低碳化学与化工2024，Vol.49Issue(10)：20-29,10.DOI:10.12434/j.issn.2097-2547.20230393
低模板剂用量下Silicalite-1分子筛中介孔结构的调控及甲醇制丙烯反应性能研究
Study on regulation of mesoporous structures of Silicalite-1 molecular sieves under low template dosage and reaction performances in methanol to propene
摘要
Abstract
In order to solve the problems of high diffusion resistance and high synthesis cost of microporous Silicalite-1 molecular sieves,hierarchical Silicalite-1 molecular sieves were synthesized by seed induction method under low dosage of template agent(n(TPA+)∶n(Si)=0.01,TPA+is tetrapropylammonium ion).The molecular sieves were characterized by XRD,FT-IR and N2 adsorption/desorption,and their catalytic performances in methanol to propylene were studied.The results show that for the molecular sieves prepared by one stage crystallization,when the mass fraction of seed in synthesized gel is 10％and the molar ratio of sodium fluoride to Si is 0.8,the obtained molecular sieve(S-110-0.01-NH4F0.8)has an ideal structure,and its mesoporous pore capacity is 0.120 cm3/g.For the molecular sieve prepared by two-stage crystallization,when the crystallization time of the low-temperature phase is 6 h,the mass fraction of seed in synthesized gel is 10％,the molar ratio of urea to Si is 0.5,the obtained molecular sieve(SL-110-0.01-6-CH4N2O0.5)has an ideal structure,and its mesoporous pore capacity is 0.220 cm3/g.Under the reaction conditions of 450 ℃ and methanol mass space velocity of 5.53 h-1 for 30 min to 40 min,SL-110-0.01-6-CH4N2O0.5 exhibits relatively good catalytic performance with the propylene yield of 14.65％,m(propylene)∶m(ethylene)of 4.6 and the regeneration period of 2600 min.关键词
多级孔Silicalite-1分子筛/晶种/甲醇制丙烯Key words
hierarchical Silicalite-1 molecular sieves/seed/methanol to propene分类
化学化工引用本文复制引用
孟晓静,张阳,孟晓伟,黄慧邦,周亮旭,李敏,冯建..低模板剂用量下Silicalite-1分子筛中介孔结构的调控及甲醇制丙烯反应性能研究[J].低碳化学与化工,2024,49(10):20-29,10.基金项目
国家自然科学基金(22202026). （22202026）
