Title: Preparation of dimethylether by Catalyzed Dehydration of methanol with H_4SiW_(12)O_(40)-La_2O_3/γ-Al_2O_3 as catalyst
Abstract: Supported heteropoly acid composite catalyst H 4SiW 12 O 40 -La 2O 3/γ-Al 2O 3, prepared by the impregnation method was used for the condensation of methanol to form dimethylether. The catalyst was charactered by N 2 adsorption,pyridine adsorption IR spectra,NH 3-TPD,XRD. The quantity of heteropoly acid on the supporter,impregnation time of heteropoly acid, reaction temperature and mass hour space velocity were studied. The catalyst has high selectivity of dimethyl ether and high conversion of methanol. The optimal conditions of preparing catalyst are as follow:HSiW 10%~16%, impregnation time 6 h. At atmospheric pressure, the optimal reaction conditions are as follow:reaction temperature 300 ℃ , MHSV 1.0 h -1 . At the reaction conditions, selectivity of dimethyl is 99.9% and conversion of methanol is 85%.
Publication Year: 2001
Publication Date: 2001-01-01
Language: en
Type: article
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