文献类型：期刊文献

英文题名：Synthesis of Submicron SSZ-13 with Tunable Acidity by the Seed-Assisted Method and Its Performance and Coking Behavior in the MTO Reaction

作者：Xu, Zhiqiang[1];Ma, Hongfang[1];Huang, Yuxuan[1];Qian, Weixin[1];Zhang, Haitao[1];Ying, Weiyong[1]

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

年份：2020

卷号：5

期号：38

起止页码：24574

外文期刊名：ACS OMEGA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000576748800046)】；

基金：The authors acknowledge the China Postdoctoral Science Foundation (2017M611473) and the Fundamental Research Funds for the Central Universities (222201917013).

语种：英文

摘要：Submicron SSZ-13 with different acidities was synthesized successfully with the assistance of nanosized SSZ-13 seeds. The methanol-to-olefins (MTO) properties of submicron SSZ-13 were evaluated. The lifetime of submicron SSZ-13 was enhanced because of the crystal size reduction. The selectivity of light olefins was improved evidently at the early stage of the MTO reaction as the acidity density decreased. TG, GC-MS, and in situ UV/vis spectra were utilized to investigate coking behavior during the MTO reaction. It was found that the acidity density influences the nature and rate of coke formation. The majority of the hydrocarbon pool species over SSZ-13 with a low acidity density (125.2 mu mol/g) were methylated benzene carbocations, while that over SSZ-13 with a high acidity density (330.2 mu mol/g) were methylated naphthalene carbocations. The low acidity density of SSZ-13 can suppress the hydrogen transfer reaction and polyaromatic generation.