Citation: Xu PAN, Bing DU, Xin HUANG, Rui-zhuang WANG, Hui WEI, Hai-yong ZHANG, Yi LIU, De-ping XU. 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 shu

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

Xu PAN ¹ ,
Bing DU ^2,, ,
Xin HUANG ² ,
Rui-zhuang WANG ² ,
Hui WEI ² ,
Hai-yong ZHANG ¹ ,
Yi LIU ^2,, ,
De-ping XU ¹

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

Corresponding author: Bing DU, 17240143@chnenergy.com.cn Yi LIU, 20051813@chnenergy.com.cn
Received Date: 28 October 2021
Revised Date: 6 December 2021
Accepted Date: 6 December 2021
Available Online: 9 June 2022

Figures(8)

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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