Mesoporous SBA-15 materials modified with PW or W active species as catalysts for the epoxidation of olefins with H2O2
作者:Aiping Zhang、Yi Zhang、Puguang Wang、Jun Li、Ying Lv、Shuang Gao
DOI:10.1007/s11164-011-0304-0
日期:2011.10
Five catalysts containing PW or W active species that anchored onto aminosilylated mesoporous silica SBA-15 by a post-grafting route were prepared and the resulting PW or W/APTES/SBA-15 hybrid materials were characterized by XRD, N2 adsorption/desorption, surface area analysis, TEM, FT-IR, and ICP (inductively coupled plasma atomic emission spectroscopy). The names of these catalysts have been abbreviated as SBA-15m-a, SBA-15m-b, SBA-15m-c, SBA-15m-d, and SBA-15m-e according to the different active species. The PW or W active species were highly dispersed in the channels of the modified mesoporous materials. The interaction between PW or W species and amino groups grafted on the channel surface of SBA-15 led to the immobilization of PW or W species. Their catalytic activity in the epoxidation of cyclooctene with H2O2 as oxidant was investigated. Among them, SBA-15m-a showed the best performance, with 98.9% conversion and 98.4% selectivity. The catalyst could be reused for six times with a little decrease in activity.
通过后嫁接法将含PW或W活性物种的五种催化剂固定在氨基硅烷化介孔二氧化硅SBA-15上,所得PW或W/APTES/SBA-15复合材料通过XRD、N2吸附/解吸、比表面积分析、TEM、FT-IR和ICP(电感耦合等离子体原子发射光谱)进行表征。根据不同的活性物种,这些催化剂的名称缩写为SBA-15m-a、SBA-15m-b、SBA-15m-c、SBA-15m-d和SBA-15m-e。PW或W活性物种在改性介孔材料的通道中高度分散。PW或W物种与SBA-15通道表面嫁接的氨基之间的相互作用导致PW或W物种的固定化。研究了它们在以H2O2为氧化剂的环辛烯环氧化反应中的催化活性。其中,SBA-15m-a表现出最佳性能,转化率为98.9%,选择性为98.4%。该催化剂可重复使用六次,活性略有下降。