Lean NOx reduction with CO + H2 mixtures over Pt/Al2O3 and Pd/Al2O3 catalysts
作者： Norman Macleod , Richard M. Lambert
DOI: 10.1016/S0926-3373(01)00264-8
关键词: Hydrogen 、 Nanotechnology 、 Exhaust gas 、 Adsorption 、 Platinum 、 NOx 、 Carbon monoxide 、 Chemistry 、 Inorganic chemistry 、 Lean burn 、 Catalysis
摘要: Abstract The reduction of NOx by hydrogen under lean burn conditions over Pt/Al2O3 is strongly poisoned carbon monoxide. This due to the strong adsorption and subsequent high coverage CO, which significantly increases temperature required initiate reaction. Even relatively small concentrations CO dramatically reduce maximum conversions achievable. In contrast, presence has a pronounced promoting influence in case Pd/Al2O3. this case, although pure H2 are ineffective for conditions, H2/CO mixtures very effective. With realistic (1:3) H2:CO ratio, typical actual exhaust gas, Pd/Al2O3 more active than Pt/Al2O3, delivering 45% conversion at 160 °C, compared >15% identical conditions. nature support also critically important, with being much Pd/SiO2. Possible mechanisms improved performance H2+CO discussed.
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sci-hub.se 参考文章(41)
C.N Costa, V.N Stathopoulos, V.C Belessi, A.M Efstathiou, An Investigation of the NO/H2/O2 (Lean-deNOx) Reaction on a Highly Active and Selective Pt/La0.5Ce0.5MnO3 Catalyst Journal of Catalysis. ,vol. 197, pp. 350- 364 ,(2001) , 10.1006/JCAT.2000.3101
R.K. Usmen, R.W. McCabe, M. Shelef, Metal surface area measurement of fresh and aged automotive catalysts by CO methanation Catalysis and Automotive Pollution Control III, Proceedings of the Third International Symposium CAPoC 3. ,vol. 96, pp. 789- 799 ,(1995) , 10.1016/S0167-2991(06)81475-8
William C Hecker, Alexis T Bell, Reduction of NO by CO over silica-supported rhodium: Infrared and kinetic studies Journal of Catalysis. ,vol. 84, pp. 200- 215 ,(1983) , 10.1016/0021-9517(83)90098-2
Ralf Dümpelmann, Noel W. Cant, David L. Trimm, The Formation of Isocyanic Acid (HNCO) by Reaction of NO, CO, and H2over Pt/SiO2and Its Hydrolysis on Alumina Journal of Catalysis. ,vol. 162, pp. 96- 103 ,(1996) , 10.1006/JCAT.1996.0263
R. J. H. VOORHOEVE, L. E. TRIMBLE, Synthesis of Isocyanic Acid from Nitric Oxide over Palladium and Iridium Catalysts. Science. ,vol. 202, pp. 525- 526 ,(1978) , 10.1126/SCIENCE.202.4367.525
Ronald M Heck, Catalytic abatement of nitrogen oxides–stationary applications Catalysis Today. ,vol. 53, pp. 519- 523 ,(1999) , 10.1016/S0920-5861(99)00139-X
Ralf D�mpelmann, Noel W. Cant, David L. Trimm, The positive effect of hydrogen on the reaction of nitric oxide with carbon monoxide over platinum and rhodium catalysts Catalysis Letters. ,vol. 32, pp. 357- 369 ,(1995) , 10.1007/BF00813230
R Burch, An investigation of the NO/H2/O2 reaction on noble-metal catalysts at low temperatures under lean-burn conditions Applied Catalysis B-environmental. ,vol. 23, pp. 115- 121 ,(1999) , 10.1016/S0926-3373(99)00073-9
Gregory T. Went, Li-Jen Leu, Richard R. Rosin, Alexis T. Bell, The effects of structure on the catalytic activity and selectivity of V2O5/TiO2 for the reduction of NO by NH3 Journal of Catalysis. ,vol. 134, pp. 492- 505 ,(1992) , 10.1016/0021-9517(92)90337-H
S.H. Oh, R.M. Sinkevitch, Carbon Monoxide Removal from Hydrogen-Rich Fuel Cell Feedstreams by Selective Catalytic Oxidation Journal of Catalysis. ,vol. 142, pp. 254- 262 ,(1993) , 10.1006/JCAT.1993.1205