M/SBA-15(M=Cu、Fe、Cr)介孔分子筛的制备、表征及其催化NO+CO反应研究  

Synthesis,characterization,and catalytic performance of mesoporous M/SBA-15 (M=Cu,Cr,Fe) for NO+CO reaction

作　　者：薛君[1] 申力涛[1] 

机构地区：[1]山西省交通科学研究院,山西太原030006

出　　处：《工业催化》2013年第8期31-36,共6页Industrial Catalysis

基　　金：山西省交通厅科研计划(2011-1-9)资助项目

摘　　要：以介孔分子筛SBA-15为载体,采用浸渍法制备M/SBA-15(M=Cu、Fe、Cr)介孔分子筛催化剂。采用XRD、BET、FT-IR、H2-TPR和XPS等对样品进行分析表征,在固定床微型反应器中评价M/SBA-15(M=Cu、Fe、Cr)分子筛催化剂催化NO+CO的反应性能。结果表明,负载金属的SBA-15分子筛仍保持高度有序的二维六方介孔结构,比表面积和孔径略有减少,负载的活性金属组分在SBA-15分子筛表面具有较高的分散度。Cu/SBA-15、Cr/SBA-15和Fe/SBA-15催化剂对NO+CO反应体系均有一定活性,但由于活性金属自身的特性及其在载体表面负载量的差异,3种催化剂上呈现的NO还原活性不同,顺序为:Cr/SBA-15>Cu/SBA-15>Fe/SBA-15。Mesoporous molecular sieves M/SBA-15 （M = Cu, Cr, Fe） were prepared by the incipient wetness impregnation method. The catalysts were characterized by XRD, BET, XPS, and H2-TPR techniques. The catalytic activity of the catalysts for NO ＋ CO reaction was evaluated in a fixed bed reactor. The results showed that the hexagonal p6mm mesostructure of parent siliceous SBA-15 was maintained very well in M/SBA-15 （M = Cu, Cr, Fe） , and its BET surface area and averge pore diameter decreased a little. The active metal components loaded on the surface of SBA-15 molecular sieves had higher dispersion degree. The catalytic activity of the catalysts depended on the loading of M （ Cu, Cr, Fe）. Cr/SBA-15 catalyst had better performance than Cu/SBA-15 and Fe/SBA-15 catalysts at relatively higher temperatures due to the higher content of active chromium, while the better deNOx performance of Cu/SBA-15 at low-temperature was ascribed to its excellent redox properties.

关 键 词：催化化学 介孔分子筛 M SBA-15 CO＋NO反应 

分 类 号：O643.361[理学—物理化学] O643.36[理学—化学]