External surface modification of as-made ZSM-5 and their catalytic performance in the methanol to propylene reaction

doi:10.1016/S1872-2067(18)63117-1

Abstract

Abstract:

Post-synthetic treatment of high-silica as-made ZSM-5 with organic template in the micropores was explored to reduce/remove the external surface acid density of ZSM-5. It is found that Na₂H₂EDTA treatment can selectively remove the surface Al atoms, but generates new acid sites (likely silanol nests) on the external surface. H₃PO₄ treatment is unable to remove surface Al atoms, while small amount of P is left on the external surface, which effectively decreases the acid density. The catalytic performance of the resultant materials is evaluated in the methanol conversion reaction. H₃PO₄ treatment can effectively improve both the catalytic lifetime and the stability of propene selectivity. This occurs due to a combination of the increased tolerance to the external coke deposition and the depressed coking rate (reduced side reactions). Na₂H₂EDTA treatment only prolongs the catalytic lifetime, resulting from the improved tolerance to the external coke deposition. Under the optimized H₃PO₄treatment condition, the resultant ZSM-5 gives a catalytic lifetime of about 1.5 times longer than the precursor. Moreover, the propene selectivity is improved, showing a slight increasing trend until the deactivation.

Key words: Methanol to propene, ZSM-5 zeolite, Modification, Phosphoric acid, Ethylenediamine tetraacetic acid

Xuebin Zhao, Yang Hong, Linying Wang, Dong Fan, Nana Yan, Xiaona Liu, Peng Tian, Xinwen Guo, Zhongmin Liu. External surface modification of as-made ZSM-5 and their catalytic performance in the methanol to propylene reaction[J]. Chinese Journal of Catalysis, 2018, 39(8): 1418-1426.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(18)63117-1

https://www.cjcatal.com/EN/Y2018/V39/I8/1418

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