Preparation of core-shell structural twin HZSM-5@Silicalite-1 catalysts and its performance for toluene alkylation with methanol

PAN Xu; DU Bing; HUANG Xin; WANG Rui-zhuang; WEI Hui; ZHANG Hai-yong; LIU Yi; XU De-ping

doi:10.19906/j.cnki.JFCT.2021095

Volume 50 Issue 5

May 2022

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Article Navigation > Journal of Fuel Chemistry and Technology > 2022 > 50(5): 611-620

PAN Xu, DU Bing, HUANG Xin, WANG Rui-zhuang, WEI Hui, ZHANG Hai-yong, LIU Yi, XU De-ping. Preparation of core-shell structural twin HZSM-5@Silicalite-1 catalysts and its performance for toluene alkylation with methanol[J]. Journal of Fuel Chemistry and Technology, 2022, 50(5): 611-620. doi: 10.19906/j.cnki.JFCT.2021095

Citation:

PAN Xu, DU Bing, HUANG Xin, WANG Rui-zhuang, WEI Hui, ZHANG Hai-yong, LIU Yi, XU De-ping. Preparation of core-shell structural twin HZSM-5@Silicalite-1 catalysts and its performance for toluene alkylation with methanol[J]. Journal of Fuel Chemistry and Technology, 2022, 50(5): 611-620. doi: 10.19906/j.cnki.JFCT.2021095

Citation:

PAN Xu, DU Bing, HUANG Xin, WANG Rui-zhuang, WEI Hui, ZHANG Hai-yong, LIU Yi, XU De-ping. Preparation of core-shell structural twin HZSM-5@Silicalite-1 catalysts and its performance for toluene alkylation with methanol[J]. Journal of Fuel Chemistry and Technology, 2022, 50(5): 611-620. doi: 10.19906/j.cnki.JFCT.2021095

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Preparation of core-shell structural twin HZSM-5@Silicalite-1 catalysts and its performance for toluene alkylation with methanol

doi: 10.19906/j.cnki.JFCT.2021095

1.
China University of Mining and Technology-Beijing, School of Chemical & Environmental Engineering, Beijing 100083, China
2.
National Institute of Clear-and-Low-Carbon Energy, Beijing 102209, China

Received Date: 2021-10-28
Accepted Date: 2021-12-06
Rev Recd Date: 2021-12-06

Available Online: 2021-12-20

Publish Date: 2022-05-24

Abstract

Abstract

The technology of alkylation of toluene with methanol to p-xylene has attracted much attention due to the high selectivity of p-xylene and low energy consumption in product separation unit. Twin HZSM-5 molecular sieve has the characteristics of large coverage proportion of zigzag channels on the surface and less aluminum distribution on the outer surface. It shows high selectivity for p-xylene in the alkylation of toluene and methanol. In this paper, silicalite-1 (S-1) was grown epitaxially on the surface of twin HZSM-5 molecular sieve by hydrothermal crystallization, and twin HZSM-5@Silicalite-1 core-shell catalyst was obtained. Compared with twin HZSM-5, HZSM-5@40Silicalite-1 core-shell catalyst shows excellent catalytic performance in toluene methanol alkylation. Under the reaction conditions of 470 ℃, 0.1 MPa and hydrogen atmosphere, the conversion of toluene is 8.5% and the selectivity of p-xylene is 98.4%. Then, the effect of solid-liquid mass ratio of nuclear HZSM-5 and silicalite-1 shell precursors on the growth of silicalite-1 crystal was further studied, and the effect of silicalite-1 on the catalytic performance of twin HZSM-5 was investigated. The pore structure and acid properties of core-shell materials were studied in detail by SEM, XRD, XRF, liquid static adsorption, N₂ adsorption desorption, NH₃-TPD and Py-FTIR.
- twin HZSM-5,
- silicalite-1,
- core-shell structure,
- shape-selective catalysis,
- para-xylene

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References(45)

References

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