文献类型：期刊文献

英文题名：Influential Role of Elemental Migration in a Composite Iron-Zeolite Catalyst for the Synthesis of Aromatics from Syngas

作者：Li, Minzhe[1];Nawaz, Muhammad Asif[1];Song, Guiyao[1];Zaman, Waqas Qamar[1];Liu, Dianhua[1]

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

年份：2020

卷号：59

期号：19

起止页码：9043

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20210109727570);WOS:【SCI-EXPANDED(收录号:WOS:000535251500015)】；

基金：This work was supported by the National Key R&D Program of China (2017YFB0602204).

语种：英文

外文关键词：Aromatization - Sodium compounds - Synthesis gas - Metals - Iron alloys - Binary alloys - Manganese alloys - Catalyst selectivity - Iron oxides

摘要：A composite catalyst of a metal oxide and a zeolite has been widely adopted for the direct conversion of syngas to aromatics (STAs). However, its stability along with higher conversion and selectivity remains a bigger challenge to overcome. Herein, we present an efficient STA catalyst composed of a Na-modified Fe-Mn oxide and an HZSM-5 zeolite; however, a gradual decline was observed in the aromatization activity of the zeolite, which was significantly ascribed to the influence of elemental migration from the Fe-based catalyst to the zeolite. Further investigation revealed that the migrated metal oxides could block pore channels; meanwhile, abundant Na diminished Lewis acid sites by donating electrons to the zeolite during the reaction, which adversely affected the catalytic performance. Therefore, on synthesizing a well-designed catalyst in optimized promoter contents and integrating it with high-acidity nano-HZSM-5 in proper proximity, a higher CO conversion greater than 95% and an overall aromatic selectivity exceeding 53% were achieved with extended stability of 120 h. This work reveals a particular dimension for the microscopic interaction between the metal oxide and the zeolite in the composite catalyst, providing a promising perception of catalyst design for the synthesis of aromatics from syngas.