Importance of metal location in M-H zeolite for synergistically catalyzing dimethyl ether carbonylation

doi:10.1016/j.cjche.2021.11.019

Abstract

Abstract: Mordenite (MOR) has shown great potential to catalyze dimethyl ether (DME) carbonylation to methyl acetate (MA) in industry. The synergy between metal species and Brønsted acid sites accelerates DME conversion. Here we designed and prepared two catalysts with different Ag locations by seed-directed growth method and two-step impregnation method (named as Ag@HMOR and Ag/HMOR-out, respectively), to explain the effect of Ag location on catalytic performance. The results of TEM, XPS, CO-IR and UV–Vis showed that Ag species mainly presented as Ag⁰ species over both Ag@HMOR and Ag/HMOR-out. Meanwhile, Ag⁰ species mainly located in the micropores of Ag@HMOR, while as for Ag/HMOR-out, Ag⁰ mainly existed on external surface. After comparing the performance of the catalysts with different Ag positions, we confirmed that the Ag⁰ species encapsulated in the channels of HMOR promoted the DME carbonylation, which revealed the importance of spatial adjacency on the acid-metal catalysts.

Key words: Dimethyl ether, Carbonylation, Silver modification, Metal location

摘要： Mordenite (MOR) has shown great potential to catalyze dimethyl ether (DME) carbonylation to methyl acetate (MA) in industry. The synergy between metal species and Brønsted acid sites accelerates DME conversion. Here we designed and prepared two catalysts with different Ag locations by seed-directed growth method and two-step impregnation method (named as Ag@HMOR and Ag/HMOR-out, respectively), to explain the effect of Ag location on catalytic performance. The results of TEM, XPS, CO-IR and UV–Vis showed that Ag species mainly presented as Ag⁰ species over both Ag@HMOR and Ag/HMOR-out. Meanwhile, Ag⁰ species mainly located in the micropores of Ag@HMOR, while as for Ag/HMOR-out, Ag⁰ mainly existed on external surface. After comparing the performance of the catalysts with different Ag positions, we confirmed that the Ag⁰ species encapsulated in the channels of HMOR promoted the DME carbonylation, which revealed the importance of spatial adjacency on the acid-metal catalysts.

关键词: Dimethyl ether, Carbonylation, Silver modification, Metal location

Shiyue Li, Shouying Huang, Kai Cai, Ying Li, Jing Lv, Xinbin Ma. Importance of metal location in M-H zeolite for synergistically catalyzing dimethyl ether carbonylation[J]. Chinese Journal of Chemical Engineering, 2022, 41(1): 350-357.

Shiyue Li, Shouying Huang, Kai Cai, Ying Li, Jing Lv, Xinbin Ma. Importance of metal location in M-H zeolite for synergistically catalyzing dimethyl ether carbonylation[J]. 中国化学工程学报, 2022, 41(1): 350-357.

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