Vanadia-modified Sb–CeO2/TiO2 catalyst for effective removal of NO by NH3
Vanadia-modified Sb–CeO2/TiO2 catalyst for effective removal of NO by NH3
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DOI：
10.1007/s11164-013-1376-9
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发表时间：
2015-04
影响因子：
3.3
通讯作者：
K. Lee;M. Maqbool;A. K. Pullur;Y. Jeong;K. Song;H. Ha
中科院分区：
文献类型：
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作者：
K. Lee;M. Maqbool;A. K. Pullur;Y. Jeong;K. Song;H. Ha
系统研究了不同钒负载量(0~3%w/w)的Sb-CeO2/TiO2(SCT)催化体系对NH3脱除NO的催化性能。采用BET比表面积、X射线衍射、X射线光电子能谱、程序升温脱附(NH3和SO2-TPD)、程序升温还原(H2-TPR)和原位漂移等方法对浸渍沉淀法制备的一系列催化剂进行了物理表征。NH3-TPD和H2-TPR结果表明，2%和3%钒负载的Sb-CeO2/TiO2催化剂具有较高的总酸和还原能力。因此，两种催化剂在低温下都具有较高的活性。在240℃下反应20h，负载2%钒的Sb-CeO2/TiO2催化剂比负载3%钒的催化剂具有更好的抗SO2性能。此外，原位SO2DRIFT研究表明，Sb-CeO2/TiO2催化剂表面硫酸盐物种比负载钒的Sb-CeO2/TiO2催化剂上的硫酸盐物种多。
The Sb–CeO2/TiO2(SCT) catalytic system with different vanadia loading (0–3 %w/w) was systematically investigated for removal of NO by NH3. A series of catalysts prepared by impregnation and deposition precipitation methods were thoroughly characterized physically, by BET surface area, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), and chemically, by temperature-programmed desorption (NH3and SO2-TPD), temperature programmed reduction (H2-TPR), and in-situ DRIFT study. NH3-TPD and H2-TPR results for 2 and 3 % vanadia-loaded Sb–CeO2/TiO2catalysts revealed high total acidity and reducibility. As a result, both catalysts had high activity at low temperatures. At 240 °C for 20 h the 2 % vanadia-loaded Sb–CeO2/TiO2catalyst was more resistant to SO2than the 3 % vanadia catalyst. In addition, in-situ SO2DRIFT study revealed the existence of more surface sulfate species on Sb–CeO2/TiO2than on vanadia-loaded Sb–CeO2/TiO2catalysts.