Application of HF Modified Pt/ZSM-5 Catalyst in Benzene Methylation with Methanol

doi:10.11944/j.issn.1000-0518.2016.05.150418

Chinese Journal of Applied Chemistry ›› 2016, Vol. 33 ›› Issue (5): 571-576.DOI: 10.11944/j.issn.1000-0518.2016.05.150418

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Application of HF Modified Pt/ZSM-5 Catalyst in Benzene Methylation with Methanol

LIU Si^a,WEN Zhenhao^a,YANG Daqiang^a,ZHU Xuedong^a^b^*()

^a Engineering Research Center of Large Scale Reactor Engineering and Technology
^b State Key Laboratory of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China

Received:2015-11-30 Accepted:2016-03-04 Published:2016-04-29 Online:2016-04-29
Contact: ZHU Xuedong
Supported by:
Supported by the National Natural Science Foundation of China(No.21446003), the Doctoral Fund of Ministry of Education(No.20130074110018)

Abstract

Abstract:

Hydrofloride modified Pt/ZSM-5 catalysts were studied and applied in benzene alkylation with methanol. The effects of acidity and pore structures of the catalysts were studied by NH₃-TPD and N₂ adsorption. The results show that the acidity and the amount of acidic sites of Pt/ZSM-5 are increased by HF modification and the catalytic performance in benzene methylation with methanol is also enhanced. The selectivity of toluene and xylene can reach to 92.20% when 3%HF-0.2%Pt/ZSM-5 catalyst is used in benzene methylation with methanol. When the loading of HF is more than 6%, partially removed aluminum and silicon from the zeolite framework will block the pores of zeolite resulting in decreasing diffusions of reactants and products, and eventually reducing catalytic performance of zeolites. The calculated activation energy of benzene methylation with methanol in HF modified Pt/ZSM-5 catalyst is 118 kJ/mol.

Key words: ZSM-5, HF, benzene, methanol, methylation

LIU Si,WEN Zhenhao,YANG Daqiang,ZHU Xuedong. Application of HF Modified Pt/ZSM-5 Catalyst in Benzene Methylation with Methanol[J]. Chinese Journal of Applied Chemistry, 2016, 33(5): 571-576.

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Application of HF Modified Pt/ZSM-5 Catalyst in Benzene Methylation with Methanol

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