摘要:
Catalyst articles having a first zone containing a first SCR catalyst and a second zone containing an ammonia slip catalyst (ASC), where the ammonia slip catalyst contains a second SCR catalyst and an oxidation catalyst, and the ASC has DOC functionality, where the first zone is located on the inlet side of the substrate and the second zone is located in the outlet side of the substrate are disclosed. The catalytic articles are useful for selective catalytic reduction (SCR) of NOx in exhaust gases, in reducing the amount of ammonia slip and in oxidizing organic residues. Exhaust systems containing the catalyst articles and methods of using the catalytic articles in an SCR process, where the amount of ammonia slip is reduced and hydrocarbon are oxidized by the ASC catalyst, are also described.
摘要:
A catalyst comprising palladium, bismuth, and at least one third element X selected from the group consisting of P, S, Sc, V, Ga, Se, Y, Nb, Mo, La, Ce, and Nd, wherein the catalyst further comprises a support.
摘要:
A catalyst comprising palladium, bismuth, and at least one third element X selected from the group consisting of P, S, Sc, V, Ga, Se, Y, Nb, Mo, La, Ce, and Nd, wherein the catalyst further comprises a support.
摘要:
Exemplary embodiments of the invention provide a process of increasing the cetane number rating of a diesel oil feedstock. The process involves reacting a diesel fuel feedstock in liquid form with ozone in gaseous form in the presence of an alcohol having two or more carbon atoms and at least one polar solvent different from the alcohol, thereby forming an ozonated diesel oil containing oxidized byproducts, wherein the alcohol and said polar solvent are employed in amounts totaling no more than about 10 vol. % of the feedstock. The oxidized byproducts are then separated from the ozontated diesel oil to produce a hydrocarbon product of increased cetane number rating relative to the feedstock oil. The product can be used as a diesel fuel or as a diesel fuel extender mixed with conventional diesel fuel of low cetane number.
摘要:
Novel catalysts, substantially free of Cu and Zn, useful for the reformation of methanol and steam into H2 for use in hydrogen fuel cells and their use are described herein.
摘要:
Hydrogenated liquid organic compounds are used for storage and supply of hydrogen at near ambient conditions. The hydrogen is released from the hydrogenated liquid organic compounds through a catalytic dehydrogenation reaction using a M/support or M-M′/support catalyst. The M/support catalyst comprises a metal M selected from Pt, Pd, Rh, Ru, Ir, Os, or combination thereof, and a support selected from Y2O3 or V2O5 or combinations thereof. The M-M′/support catalyst comprises a first metal M selected from Cu, Ag, Au, or combination thereof, a second metal M′ selected from Pt, Pd, Rh, Ru, Ir, Os, Fe, Ni, Re, Mo, W, V, Cr, Co or combinations thereof, and a support selected from activated carbon, alumina, alumite, zirconia, silica or combination thereof. Synergistic effects are created by using the combination of the M and M′ in the catalyst, which result in shifting of the equilibrium of the reaction favorably to dehydrogenation.
摘要翻译:氢化液体有机化合物用于在接近环境条件下储存和供应氢气。 通过使用M /载体或M-M'/载体催化剂的催化脱氢反应,氢从氢化液体有机化合物中释放出来。 M /载体催化剂包括选自Pt,Pd,Rh,Ru,Ir,Os或其组合的金属M,以及选自Y 2 O 3或V 2 O 5的载体或其组合。 M-M'/载体催化剂包括选自Cu,Ag,Au或其组合的第一金属M,选自Pt,Pd,Rh,Ru,Ir,Os,Fe,Ni,Re, Mo,W,V,Cr,Co或其组合,以及选自活性炭,氧化铝,耐酸铝,氧化锆,二氧化硅或其组合的载体。 通过在催化剂中使用M和M'的组合产生协同效应,这导致反应平衡有利地转化为脱氢。
摘要:
The present invention relates to a process for restoring the activity of spent catalysts for the hydrogenation of aromatic nitro compounds, in which a regeneration comprising at least a first burning off stage, a first washing stage, a second burning off stage and a second washing stage is carried out at periodic intervals.
摘要:
Structural catalyst bodies are described herein which, in some embodiments, can be used in the treatment of nitrogen oxides present in exhaust or flue gases from stationary or mobile combustion sources. In some embodiments, a structural catalyst body described herein comprises an outer peripheral wall and a plurality of inner partition walls having an average thickness less than about 0.5 mm, the outer peripheral wall and the inner partition walls having dispersed throughout a chemical composition comprising 50-99.9% by weight an inorganic oxide composition, less than 3% by weight an inorganic extrusion aid and at least 0.1% by weight a catalytically active metal functional group comprising vanadium, the structural catalyst body having a crystalline vanadium pentoxide content less than 0.1 weight percent.
摘要:
A catalytic system for CO removal includes a gold (Au) catalyst and a co-catalyst in contact with an aqueous phase, and a fuel cell system using the same. The catalytic system is relatively very simple compared to a common CO removal system, and can highly efficiently remove CO at low temperature without side reaction. In addition, water contacted in the catalytic system can act as a buffer for the rise and fall of temperature, and thus, can cope with an accidental temperature change. Further, the catalytic system shows a low operation temperature, and thus, can be operated over a broad operation range considering the activity and/or selectivity of the gold catalyst, etc.