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Enhanced ethene to propene ratio over Zn-modified SAPO-34 zeolites in methanol-to-olefin reaction

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Abstract

A series of Zn-modified SAPO-34 zeolites were prepared by the impregnation method and the effect of Zn modification on the catalytic performance of SAPO-34 zeolite in the methanol-to-olefin (MTO) reaction was comprehensively investigated. The physicochemical properties of the parent and Zn-modified SAPO-34 zeolites were characterized by XRD, SEM, N2 adsorption–desorption, NH3-TPD, H2-TPR, FTIR, UV-vis DRS and TGA. The reaction results show that the ethene selectivity and ethene to propene ratio are significantly improved over Zn-modified SAPO-34 zeolites in the initial period of the MTO reaction, and the optimum catalytic performance is obtained over 2.0Zn/SAPO-34 zeolite with a methanol conversion of 99.1 wt%, an ethene selectivity of 54.6 C-%, a light olefin selectivity of 88.9 C-% and an ethene to propene ratio of 1.9. Based on the characterization and reaction results, the enhanced ethene selectivity and ethene to propene ratio over Zn-modified SAPO-34 zeolites are attributed to the increased diffusion hindrance originating from the incorporated Zn-related species enrichment and the facilitated formation of aromatics.

Graphical abstract: Enhanced ethene to propene ratio over Zn-modified SAPO-34 zeolites in methanol-to-olefin reaction

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Publication details

The article was received on 19 Feb 2019, accepted on 25 Mar 2019 and first published on 26 Mar 2019


Article type: Paper
DOI: 10.1039/C9CY00335E
Citation: Catal. Sci. Technol., 2019, Advance Article

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    Enhanced ethene to propene ratio over Zn-modified SAPO-34 zeolites in methanol-to-olefin reaction

    H. Huang, H. Wang, H. Zhu, S. Zhang, Q. Zhang and C. Li, Catal. Sci. Technol., 2019, Advance Article , DOI: 10.1039/C9CY00335E

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