摘要:
The present invention relates to a catalyst for hydrocarbon steam cracking, a method of preparing the same, and a method of preparing olefin by the hydrocarbon steam cracking by using the catalyst, and more specifically, to a catalyst for hydrocarbon steam cracking for preparing light olefin including an oxide catalyst (0.51≦j≦120, 1≦k≦50, A is transition metal, and x is a number satisfying conditions according to valence of Cr, Zr, and A and values of j and k) represented by CrZrjAkOx, wherein the composite catalyst is a type that has an outer radius r2 of 0.5R to 0.96R (where R is a radius of a cracking reaction tube), a thickness (t; r2−r1) of 2 to 6 mm, and a length h of 0.5r2 to 10r2, a method of preparing the same, and a method of preparing light olefin by using the same.
摘要:
The present invention provides monolithic structural catalysts. The catalysts have a high open frontal area structure and composition advantageous for use in high particulate matter environments such as coal-fired industrial applications. In an embodiment, the present invention provides a monolithic structural catalyst body comprising a high open frontal area structure and composition that can achieve an efficient selective reduction of nitrogen oxides while minimizing the oxidation of sulfur dioxide wherein the structure of the catalyst body is resistant to plugging by particulate matter.
摘要:
The present invention relates to spherical agglomerates based on zeolite(s) and clay(s), having controlled size and morphology, in particular a size of less than or equal to 600 μm, very good sphericity, high content of zeolitic material,and their production process.These agglomerates are particularly suitable for uses in gaseous and/or liquid-phase adsorption processes.
摘要:
A fast light off flow-through ceramic substrate is provided that is particularly adapted for use as a catalytic converter. The substrate is formed from a body of ceramic material having axially opposing inlet and outlet ends for receiving and expelling the flow of automotive exhaust gas, respectively. The body contains a network of walls coated with a catalyst that define axially-oriented flow-through cell channels. The average thermal mass (ATM1) of a first axial region of the walls adjacent to the inlet end is at least 20% less than the average thermal mass (ATMTOT) of all of the walls. The lower average thermal mass of the walls in the first region advantageously shortens the light off time for the catalyst within the substrate to effectively neutralize automotive pollutants. The reduction of the average thermal mass in only the first axial region of the walls advantageously maintains the strength of the resulting body of ceramic material, and further increases the cool down time of the body.
摘要:
The invention provides processes for generating a methane-enriched gas from a gas mixture comprising carbon monoxide and hydrogen such as gas streams generated by gasification of an alkali metal catalyst-loaded carbonaceous feedstock, and a char methanation catalyst useful in such processes.
摘要:
Compositions and methods for the manufacture of electrodes for fuel cells. The compositions and methods are particularly useful for the manufacture of anodes and cathodes for proton exchange membrane fuel cells, particularly direct methanol fuel cells. The methods can utilize direct-write tools to deposit ink compositions and form functional layers of a membrane electrode assembly having controlled properties and enhanced performance.
摘要:
A process for the preparation of a catalyst, which process comprises the steps of: i) mixing an alumina precursor with combustible carbon-containing fibers with a diameter in the range of from 0.5 to 5 μm and a length of no greater than 100 μm in an amount in the range of from 20 to 40 wt % based on the total dry mixture; ii) adding nitric acid and water to form an extrudable mass; iii) extruding the mixture to form shaped particles; iv) drying the shaped particles; v) heating the particles in an atmosphere comprising no more than 5 vol % oxygen at a temperature in the range of from 350 to 600° C.; and vi) then heating the particles in a gas mixture comprising at least 12 vol % oxygen at a temperature in the range of from 450 to 600° C.
摘要:
The present invention discloses a catalyst, system, and process for oxidizing mercury. The catalyst can include a substrate and a layer attached to at least part of the substrate. The layer contains a noble metal and has an average thickness of less than 100 nanometers. The substrate can be a plurality of glass fibers that provides for a relatively high surface area for the layer to be attached to. In the alternative, the substrate can be a porous substrate that provides for a high surface area for the layer to be attached to.
摘要:
The present invention addresses at least four different aspects relating to catalyst structure, methods of making those catalysts and methods of using those catalysts for making alkenyl alkanoates. Separately or together in combination, the various aspects of the invention are directed at improving the production of alkenyl alkanoates and VA in particular, including reduction of by-products and improved production efficiency. A first aspect of the present invention pertains to a unique palladium/gold catalyst or pre-catalyst (optionally calcined) that includes rhodium or another metal. A second aspect pertains to a palladium/gold catalyst or pre-catalyst that is based on a layered support material where one layer of the support material is substantially free of catalytic components. A third aspect pertains to a palladium/gold catalyst or pre-catalyst on a zirconia containing support material. A fourth aspect pertains to a palladium/gold catalyst or pre-catalyst that is produced from substantially chloride free catalytic components.
摘要:
The present invention provides a catalyst precursor for producing maleic anhydride by oxidizing butane. Said catalyst precursor is prepared by a process comprising partially reducing V+5 to V+4 in a mixture of alcohols consisting of isobutanol and benzyl alcohol in a volume ratio of 2.5-5.0, then adding a phosphoric oxy-acid and an alkylsilicon in turn. The catalyst precursor prepared according to said process has a small pore volume, a relatively high bulk density in an appropriate pore size distribution.