Premium
Identifying the Active Silver Species in Carbonylation of Dimethyl Ether over Ag−HMOR
Author(s) -
Li Shiyue,
Cai Kai,
Li Ying,
Liu Shuaipeng,
Yu Man,
Wang Yue,
Ma Xinbin,
Huang Shouying
Publication year - 2020
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.202000533
Subject(s) - dimethyl ether , carbonylation , catalysis , mordenite , zeolite , chemistry , syngas , metal , fourier transform infrared spectroscopy , transition metal , nuclear chemistry , inorganic chemistry , organic chemistry , chemical engineering , carbon monoxide , engineering
As one of the key steps in ethanol production from syngas, dimethyl ether (DME) carbonylation to methyl acetate (MA) catalyzed by zeolite has drawn much attention. H‐mordenite (HMOR) modified with metal has been continuously developed for improving catalytic performance. Here, we investigated the role of Ag species through three series of Ag−HMOR catalysts prepared through altering Ag loading, varying reduction temperature and additional ion exchange. TEM, XPS, CO FTIR and UV‐Vis spectroscopy were employed to identify the nature and the amount of Ag species in x Ag−HM with different Ag loading. Taken together with catalytic performance evaluation, 5Ag−HM with the moderate size of Ag 0 species (Ag n δ+ and Ag m clusters) was proved to have greatest promotion effect on DME carbonylation. This was also evidenced by further improved MA formation rate over catalysts via elevating reduction temperature or via additional NH 4 Cl ion exchange, which contained more Ag 0 and fewer Ag + species respectively. These provide insight into metal‐modified HMOR, inspiring design and fabrication of zeolite catalysts with multi‐active sites.