摘要
研究了不同条件下合成的 TS-1分子筛催化剂的环氧化性能。结果表明 ,当n(Si O2 ) /n(Ti O2 )为 3 5～ 45 ,n(OH- ) /n(Si O2 )为 0 .2时 ,合成的 TS-1分子筛具有最高的催化活性和选择性。在分子筛合成前体中 ,添加少量四乙基溴化铵 (TEABr)模板剂可大幅度提高分子筛的结晶产率和对环氧丙烷 (PO)的选择性及活性。循环利用母液中的残留模板剂 ,可以有效地降低四丙基氢氧化铵 (TPAOH)模板剂的消耗 ,所合成的 TS-1分子筛也具有较高的催化活性和选择性。 PO选择性降低是由于分子筛骨架中存在酸性锐钛矿杂晶相引起的。用碱金属离子的醋酸盐交换处理可以有效地提高催化剂的选择性。
TS 1 zeolites suitable for catalyzing epoxidation of propylene have been prepared Studies showed that optimum n (SiO 2)/ n (TiO 2) of synthesized zeolite is about 35～45 and optimum n (OH -)/ n (SiO 2) is about 0 2 Addition of small amount of TEABr can improve the catalytic activity and the selectivity to PO Template containing mother liquor obtained after crystallization can be recycled to prepare efficient titanium silicalites catalyst and thus reduce the amount of TPAOH used greatly The decrease of selectivity to PO resuled from the presence of acidic extra framework anatase in zeolite However,the selectivity to PO of the used catalyst can be restored almost completely after the catalyst is treated with a dilute solution of NaAc
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2000年第3期79-84,共6页
Acta Petrolei Sinica(Petroleum Processing Section)
关键词
TS-1
分子筛
环氧丙烷
丙烯
氧化
titanium silicalites
propylene oxide
template
selectivity
