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

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。

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

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.