Effects of Ammonium Hexafluorosilicate Modification on Acidity of HMCM-22 and Catalytic Performance of CuO-ZnO-Al2O3/HMCM-22 for Dimethyl Ether Synthesis

Chinese Journal of Catalysis ›› 2008, Vol. 29 ›› Issue (12): 1242-1246.

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Effects of Ammonium Hexafluorosilicate Modification on Acidity of HMCM-22 and Catalytic Performance of CuO-ZnO-Al2O3/HMCM-22 for Dimethyl Ether Synthesis

MAO Dongsen1*, XIA Jianchao2, CHEN Qingling2, LU Guanzhong1

1 Research Institute of Applied Catalysis, Department of Chemical Engineering, Shanghai Institute of Technology, Shanghai 200235, China; 2 Shanghai Research Institute of Petrochemical Technology, SINOPEC, Shanghai 201208, China

Received:2008-12-25 Online:2008-12-25 Published:2012-09-20

Abstract

Abstract: HMCM-22 zeolite was modified with ammonium hexafluorosilicate at different t emperatures and used as an acidic component of the CuO-ZnO-Al2O3/HMCM-22 bifunctional catalyst for the direct synthesis of dimethyl ether (DME) from syng as. The modification at 45 ℃ (Cat F2) significantly enha nced DME selectivity. However, both CO conversion and DME selectivity were decre ased remarkably when the zeolite was treated at higher temperature (85 ℃, Cat F 3).

Key words: HMCM-22 zeolite, ammonium hexafluorosilicate, modification, methanol dehydration catalyst, bifunctional catalyst, syngas, dimethyl ether

MAO Dongsen*;XIA Jianchao;CHEN Qingling;LU Guanzhong. Effects of Ammonium Hexafluorosilicate Modification on Acidity of HMCM-22 and Catalytic Performance of CuO-ZnO-Al2O3/HMCM-22 for Dimethyl Ether Synthesis[J]. Chinese Journal of Catalysis, 2008, 29(12): 1242-1246.

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Effects of Ammonium Hexafluorosilicate Modification on Acidity of HMCM-22 and Catalytic Performance of CuO-ZnO-Al2O3/HMCM-22 for Dimethyl Ether Synthesis

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