文献类型：期刊文献

英文题名：Effects of the Template on Low-Silica SAPO-34 in a Bifunctional Catalyst for the Direct Conversion of Syngas to Light Olefins

作者：Jin, Daoming[1];Meng, Xin[1];Gao, Wenli[1];Xu, Bowen[1];Dai, Wenhua[1];Zhao, Rui[1];Xu, Fan[1];Yang, Dandan[1];Xin, Zhong[1,2]

机构：[1]Shanghai Key Lab Multiphase Mat Chem Engn, East China Univ Sci & Technol, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2023

卷号：62

期号：1

起止页码：211

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20225213315264);WOS:【SCI-EXPANDED(收录号:WOS:000904093000001)】；

语种：英文

外文关键词：Catalyst selectivity - Chromium compounds - Crystallinity - Molar ratio - Morphology - Silicon - Synthesis gas - Zeolites - Zinc compounds

摘要：ABSTRACT: Bifunctional catalysts composed of metal oxides and zeolites have become a promising method for direct conversion of syngas into light olefins recently. To maintain high selectivity of light olefins in syngas direct conversion, a series of low-silica SAPO-34 zeolites were synthesized hydrothermally with three templates including triethylamine (TEA), tetraethylammonium hydroxide (TEAOH), and a mixture of TEA and TEAOH. The characterization results indicated that the crystallinity, acidity, structure, and morphology of zeolites would be greatly affected by the templates. Compared with the single templates, low-silica SAPO-34 prepared with the dual template possessed suitable acidity, higher crystallinity, and regular morphology, thus exhibiting higher selectivity of light olefins. The bifunctional catalyst consisting of ZnCrOx and SAPO-34 prepared using the dual template with a Si/Al molar ratio of 0.025 achieved a C2=???C4= selectivity of 76.1% and a CO conversion of 39.9% at 4 MPa and 5400 mL g???1 h???1. These results demonstrated that it is crucial to control the structure and acidity of zeolites in the design of bifunctional catalysts with excellent shape selectivity for syngas conversion to olefins.