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Citation: Jinbang Wang, Jinzhe Li, Shutao Xu, Yuchun Zhi, Yingxu Wei, Yanli He, Jingrun Chen, Mozhi Zhang, Quanyi Wang, Wenna Zhang, Xinqiang Wu, Xinwen Guo, Zhongmin Liu. Methanol to hydrocarbons reaction over HZSM-22 and SAPO-11: Effect of catalyst acid strength on reaction and deactivation mechanism[J]. Chinese Journal of Catalysis, ;2015, 36(8): 1392-1402. doi: 10.1016/S1872-2067(15)60953-6 shu

Methanol to hydrocarbons reaction over HZSM-22 and SAPO-11: Effect of catalyst acid strength on reaction and deactivation mechanism

Jinbang Wang ^a,b,d ,
Jinzhe Li ^b ,
Shutao Xu ^b ,
Yuchun Zhi ^b ,
Yingxu Wei ^b,, ,
Yanli He ^b ,
Jingrun Chen ^b,d ,
Mozhi Zhang ^b,d ,
Quanyi Wang ^b ,
Wenna Zhang ^b,d ,
Xinqiang Wu ^b,d ,
Xinwen Guo ^a,, ,
Zhongmin Liu ^b,c,,

1.
a State Key Laboratory of Fine Chemicals, PSU-DUT Joint Center for Energy Research, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China;

Corresponding author: Yingxu Wei, Xinwen Guo, Zhongmin Liu,
Received Date: 26 May 2015
Available Online: 9 July 2015
Fund Project: 国家自然科学基金(201473182, 21273005, 21273230, 21103180). (201473182, 21273005, 21273230, 21103180)

The conversion of methanol to hydrocarbons has been investigated over HZSM-22 and SAPO-11. Both of these catalysts possess one-dimensional 10-ring channels, but have different acidic strengths. Comparison studies and ¹²C/¹³C isotopic switching experiments were conducted to evaluate the influence of the acidic strength of the catalyst on the conversion of methanol, as well as its deactivation mechanism. Although the conversion of methanol proceeded via an alkene methylation-cracking pathway over both catalysts, the acidity of the catalysts had a significant impact on the conversion and product distribution of these reactions. The stability of the catalysts varied with temperature. The catalysts were deactivated at high temperature by the deposition of graphitic coke on their outer surface. Deactivation also occurred at low temperatures a result that the pores of the catalyst were blocked by polyaromatic compounds. The co-reaction of ¹³C-methanol and ¹²C-1-butene confirmed the importance of the acidity of the catalyst on the distribution of the hydrocarbon products.
- HZSM-22,
- SAPO-11,
- Methanol-to-hydrocarbon,
- Acid strength,
- Mechanism
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