文献类型：期刊文献

英文题名：A highly effective catalyst of Co-CeO2 for the oxidation of diesel soot: The excellent NO oxidation activity and NOx storage capacity

作者：Xu, Jianan;Lu, Guanzhong[1];Guo, Yun;Guo, Yanglong;Gong, Xue-Qing

机构：[1]East China Univ Sci & Technol, Key Lab Adv Mat & Res Inst, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China; East China Univ Sci & Technol, Sch Chem & Mol Engn, Res Inst Ind Catalysis, Shanghai 200237, Peoples R China

年份：2017

卷号：535

起止页码：1

外文期刊名：APPLIED CATALYSIS A-GENERAL

收录：;EI(收录号：20170703347614);WOS:【SCI-EXPANDED(收录号:WOS:000397365100001)】；

基金：This work was supported financially by the National Key Research and Development Program of China (2016YFC0204300), the National Natural Science Foundation of China (21577034, 21333003), the Commission of Science and Technology of Shanghai Municipality (15DZ1205305) and the Fundamental Research Funds for the Central Universities (WJ1514020).

语种：英文

外文关键词：Co-CeO2 mixed oxide; NO2-assistance; Soot oxidation; NO oxidation; NOx storage

摘要：In the catalytic combustion of diesel soot, the role of NO in the exhaust emission and the simultaneous reduction of NO by soot are two fascinating problems. Herein, the Co-CeO2 catalyst prepared by the citrate acid sol-gel method was developed to catalyze the NOx-assisted soot oxidation. The effect of the Co amount on the physicochemical and catalytic properties of the Co-CeO2 catalysts was investigated in detail. When the molar ratio of Co/Ce was 50/50, the Co50Ce50 mixed oxide catalyst exhibited the lowest soot oxidation temperature (T-m of 335 degrees C) in the feed gas of NO + 02, and the presence of water can improve obviously the catalytic combustion of soot with Tm of 310 C. The presence of Co can improve the reduction of surface oxygen of ceria, and Ce can promote the reduction of Co3O4 to CoO, resulting in the enhancement of the catalytic activity of Co-CeO2 for NO oxidation and its capacity for NO2 storage as the surface nitrates. The soot oxidation on the Co-CeO2 catalyst can be promoted by "NO2-assistance": the nitrate species are preferentially formed on the Co active sites and stored on the catalyst surface, and then NO2 produced by NO oxidation and the decomposition of nitrate stored on the surface at lower temperature, reacts with soot. That is, the stored NO, species initiates the beginning of soot oxidation, and the NO oxidation ability of the catalyst is responsible for the extensive soot oxidation by NO+O-2, in which NO is reduced by carbon in soot combustion. The combination of high NO oxidation activity and high NO2 storage capacity makes the CosoCeso oxide catalyst as an efficient catalyst for the NOx-assisted soot oxidation. (C) 2017 Elsevier B.V. All rights reserved.