Citation: SHAO Juan, FU Ting-jun, CHANG Jiang-wei, WAN Wei-li, QI Rui-yue, LI Zhong. Effect of ZSM-5 crystal size on its catalytic properties for conversion of methanol to gasoline[J]. Journal of Fuel Chemistry and Technology, ;2017, 45(1): 75-83. shu

Effect of ZSM-5 crystal size on its catalytic properties for conversion of methanol to gasoline

Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, China

Corresponding author: LI Zhong, lizhong@tyut.edu.cn
Received Date: 6 June 2016
Revised Date: 24 August 2016

Fund Project: Science and Technology Infrastructure Plat form Construction Program of Shanxi Procince 2015091009National Natural Science Foundation of China 21606160the Qualified Personnel Foundation of Taiyuan University of Technology tyut-rc201454a

Figures(10)

Four-sized monodispersed ZSM-5 crystals, being 70, 200, 400 and 650 nm, were hydrothermally synthesized by changing the H₂O/Si molar ratio in the synthesis gel, and characterized with XRD, TEM, BET and NH₃-TPD techniques. The crystal size effect of ZSM-5 on its catalytic performance for conversion of methanol to gasoline (MTG) was investigated. It was shown that the external surface area of the sample decreased with its crystal size, while the acid site amount firstly increased, and then kept almost constant. Nevertheless, 650 nm ZSM-5 crystals attaching small particles exhibit large external surface area and strong acidity. The catalytic stability and the liquid hydrocarbon yield decreased with increasing crystal size. The sample with a crystal size of 70 nm shows a catalytic lifetime of 96 h and a gasoline yield of 30.8%. The large external surface area and relatively strong acidity endow the sample with a crystal size of 650 nm also has a catalytic lifetime of 91 h, indicating that synthesis of large ZSM-5 crystals with small crystallites adhered to their surface could be a potential way to improve the catalytic performance.
- ZSM-5,
- H₂O/Si molar ratio,
- crystal size effect,
- diffusion property,
- MTG catalytic performance
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