李新勇

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教授

博士生导师

硕士生导师

性别:男

毕业院校:中国科学院兰州化学物理研究所

学位:博士

所在单位:环境学院

办公地点:环境楼 B415

联系方式:Tel: 0411-84706658

电子邮箱:xyli@dlut.edu.cn

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Structure sensitivity of selective catalytic reduction of NO with propylene over Cu-doped Ti0.5Zr0.5O2-delta catalysts

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论文类型:期刊论文

发表时间:2015-04-01

发表刊物:APPLIED CATALYSIS B-ENVIRONMENTAL

收录刊物:SCIE、EI、Scopus

卷号:165

页面范围:519-528

ISSN号:0926-3373

关键字:Cu-doped Ti0.5Zr0.5O2-delta; Hierarchical morphology; In situ DRIFTS; Selective catalytic reduction; Structure sensitive

摘要:The structure sensitivity of selective catalytic reduction (SCR) of NO with propylene over Cu-doped Ti0.5Zr0.5O2-delta catalysts was investigated systematically in a series of characterizations and in situ DRIFT spectroscopy. A Cu-doped Ti0.5Zr0.5O2-delta catalyst with a hierarchical structure was fabricated successfully using a hydrothermal method (Hy-Sample), and shown to exhibit excellent SCR performance with high reaction rate and turnover frequency (TOF). The physico-chemical properties, mass transfer, and SCR activity of the catalyst depended on the preparation method. Another sample of Cu-doped Ti0.5Zr0.5O2-delta catalyst prepared using a co-precipitation method (Co-Sample) exhibited a disordered, irregular morphology, whose SCR activity, as determined in a fixed bed reactor, was significantly lower than that of Hy-Sample. In comparison, Hy-Sample possessed an enhanced redox property, and its highly ordered morphology greatly promoted the generation of active sites, including the fine-dispersed CuO species and surface adsorbed oxygen. Consequently, NO and C-3 H-6 were readily adsorbed and activated over Hy-Sample and induced the formation of important intermediates with high reactivity, such as isocyanate (-NCO) and cyanide (-CN) species. However, the activation capacity of Co-Sample toward reactants was very weak, and the sequential deficiency of N-containing organics could be the primary reason for the poor SCR activity of Co-Sample. (C) 2014 Elsevier B.V \All rights reserved.