摘要
钛硅分子筛ＴＳ１在有稀双氧水（３０％）参与的多种有机化合物选择氧化反应中具有优异的催化性能，因而被认为是分子筛研究领域的一个里程碑［１］．但由于其拓扑结构所限，ＴＳ１孔道尺寸只有０５５ｎｍ左右，动力学直径大于０６ｎｍ的有机物分子难以扩散进入其...
Ti zeolites have been prepared successfully by gassolid interaction using dealuminated as precursors which were well characterized by XRD, FTIR and UVVis techniques. FTIR spectra show that, as compared with that of precursors, the 960 cm-1 band of Ti zeolites becomes more intense, which is assigned to the incorporation of Ti atoms in the framework. UVVis spectra of Ti exhibit a strong transition at 210 nm, indicating that Ti atoms are tetrahedrally incorporated into the framework. With increasing dealumination of the precursors, the amount of extraframework TiO2 in the Ti zeolites gradually decreases. The results of epoxidation of olefins over Ti zeolites show that Ti zeolites occupy better catalytic performance for epoxidation of cyclohexene than TS1.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
1999年第4期467-470,共4页
基金
国家自然科学基金
中国石油化工总公司资助
关键词
脱铝沸石
Ti-β沸石
烯烃
环氧化
催化剂
沸石
dealuminated zeolite, Ti zeolite, gassolid interaction, olefin, epoxidation
