Selective dealumination of ZSM-5 by steaming and its effect on ethanol to propene

XUE Yan-feng; NIU Yu-lan; ZHENG Hong-yan; CUI Xiao-jing; MA Qing-guo; TANG Jian-ke; DING Li-feng

doi:10.1016/S1872-5813(21)60064-6

Volume 49 Issue 8

Aug. 2021

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Article Navigation > Journal of Fuel Chemistry and Technology > 2021 > 49(8): 1111-1121

XUE Yan-feng, NIU Yu-lan, ZHENG Hong-yan, CUI Xiao-jing, MA Qing-guo, TANG Jian-ke, DING Li-feng. Selective dealumination of ZSM-5 by steaming and its effect on ethanol to propene[J]. Journal of Fuel Chemistry and Technology, 2021, 49(8): 1111-1121. doi: 10.1016/S1872-5813(21)60064-6

Citation:

XUE Yan-feng, NIU Yu-lan, ZHENG Hong-yan, CUI Xiao-jing, MA Qing-guo, TANG Jian-ke, DING Li-feng. Selective dealumination of ZSM-5 by steaming and its effect on ethanol to propene[J]. Journal of Fuel Chemistry and Technology, 2021, 49(8): 1111-1121. doi: 10.1016/S1872-5813(21)60064-6

Citation:

XUE Yan-feng, NIU Yu-lan, ZHENG Hong-yan, CUI Xiao-jing, MA Qing-guo, TANG Jian-ke, DING Li-feng. Selective dealumination of ZSM-5 by steaming and its effect on ethanol to propene[J]. Journal of Fuel Chemistry and Technology, 2021, 49(8): 1111-1121. doi: 10.1016/S1872-5813(21)60064-6

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Selective dealumination of ZSM-5 by steaming and its effect on ethanol to propene

doi: 10.1016/S1872-5813(21)60064-6

Department of Chemistry and Chemical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China

Funds: The project was supported by the National Science Foundation of China (22072105), Natural Science Foundation of Shanxi Province of China (201901D111321), Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (2020L0655)

Received Date: 2021-01-25
Rev Recd Date: 2021-02-21

Available Online: 2021-03-11

Publish Date: 2021-08-31

Abstract

Abstract

The effects of steaming at varying times and temperatures on ZSM-5 pore structures, framework Al distribution, acid properties and ethanol to propene (ETP) catalytic performance were systematically studied in this study. The results show that the crystallinity and specific surface areas of steam treated ZSM-5 samples decrease with the increase treatment time and temperature. ²⁷Al MAS NMR and Co(Ⅱ) exchange-ICP results show that the isolated framework Al species (Al_single) can be preferentially removed from the zeolite framework, while the paired Al sites (Al_pairs) remain relatively stable after steam treatment. The characterization of Py-IR reveals that the concentration of B acid sites and the acid strength are all declined with the steaming time or temperature increase. The catalytic results of ETP at 450 ℃ show that the sample after steaming gives improved selectivities to propene and butene at the expense of ethene conversion and alkanes selectivity relative to the unmodified zeolite. Besides, a good positive correlation between ethylene conversion and Al_single concentration is found, whereas the propene formation is influenced by the combination effect of Al_single and Al_pairs sites.
- ZSM-5 zeolite,
- steaming,
- dealumination,
- ethanol to propene,
- Al distribution

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References(29)

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