Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 119, Issue 1, Pages 524-533Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp511543x
Keywords
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Funding
- National Natural Science Foundation of China [51276166]
- National Science and Technology Supporting Plan [2015BAD15B06]
- Program of Introducing Talents of Discipline to University [B08026]
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Various metal-modified HMOR catalysts for the carbonylation of dimethyl ether (DME) were prepared by ion exchange with Cu, Ni, Co, Zn, or Ag. The catalysts were characterized by the BrunauerEmmettTeller method, X-ray diffraction measurements, transmission electron microscopy, X-ray photoelectron spectroscopy, nuclear magnetic resonance spectroscopy, temperature-programmed desorption of ammonia, and temperature-programmed oxidation. We found that the pore structure of mordenite (HMOR) was well maintained and that the metal species were highly dispersed on the zeolite. On HMOR subjected to ion exchange with Cu, Ni, Co, or Zn, the metal ions were mainly at the zeolite exchange sites with some corresponding metal oxides. Some Bronsted acid sites were converted to Lewis acid sites, and some strong acid sites were formed together. HMOR modified with Cu, Ni, or Co showed good catalytic performance, with Cu/HMOR exhibiting the highest performance. DME conversion and methyl acetate selectivity were close to 100% under the optimum reaction conditions, which is attributed to the joint participation of Bronsted acid sites contributing to DME conversion and metal Lewis acid sites contributing to CO binding, along with the appropriate coordination structure. Modification with Cu not only improved the catalytic activity, but also suppressed carbon deposition and extended the catalyst lifetime.
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