文献类型：期刊文献

英文题名：The Synthesis of Hierarchical SAPO-34 and its Enhanced Catalytic Performance in Chloromethane Conversion to Light Olefins

作者：Kong, Lingtao[1];Jiang, Zhang[1];Zhao, Jigang[1];Liu, Jichang[1];Shen, Benxian[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2014

卷号：144

期号：9

起止页码：1609

外文期刊名：CATALYSIS LETTERS

收录：;EI(收录号：20143518119115);WOS:【SCI-EXPANDED(收录号:WOS:000340928800018)】；

语种：英文

外文关键词：Hierarchical SAPO-34; Cetyltrimethyl ammonium bromide; Chloromethane; Light olefins

摘要：Hierarchical SAPO-34 molecular sieve was successfully synthesized by hydrothermal crystallization method with cetyltrimethyl ammonium bromide as mesoporous generating agent. The influence of different addition amounts of CTAB on the crystalline structures, morphology features, textural properties and acidity of hierarchical SAPO-34 catalysts were characterized by XRD, SEM, BET and NH3-TPD techniques. The results exhibit that the crystal size, mesoporous structure and the total acid amounts of hierarchical SAPO-34 are affected greatly by the molar ratio of CTAB/Al2O3. The selectivity of light olefins (ethane and propylene) can achieve 80 % for all SAPO-34 samples tested in the conversion of chloromethane to light olefins. Compared with the conventional SAPO-34, the hierarchical SAPO-34 samples show better catalytic stability and less carbon deposit in this conversion due to the reduction in total acid sites and the increasing mesopore volume.