摘要:
The invention relates to a photocatalyst comprising a β-SiC cellular foam and a photocatalytically active phase, deposited directly on said cellular foam or on an intermediate phase deposited on said cellular foam. The average size of the cells is between 2500 μm and 5000 μm. The foam can comprise nanotubes or nanofibers (particularly of carbon, SiC, and TiO2) that consist of, or carry as an intermediate phase, a photocatalytically active phase.
摘要:
A dehydrochlorination process is disclosed. The process involves contacting RfCHClCH2Cl with a carbon catalyst in a reaction zone to produce a product mixture comprising RfCCl═CH2, wherein Rf is a perfluorinated alkyl group.
摘要:
A catalyst precursor comprising (A) a microporous support; (B) a non-noble metal precursor; and (C) a pore-filler, wherein the micropores of the microporous support are filled with the pore-filler and the non-noble metal precursor so that the micropore surface area of the catalyst precursor is substantially smaller than the micropore surface area of the support when the pore-filler and the non-noble metal precursor are absent is provided. Also, a catalyst comprising the above catalyst precursor, wherein the catalyst precursor has been pyrolysed so that the micropore surface area of the catalyst is substantially larger than the micropore surface area of catalyst precursor, with the proviso that the pyrolysis is performed in the presence of a gas that is a nitrogen precursor when the microporous support, the non-noble metal precursor and the pore-filler are not nitrogen precursors is also provided. Methods of producing the catalyst precursor and the catalyst are provided.
摘要:
A composite catalyst is presented. The composite catalyst comprises a substrate. The substrate comprises a zeolite and an inorganic oxide. The composite further comprises a carbonaceous material disposed on a surface of the substrate. The carbonaceous material comprises greater than about 2.8 weight percent of the composite catalyst.
摘要:
In one preferred embodiment, a photocatalyst for conversion of carbon dioxide and water to a hydrocarbon and oxygen comprises at least one nanoparticulate metal or metal oxide material that is substantially free of a carbon coating, prepared by heating a metal-containing precursor compound in a sealed reactor under a pressure autogenically generated by dissociation of the precursor material in the sealed reactor at a temperature of at least about 600° C. to form a nanoparticulate carbon-coated metal or metal oxide material, and subsequently substantially removing the carbon coating. The precursor material comprises a solid, solvent-free salt comprising a metal ion and at least one thermally decomposable carbon- and oxygen-containing counter-ion, and the metal of the salt is selected from the group consisting of Mn, Ti, Sn, V, Fe, Zn, Zr, Mo, Nb, W, Eu, La, Ce, In, and Si.
摘要:
A process is provided for producing carbon microparticles, wherein resin microparticles, metal-containing resin microparticles or daughter-particle-containing resin microparticles are subjected to carbonization baking, and wherein the synthetic resin microparticles, the metal-containing resin microparticles or the daughter-particle-containing resin microparticles are produced by a process comprising mixing a polymer (A) such as polyacrylonitrile copolymer microparticles composed of a copolymer of an acrylonitrile monomer and a hydrophilic vinyl monomer with a polymer (B) that is different from the polymer (A) in an organic solvent to produce an emulsion and bringing the emulsion into contact with a poor solvent for the polymer (A), thereby causing the polymer (A) to precipitate; and the carbon microparticles.
摘要:
Disclosed is a process for producing light olefins from methanol or dimethyl ether. In the process, the fresh catalyst or the regenerated catalyst is pretreated to deposit a certain amount of coke onto its interior pore surface in advance, to reduce the generation of alkane and heavy olefins, so as to increase the selectivities to ethylene and propylene; and during the production of the light olefins, the pretreated catalyst is used for catalyzing the methanol or the dimethyl ether to produce light olefins. The process can achieve higher yields of ethylene and propylene.
摘要:
Disclosed are: a novel catalyst for the hydrolysis of cellulose, which does not require the use of a large quantity of sulfuric acid for the preparation thereof and from which sulfuric acid cannot be eluted; a novel catalyst for the hydrolysis of cellulose, which is not changed in structure even in hot water and therefore does not undergo the deterioration in activity; and a process for producing a cellulose hydrolysate, mainly including glucose, using any one of the aforementioned catalysts. Specifically disclosed are: a catalyst for the hydrolysis of cellulose, which comprises a porous carbon material having a specific surface area of 800 to 2500 m2/g inclusive and a phenolic hydroxy group content of 100 to 700 mmol/kg inclusive, such as a porous carbon material having such a structure that carbon is filled in pores of mesoporous silica that is used as a template; and a catalyst for the hydrolysis of cellulose or hemicellulose, which comprises the aforementioned porous carbon material and a transition metal belonging to Group 8 to Group 11 and supported on the porous carbon material.
摘要:
A dehydrochlorination process is disclosed. The process involves contacting RfCHClCH2Cl with a carbon catalyst in a reaction zone to produce a product mixture comprising RfCCl═CH2, wherein Rf is a perfluorinated alkyl group.
摘要:
An oxidation catalyst containing a carbon material prepared by calcining a transition metal compound and a nitrogen-containing organic substance, or a transition metal compound, a nitrogen-containing organic substance, and a carbon compound not containing nitrogen, the oxidation catalyst oxidizing CO and/or a hydrocarbon.