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A new method of ethanol synthesis from dimethyl ether and syngas in a sequential dual bed reactor with the modified zeolite and Cu/ZnO catalysts

2010; Elsevier BV; Volume: 164; Issue: 1 Linguagem: Inglês

10.1016/j.cattod.2010.10.027

1873-4308

Guohui Yang, Xiaoguang San, Nan Jiang, Yuki Tanaka, Xingang Li, Quan Jin, Kai Tao, Fanzhi Meng, Noritatsu Tsubaki,

Catalysis and Hydrodesulfurization Studies

Ethanol was directly synthesized from dimethyl ether (DME) and syngas (CO + H2) with the combination of Cu-modified H-Modernite (H-MOR) zeolite catalyst and metallic Cu/ZnO catalysts in a dual-catalyst bed reactor. The methyl acetate (MA) was firstly formed by DME carbonylation on the upper zeolite catalyst layer, and then was subsequently hydrogenated on the lower Cu/ZnO catalyst layer to be converted into ethanol accompanying with methanol. A copper doped H-MOR catalyst prepared by ion-exchange method exhibited better catalytic activity compared with the pure H-MOR catalyst in the single DME carbonylation reaction, and the influence of reaction temperature was investigated in detail, confirming that the optimal reaction temperature for this copper doped H-MOR catalyst was 493 K. For ethanol synthesis in the dual catalyst bed reactor, the combination of copper doped H-MOR catalyst with Cu/ZnO catalyst effectively improved the DME conversion, enhanced the ethanol selectivity in the final products remarkably, if compared with the combination of pure H-MOR catalyst with Cu/ZnO catalyst.