甲醇催化转化制丙烯中HZSM-5分子筛的尺寸效应

doi:10.3866/PKU.WHXB201206211

Abstract

Abstract:

Catalytic conversion of methanol to propylene (MTP) by HZSM-5 zeolite is of great importance in industrial applications. In this paper, a series of HZSM-5 zeolites with different crystal sizes were synthesized by adjusting the initial gel composition, crystallization temperature, and crystallization time. The crystal structure, size, morphology, pore structure, and acidity of HZSM-5 were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen adsorption, and temperature-programmed desorption of ammonia (NH₃-TPD). The catalytic activity and stability of HZSM-5 with different crystal sizes for MTP were evaluated on a continuous flowing fixed-bed reactor. Coke deposited on HZSM-5 was analyzed by thermogravimetric (TG) analyzer. Results indicated that with smaller crystal size, HZSM-5 zeolite had larger surface area and pore volume, higher density of pore openings, and shorter path length of micropore channels that prevent side reactions. For MTP reaction, smaller crystal sizes of HZSM-5 showed a higher resistance and better tolerance to coke, and longer catalytic lifetime. The lowering of both the total and strong acidity on HZSM-5 with smaller crystal size favored a higher selectivity of target product, propylene.

Key words: HZSM-5 zeolite, Crystal size, Methanol, Propylene, Acid property, Coke deposition

MSC2000:

O643

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YAO Min, HU Si, WANG Jian, DOU Tao, WU Yong-Ping. Size Effect of HZSM-5 Zeolite on Catalytic Conversion of Methanol to Propylene[J].Acta Phys. -Chim. Sin., 2012, 28(09): 2122-2128.

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Size Effect of HZSM-5 Zeolite on Catalytic Conversion of Methanol to Propylene

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