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论文类型：期刊论文

发表时间：2013-11-01

发表刊物：JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL

收录刊物：SCIE、EI

卷号：378

页面范围：115-123

ISSN号：1381-1169

关键字：Cu/Ti1-xCexO2; NO reduction; Propene; SCR; Lean burn condition

摘要：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.