Release Time:2025-06-03  Hits:

Date of Publication: 2022-10-06

Journal: 石油炼制与化工

Volume: 41

Issue: 7

Page Number: 23-27

ISSN: 1005-2399

Abstract: The effect of nanosized HZSM-5 modification methods including citric acid treatment, steam treatment and steam-citric acid treatment, on the catalytic activity and stability of nanosized HZSM-5 during aromatics transalkylation reaction was investigated. The results showed that citric acid treatment could improve the adsorption-diffusion performance of the catalyst and thus increased the activity of nanosized HZSM-5. When nanosized HZSM-5 was steamed at 350 ��C, most of the useful acid sites were eliminated, which led to the decrease of both activity and stability of the catalyst. The combined modification of steam-citric acid treatment could keep the acid sites for transalkylation reaction and increase catalyst stability simultaneously, which proposed a suitable method to develop catalysts for the transalkylation of benzene and 1, 2, 4-trimethylbenzene.

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