Liquid deposition modification of nano-ZSM-5 zeolite and catalytic performance in aromatization of Hexene-1

Yujun Fang; Xiaofang Su; Wei Wang; Wei Wu

doi:10.24294/can.v4i1.1330

Liquid deposition modification of nano-ZSM-5 zeolite and catalytic performance in aromatization of Hexene-1

Yujun Fang, Xiaofang Su, Wei Wang, Wei Wu

Article ID: 1330
Vol 4, Issue 1, 2021

VIEWS - 879 (Abstract) 200 (PDF)

Abstract

The Olefin aromatization is an important method for the upgrade of catalytic cracking (FCC) gasoline and production of fuel oil with high octane number. The nano-ZSM-5 zeolite was synthesized via a seed-induced method, a series of modified nano-ZSM-5 zeolite samples with different Ga deposition amount were prepared by Ga liquid deposition method. The XRD, N₂ physical adsorption, SEM, TEM, XPS, H₂-TPR and Py-IR measurements were used to characterize the morphology, textural properties and acidity of the modified ZSM-5 zeolites. The catalytic performance of the Hexene-1 aromatization was evaluated on a fixed-bed microreactor. The effects of Ga modification on the physicochemical and catalytic performance of nano-ZSM-5 zeolites were investigated. The Ga species in the modified nano-ZSM-5 zeolites mainly exist as the form of Ga₂O₃ and GaO⁺, which provide strong Lewis acid sites. The aromatics selectivity over Ga modified nano-ZSM-5 zeolite in the Hexene-1 aromatization was significantly increased, which could be attributed to the improvement of the dehydrogenation activity. The selectivity for aromatics over the Ga4.2/NZ5 catalyst with suitable Ga deposition amount reached 55.4%.

Keywords

Nanosized ZSM-5 Zeolite; Ga Modification; Liquid Deposition; Hexene-1; Aromatization

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DOI: https://doi.org/10.24294/can.v4i1.1330