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Date of Publication:2015-01-01

Journal:化学反应工程与工艺

Issue:5

Page Number:412-416

ISSN No.:1001-7631

Abstract:In order to improve the catalytic performance of zeolites that convert ethanol to propylene, ZSM-5 zeolites were modified using NaOH solution (0.2 mol/L), and the modified ZSM-5 zeolites were characterized by X-ray diffraction (XRD), scanning electron microscope(SEM), N2 sorption-desorption and temperature programmed desorption (NH3-TPD) techniques. The influence of NaOH-treatment on the structure, morphology and acidity was investigated. It was found that after the 120 min NaOH-treatment on ZSM-5, a certain amount of mesopores were produced and the surface acidity was slightly weakened. However, the NaOH-treated ZSM-5 still kept the MFI microporous skeleton structure. The modified ZSM-5 zeolites were used to transform ethanol to propylene. Compared to ZSM-5, the NaOH-treated ZSM-5 showed significant increase in the propylene yield. A propylene yield as high as 28.8% was obtained at 500��. The improvement of catalytic performance could be attributed to the modification of surface acidity of ZSM-5 and the formation of mesopores. ? 2015, Editorial Board of Journal of Chemical Reaction Engineering and Technology. All right reserved.

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