Catalytic conversion of n-butane over Au-Zn-modified nano-sized HZSM-5

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• 作者：Nu La Hong AI SHA¡¤ ; Jiaxu LIU ; Ning HE ; Hongchen GUO
• 关键词：Gold ; Zinc ; HZSM-5 zeolite ; n-Butane conversion ; Dehydrogenation ; Aromatization ; Nano-gold particle ; Deposition-precipitation
• 刊名：Chinese Journal of Catalysis
• 出版年：2013
• 出版时间：June, 2013
• 年：2013
• 卷：34
• 期：6
• 页码：1262-1266
• 全文大小：654 K

文摘

An Au-Zn-modified HZSM-5 catalyst was prepared using deposition-precipitation and wet impregnation methods. To obtain a better understanding of the relationship between catalyst characteristics and catalytic performance, a thorough study of various catalyst samples (HZSM-5, Au/HZSM-5, Zn/HZSM-5, and Au-Zn/HZSM-5) was performed. The interactions between Au and Zn species in Au-Zn/HZSM-5 were determined using ultraviolet-visible and X-ray photoelectron spectroscopies. Compared with Zn/HZSM-5, the introduction of Au to give Au-Zn/HZSM-5 effectively promotes the dehydrogenation and aromatization of n-butane, and also suppresses hydrogenolysis over Zn species. The n-butane conversion (70.8 % ) and selectivity for olefins and aromatics (61.98 % ) increased significantly. The dry gas selectivity also decreased significantly to 28.4 % . Au-Zn-containing HZSM-5 is a useful catalyst for the conversion of light alkanes.