and S stoichiometrically required to form the desired MPS.sub.3, at a temperature ranging from about 300.degree.-600.degree. C. and confined so as to maintain the PS.sub.z present in the reaction zone as a gas in equilibrium with its liquid for a time sufficient to produce said relatively pure metal phosphorus trisulfide.
摘要翻译:一种制备式MPS3的相对纯的金属磷三硫化物的方法,其中M是选自Mg,Ca,Sr,V,Mn,Fe,Co,Ni,Pd,Zn,Cd,Hg,Sn, Pb,Sm,Eu,Yb及其混合物,所述方法包括在反应区中接触所述式M x P y的金属的磷化物,其中y / x的比例在1/8至5/1之间,与一种或多种 式PSz的化合物,其中z为1-3,优选为2,所述PSz以足以超过形成所需MPS 3的化学计量所需的P和S的量存在于反应区中,温度范围为 约300℃-600℃,并限制在保持反应区中的PSz作为与其液体平衡的气体足以产生所述相对纯的金属磷三硫化物的时间。