Effect of heat treatment on the structure, acidity and catalytic performance of HZSM-5 zeolites in ethanol dehydration

SHENG Qing-tao; LING Kai-cheng; LI Zhen-rong; ZHAO Liang-fu

Volume 40 Issue 04

Apr. 2012

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Article Navigation > Journal of Fuel Chemistry and Technology > 2012 > (04): 494-500

SHENG Qing-tao, LING Kai-cheng, LI Zhen-rong, ZHAO Liang-fu. Effect of heat treatment on the structure, acidity and catalytic performance of HZSM-5 zeolites in ethanol dehydration[J]. Journal of Fuel Chemistry and Technology, 2012, (04): 494-500.

Citation:

SHENG Qing-tao, LING Kai-cheng, LI Zhen-rong, ZHAO Liang-fu. Effect of heat treatment on the structure, acidity and catalytic performance of HZSM-5 zeolites in ethanol dehydration[J]. Journal of Fuel Chemistry and Technology, 2012, (04): 494-500.

Citation:

SHENG Qing-tao, LING Kai-cheng, LI Zhen-rong, ZHAO Liang-fu. Effect of heat treatment on the structure, acidity and catalytic performance of HZSM-5 zeolites in ethanol dehydration[J]. Journal of Fuel Chemistry and Technology, 2012, (04): 494-500.

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Effect of heat treatment on the structure, acidity and catalytic performance of HZSM-5 zeolites in ethanol dehydration

1.
College of Chemistry and Chemical Engineering|Taiyuan University of Technology, Taiyuan 030024, China;
2.
Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China

Received Date: 2011-05-09
Rev Recd Date: 2011-07-28
Publish Date: 2012-04-30

Abstract

Abstract

Heat treatment at high temperature was used to modify HZSM-5 zeolites. The HZSM-5 samples before and after heat treatments were characterized by X-ray diffraction (XRD), ²⁷Al-MAS NMR, N₂ adsorption, inductively couple plasma emission spectroscopy (ICP-AES), temperature-programmed desorption of ammonia (NH₃-TPD), and Fourier transform infrared (FT-IR) spectroscopy of adsorbed pyridine. The effects of heat treatment conditions on the structure, acidity, and catalytic performance of HZSM-5 zeolites in dehydration of ethanol to ethylene were investigated. The results showed that the heat treatment leads to dealuminization from the zeolite framework and channels, which may decrease the amount of Bronsted acid sites, increase the Lewis acid sites and the pore volume, and form new mesopores. When the heat-treated HZSM-5 is used as the catalyst in ethanol dehydration, owing to its appropriate acidity and binary meso/micro porous structure, the side reaction is reduced and the selectivity to ethylene and the catalyst life time are increased significantly.
- heat treatment,
- HZSM-5 zeolites,
- ethanol,
- ethylene,
- ethanol dehydration

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References(27)

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