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Citation: LIU Bai-Jun, ZENG Xian-Jun. Catalytic Conversion of Mixed C₄ Hydrocarbons over ZSM-5/ZSM-57 Composite Zeolite Catalyst[J]. Acta Physico-Chimica Sinica, ;2009, 25(10): 2055-2060. doi: 10.3866/PKU.WHXB20091032 shu

Catalytic Conversion of Mixed C₄ Hydrocarbons over ZSM-5/ZSM-57 Composite Zeolite Catalyst

1.
Key Laboratory of Catalysis, China National Petroleum Corporation, China University of Petroleum, Beijing 102249, P. R. China

Received Date: 14 May 2009
Available Online: 8 September 2009

The catalytic performance of a ZSM-5/ZSM-57 composite zeolite catalyst for the conversion of mixed C4 hydrocarbons was investigated. The acidic properties of the ZSM-5/ZSM-57 composite zeolite catalyst were characterized by means of ammonia temperature-programmed desorption (NH3-TPD) and pyridine adsorption Fourier transform infrared (FT-IR) spectroscopy. Results indicated that compared with ZSM-5 zeolite, the ZSM-5/ZSM-57 composite zeolite with lower ZSM-5 content showed higher catalytic activity and higher selectivity for ethylene and propylene because of its enhanced acidic strength and increased acid amount. ZSM-57 has small pores in the composite zeolite and this is beneficial in the shape-selective reaction of ethylene and propylene. On the contrary, the ZSM-5/ZSM-57 composite zeolite with higher ZSM-5 content exhibited higher selectivity for benzene and toluene. This probably results from the pore structure and the structure matching property of the ZSM-5/ZSM-57 composite zeolite, which favors the aromatization of mixed C4 hydrocarbons.
- ZSM-5/ZSM-57 composite zeolite,
- Mixed C4 hydrocarbons,
- Ethylene,
- Propylene,
- Benzene,
- Toluene,
- Shape-selective catalysis
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Catalytic Conversion of Mixed C4 Hydrocarbons over ZSM-5/ZSM-57 Composite Zeolite Catalyst

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Catalytic Conversion of Mixed C₄ Hydrocarbons over ZSM-5/ZSM-57 Composite Zeolite Catalyst