文献类型：期刊文献

英文题名：Synthesis of SAPO-34 with the presence of additives and their catalytic performance in the transformation of chloromethane to olefins

作者：Kong, Ling-tao[1];Shen, Ben-xian[1];Jiang, Zhang[1];Zhao, Ji-gang[1];Liu, Ji-chang[1]

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

年份：2015

卷号：114

期号：2

起止页码：697

外文期刊名：REACTION KINETICS MECHANISMS AND CATALYSIS

收录：;EI(收录号：20153101094034);WOS:【SCI-EXPANDED(收录号:WOS:000351177700024)】；

语种：英文

外文关键词：SAPO-34; Soluble starch; Sodium dodecyl sulfate; Cetyltrimethylammonium bromide; Chloromethane; Light olefins

摘要：SAPO-34 molecular sieves were synthesized in the presence of soluble starch, sodium dodecyl sulfate and cetyltrimethylammonium bromide as the additives under hydrothermal conditions, and the differences stemmed from the additives among all obtained SAPO-34 samples were characterized by XRD, SEM, BET, NH3-TPD and TG. Compared with the conventional SAPO-34 sample, the SAPO-34 samples modified by sodium dodecyl sulfate and cetyltrimethylammonium bromide showed less crystalline order, enlarged mesopore volume and external surface area and a reduction in total acidity amounts. Meanwhile, the SAPO-34 modified by soluble starch exhibited more total acidity amounts than the conventional SAPO-34 samples. The SAPO-34 samples modified by sodium dodecyl sulfate and cetyltrimethylammonium bromide showed better catalytic stability and less carbon deposition than the conventional SAPO-34 catalyst in the conversion of chloromethane to olefins due to the reduction in total acid sites and the increasing mesopore volume. The overall results of this study demonstrate that it is an effective way to modify the SAPO-34 molecular sieve with sodium dodecyl sulfate and cetyltrimethylammonium bromide as the additives for improving the SAPO-34 catalyst stability in the transformation of chloromethane to olefins.