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Citation: WANG Wen-Lan, LIU Bai-Jun, ZENG Xian-Jun. Catalytic Cracking of C₄ Hydrocarbons on ZSM-5 Molecular Sieves with Low SiO₂/A_l2O₃ Molar Ratio[J]. Acta Physico-Chimica Sinica, ;2008, 24(11): 2102-2107. doi: 10.3866/PKU.WHXB20081128 shu

Catalytic Cracking of C₄ Hydrocarbons on ZSM-5 Molecular Sieves with Low SiO₂/A_l2O₃ Molar Ratio

1.
College of Chemistry and Biology, Beihua University, Jilin 132013, Jinlin Province, P. R. China; The Key Laboratory of Catalysis, China National Petroleum Corporation, University of Petroleum, Beijing 102249, P. R. China

Received Date: 7 April 2008
Available Online: 31 July 2008

The catalytic cracking of C4 hydrocarbons was investigated using ZSM-5 with low SiO2/Al2O3 molar ratio (n(SiO2)/n(Al2O3)=20-45) as a catalyst. The reaction results indicated that the catalyst with lower SiO2/Al2O3 molar ratio exhibited higher catalytic activity at low temperatures. The yield of propylene and ethylene over ZSM-5 with low SiO2/Al2O3 molar ratio was lower than that over the catalyst with high SiO2/Al2O3 molar ratio. However the yield of benzene and toluene was reversed. At 625 ℃, the total yield of ethylene, propene, benzene, and toluene was as high as 79.42%over the catalyst with n(SiO2)/n(Al2O3)=20. The acidity characterization by temperature-programmed desorption of ammonia and pyridine adsorption FT-IR showed that ZSM-5 with lower SiO2/Al2O3 molar ratio had more Bronsted (B) and Lewis (L) acid sites. This accounted for the higher activity at low temperature and higher yield of benzene and toluene in the cracking of C4 hydrocarbons.
- ZSM-5; Low SiO2/Al2O3 molar ratio; Cracking of C4 hydrocarbons; Ethylene and propylene; Benzene and toluene
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Catalytic Cracking of C4 Hydrocarbons on ZSM-5 Molecular Sieves with Low SiO2/Al2O3 Molar Ratio

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Catalytic Cracking of C₄ Hydrocarbons on ZSM-5 Molecular Sieves with Low SiO₂/A_l2O₃ Molar Ratio