Effect of Rare Earths on n-Hexane Aromatization over HZSM-5 Catalyst
来源期刊：JOURNAL OF RARE EARTHS2002年第3期
论文作者：李凤仪 刘文明 朱光中
Key words：rare earths; n-hexane; aromatization; ZSM-5 catalyst; zeolite;
Abstract: The cracking and aromatization of n-hexane over H-ZSM-5 modified by various rare earths were investigated by means of continuous flow micro-reactor. The surface properties of modified H-ZSM-5 catalysts were obtained from IR, XRD and XPS. The results show that the rare earths enhance the aromatizing properties of the catalysts which are prepared by mechanical mixture method. The results of n-hexane cracking and aromatization are correlated with the acidity. The Brnsted acidic sites are the active sites of n-hexane aromatization, while Lewis acid site plays an important role in n-hexane cracking.
李凤仪1，刘文明1，朱光中2
(1.Institute of Applied Chemistry, Nanchang University, Nanchang 330047, China;
2.Department of Chemistry, Huizhou University, Huizhou 516015, China)
Abstract:The cracking and aromatization of n-hexane over H-ZSM-5 modified by various rare earths were investigated by means of continuous flow micro-reactor. The surface properties of modified H-ZSM-5 catalysts were obtained from IR, XRD and XPS. The results show that the rare earths enhance the aromatizing properties of the catalysts which are prepared by mechanical mixture method. The results of n-hexane cracking and aromatization are correlated with the acidity. The Brnsted acidic sites are the active sites of n-hexane aromatization, while Lewis acid site plays an important role in n-hexane cracking.
Key words:rare earths; n-hexane; aromatization; ZSM-5 catalyst; zeolite;
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