Citation: Yufang GAO, Nan HOU, Yaning LIANG, Ning LI, Yanting ZHANG, Zelong LI, Xiaofeng LI. Nano-thin layer MCM-22 zeolite: Synthesis and catalytic properties of trimethylbenzene isomerization reaction[J]. Chinese Journal of Inorganic Chemistry, ;2024, 40(6): 1079-1087. doi: 10.11862/CJIC.20240036 shu

Nano-thin layer MCM-22 zeolite: Synthesis and catalytic properties of trimethylbenzene isomerization reaction

Yufang GAO ¹ ,
Nan HOU ² ,
Yaning LIANG ³ ,
Ning LI ² ,
Yanting ZHANG ² ,
Zelong LI ² ,
Xiaofeng LI ^2,,

1.
School of Chemistry, Taiyuan University of Technology, Taiyuan 030024, China
2.
School of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, China
3.
Sinopec Catalyst Corporation, Beijing 100864, China

Corresponding author: Xiaofeng LI, lixiaofeng6008@163.com
Received Date: 25 January 2024
Revised Date: 22 April 2024

Figures(8)

A nano-thin layer MWW-type zeolite, derived from fumed silica, was dynamically in-situ synthesized at 150 ℃ using a dual-template system of cetyltrimethylammonium bromide (CTAB) and hexamethylene imine(HMI). The effect of CTAB amount on the zeolite was also investigated. The nano-thin layer samples were characterized using powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), N₂ adsorption-desorption, ammonia temperature programmed desorption (NH₃-TPD), high-resolution transmission electron microscopy (HRTEM), pyridine infrared spectroscopy (Py-IR), and 2, 6-di-tert-butylpyridine infrared spectroscopy (DTBPy-IR). The results indicated that MWW nanosheets with a thickness of 5-10 nm can be prepared using the double template system. Furthermore, the catalytic performance of the samples was evaluated through the isomerization of the trimethylbenzenes reaction. The catalytic results show that the sample d-MWW-4%CTAB exhibits good catalytic performance, with the conversion of 1, 2, 4-trimethylbenzene, the yield of 1, 3, 5-trimethylbenzene, and the selectivity of 1, 3, 5-trimethylbenzene being 34.97%, 22.42%, and 64.09%, respectively. This is primarily attributed to the external surface area and interlayer mesoporous structure formed in the nano-thin layer MCM-22.
- dual template,
- MWW nanosheet,
- in-situ synthesis,
- isomerization
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