吴爽,许振冲,李俊,周明东,臧树良.TiO2对In-Ag-O/γ-Al2O3催化剂上CO选择性还原NO的改性研究[J].环境科学学报,2015,35(9):2745-2751
TiO2对In-Ag-O/γ-Al2O3催化剂上CO选择性还原NO的改性研究
- TiO2 doped In-Ag-O/γ-Al2O3 for selective catalytic reduction of NO with CO
- 基金项目：国家科技支撑计划项目(No.2012BAF03B00)
- 吴爽
- 1. 华东师范大学化学系, 上海 200062;2. 辽宁石油化工大学化学与材料科学学院, 抚顺 113001
- 许振冲
- 辽宁石油化工大学化学与材料科学学院, 抚顺 113001
- 李俊
- 辽宁大学稀散元素化学研究所, 沈阳 110036
- 周明东
- 辽宁石油化工大学化学与材料科学学院, 抚顺 113001
- 臧树良
- 辽宁石油化工大学化学与材料科学学院, 抚顺 113001
- 摘要：以TiO2、γ-Al2O3及TiO2-γ-Al2O3复合氧化物为载体,以In-Ag-O基为活性组分,采用等体积浸渍法制备了一系列In/Ag催化剂,通过XRD、BET、SEM、H2-TPR等技术手段对催化剂表面形态进行分析,并考察了催化剂对CO选择性还原NO的反应活性和载体中TiO2含量对催化性能的影响.结果表明,TiO2的添加促进了活性组分铟和银物种的分散,当TiO2的含量为载体的15%时制备的催化剂活性最高,合适的TiO2与γ-Al2O3配比使活性组分与载体之间发生了强烈的相互作用,由此提高了CO选择性还原NO的活性.
- Abstract：A series of In/Ag-based catalysts with In-Ag-O as the active components were prepared by impregnation method using TiO2, γ-Al2O3, and TiO2-γ-Al2O3 as the carriers. The micro-structure of the catalysts was fully characterized by XRD, BET, SEM, and H2-TPR technology. The catalytic activity of selective reduction of NO with CO, and the effect of TiO2 content on the catalytic performance were investigated. The results indicated that the addition of TiO2 promoted the dispersion of indium and silver species, whereas the optimal activity was obtained with 15 wt% TiO2 applied in the carrier. It was assumed that an appropriate ratio of TiO2 and γ-Al2O3 might induce a strong interaction between the active components and carriers, which may lead to an improvement of catalytic activity for selective reduction of NO with CO.
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