期刊
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
卷 378, 期 -, 页码 115-123出版社
ELSEVIER
DOI: 10.1016/j.molcata.2013.06.005
关键词
Cu/Ti1-xCexO2; NO reduction; Propene; SCR; Lean burn condition
资金
- National Nature Science Foundation of China [20877013, NSFC-RGC 21061160495]
- National High Technology Research and Development Program of China (863 Program) [2010AA064902]
- Major State Basic Research Development Program of China (973 Program) [2007CB613306]
- Excellent Talents Program of Liaoning Provincial University [LR2010090]
- China's One Thousand Chinese Talents Award
- Australia Research Council under the Linkage Project Scheme with Fuel Technology Pty Ltd [LP0989368]
- BHPBilliton Iron Ore Pty Ltd. as the partner organizations
A series of Cu-supported Ti-Ce mixed oxide catalysts (Cu/Ti1-xCexO2), with x = 0, 0.1, 0.2, 0.3, 0.5, 1.0, were evaluated for selective catalytic reduction (SCR) of NO with C3 H6 under lean-burn conditions, and the promotional effect of ceria additive was investigated systematically. Among the tested catalysts, Cu/Ti0.9Ce0.1O2 exhibited excellent low-temperature activity, which achieved a maximum N-2 yield of 50.3% and NO conversion of 66.2% at 240 degrees C. The generation of Ti-O-Ce mixed bond raised the quantity of Lewis acid sites and therefore improved the distribution of the copper oxide species on the catalyst surface. The high SCR activity of the Cu/Ti1-xCexO2 was mainly attributed to the abundant Lewis acid sites and the high ratio of adsorbed oxygen on the catalyst surface, which provided more adsorption centers for NO and promoted the NO oxidation in the SCR reaction. Furthermore, the high concentration of Cu2+ was beneficial to NO adsorption. Combined with the in situ FT-IR results, it was suggested that the synergistic effect of ceria and copper promoted the formation and reactivity of nitrates, oxygenated hydrocarbons, and key intermediates isocyanate (-NCO species), and consequently, Cu/Ti0.9Ce0.1O2 catalyst exhibited the excellent SCR performance. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.
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