摘要:
The challenge for the present invention is to provide a catalyst composition restrained from declining in performance over time in purifying an exhaust gas containing an organic compound and a silicon compound, a catalyst containing the catalyst composition, and a method for producing the catalyst. This challenge is solved by using a catalyst composition containing zeolite added to precious metal-carried alumina, and the silicon resistance of the catalyst is improved greatly. The amount of acid of the zeolite added is preferably in the range of 0.4 mmol·NH 3 /g to 1.5 mmol·NH 3 /g.
摘要:
The invention provides a catalyst for catalytic direct decomposition of nitrogen oxides contained in exhaust gases wherein fuel is supplied and subjected to combustion under periodic rich/lean conditions and the resulting exhaust gases are brought into contact therewith, which catalyst comprises:
(A) a first catalyst component comprising at least one metal selected from the group consisting of rhodium and palladium supported on zeolite; (B) a second catalyst component comprising at least one selected from the group consisting of
(a) ceria, (b) praseodymium oxide, and (c) a mixture and/or a composite oxide of oxides of at least two elements selected from the group consisting of cerium, zirconium, praseodymium, neodymium, terbium, samarium, gadolinium and lanthanum; and
(C) a third catalyst component comprising
(a) at least one selected from the group consisting of platinum, rhodium, palladium and oxides thereof, and (b) a carrier.
摘要:
A process for selectively producing adamantane or an analogue thereof with a production apparatus constituted of inexpensive materials, without adversely influencing the natural environment. The process comprises isomerizing a C10 or higher, tricyclic saturated hydrocarbon in the presence of a metal-supporting solid acid catalyst and is characterized by conducting the isomerization in the presence of water and/or an alcohol.
摘要:
There is provided a process for producing adamantane and analogues thereof, namely a hydrocarbon having an adamantane structure which process comprises isomerizing a tricyclic saturated hydrocarbon having ten or more carbon atoms in the presence of a catalyst in which one or two or more metals selected from among the metals belonging to group VIII in the Periodic Table (group 8 to 10 in the new Periodic Table) are supported on zeolite by means of an ion exchange method. It is made possible by the above process to efficiently produce adamantane and analogues thereof in the presence of a solid catalyst without the use of hydrogen chloride.
摘要:
A process, preferably in a counter-current configuration, for selectively cracking carbon-carbon bonds of naphthenic species using a low acidic catalyst, preferably having a crystalline molecular sieve component and carrying a Group VIII noble metal. The diesel fuel products are higher in cetane number and diesel yield.
摘要:
A catalyst material for purifying exhaust gases from an automobile engine comprises a porous support material having a pore diameter between 0.7 and 20.0 nm and catalytic metals in the form of a mixture of a noble metal and a IIa group metal which is dispersed in and supported by the porous support material.
摘要:
A method is disclosed for preparing crystalline aluminosilicate Y zeolite from a reaction mixture containing only sufficient water to produce Y zeolite. In one embodiment, the reaction mixture is self-supporting and may be shaped if desired. In the method, the reaction mixture is heated at crystallization conditions and in the absence of an added external liquid phase, so that excess liquid need not be removed from the crystallized product prior to drying the crystals.
摘要:
A hydrocarbon conversion process wherein austenitic stainless steel portions that are subject to halide stress-corrosion cracking conditions, such as the colder portions of the process equipment including effluent coolers, knockout drums, accumulation drums, and piping low points, are provided with a protective layer having improved halide stress-corrosion cracking resistance. The method comprises applying a metal cladding, plating, paint or other coating to a stressed portion of austenitic stainless steel hydrocarbon conversion process equipment, optionally curing the coated steel to form intermetallic compounds to protect the steel portions; converting hydrocarbons utilizing a halided catalyst or under conditions where a halogen-containing compound is added or evolved or both; and subjecting the protected steel portion to halide stress-corrosion cracking conditions. A preferred coating material comprises tin, and preferably one or more intermetallic layers are provided to at least a portion of an austenitic stainless steel substrate to improve its stress-corrosion cracking resistance.
摘要:
A catalyst and process are described which are particularly effective in the dehydrogenation of one or more C3 to C6 saturated hydrocarbons. The catalyst, made by a simplified preparation process, is a platinum-loaded aluminosilicate molecular sieve exhibiting the MFI structure. The supported or unsupported catalyst when used to dehydrogenate alkanes is long-lived; it also has an excellent conversion and selectivity to the corresponding olefin while exhibiting minimal coking.