Coke Deposit Research of Catalytic Dehydration of Ethanol to Ethylene over Phosphorous-Nickel Modified HZSM-5 Catalysts

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Abstract

Ni-Modified HZSM-5 has been developed in our research group. Its channel structure and acid properties were preliminarily modified. Although the higher activity and selectivity has been obtained at 260 ℃, carbon deposit and the short life-span of the catalysts are still the urgent problem to be solved. Based on the Ni-modified HZSM-5 synthesized via ion-exchange method, a series of phosphorus-nickel modified HZSM-5 catalysts were prepared by impregnating the Ni-HZSM-5 with phosphoric acid aqueous solution. The activity of the catalyst was improved to some extent but coke deposit still existed. According to our research, phosphorus was not lost in the process of the reaction, and surface area as well as channel structure was not largely affected by carbon deposit. Characteristic of the catalysts before and after reaction revealed that the deactivation of catalyst resulted from the coverage of acid sites by coke deposit. As the reaction proceeded, the rate of coke formation decreased and the proportion of coke that could be eliminated at relatively high temperature increased. The carbonaceous materials consisted mainly of olefin polymers containing CC, aromatics and some compounds containing ester group.

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	Articles by authors
	Li Xiang
	Liu Zongzhang
	Zhang Minhua
	Li Fengyi

Keywords： ethylene； ethanol； phosphorous-nickel modification； Ni-HZSM-5； coke deposit

Received 2013-11-21;

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Li Xiang, Liu Zongzhang, Zhang Minhua, Li Fengyi.Coke Deposit Research of Catalytic Dehydration of Ethanol to Ethylene over Phosphorous-Nickel Modified HZSM-5 Catalysts[J] Chemcial Industry and Engineering, 2016,V33(1): 15-20

[1] 郭晓亚,颜涌捷,李庭琛,等. 生物质油催化裂解精制中催化剂上焦炭前身物的分析[J]. 华东理工大学学报, 2003, 29(5): 534-536 Guo Xiaoya, YanYongjie, Li Tingshen, et al. Analysis of coke precursor on catalyst used in bio-oil catalytic cracking upgrading[J]. Journal of East China University of Science and Technology, 2003, 29(5): 534-536(in Chinese)
[2] 王飞,罗漫,肖文德. 亚微米HZSM-5催化剂上乙醇脱水及积炭演变过程[J]. 石油学报: 石油加工,2011, 27(5): 712-718 Wang Fei, Luo Man, Xiao Wende. Ethanol dehydrationand coke evolution on a submicron ZSM-5 zeolite[J]. Acta Petrolei Sinica: Petroleum Processing Section, 2011, 27(5): 712-718(in Chinese)
[3] 王飞,罗漫,肖文德. 乙醇脱水制乙烯中亚微米ZSM-5分子筛催化剂的积碳研究[J]. 石油化工, 2011, 40(1): 12-17 Wang Fei, Luo Man, Xiao Wende. Coke behavior of submicron ZSM-5 zeolite catalyst in dehydration of ethanol to ethylene[J]. Petrochemical Technology, 2011, 40(1): 12-17(in Chinese)
[4] 齐国祯,谢在库,刘红星,等. 甲醇制烯烃反应过程中SAPO-34分子筛催化剂的积碳行为研究[J]. 石油化工,2006, 35(1): 29-32 Qi Guozhen, Xie Zaiku, Liu Hongxing, et al. Study on carbon deposition on SAPO-34 molecular sieve catalyst[J]. Petrochemical Technology, 2006, 35(1): 29-32(in Chinese)
[5] Silverstein R M, Webster F X, Kiemle D J, et al. 有机化合物的波谱解析[M]. 药明康德新药开发有限公司分析部译. 上海: 华东理工大学出版社, 2007
[6] 潘峰. Zn/Mn/ZSM-5催化生物乙醇脱水制乙烯的研究[D]. 新疆石河子: 石河子大学,2007
[7] Mao J D, Schimmelmann A, Mastalerz M, et al. Structural features of a bituminous coal and their changes during low-temperature oxidation and loss of volatiles investigated by advanced solid-state NMR spectroscopy[J]. Energy & Fuels, 2010, 24(4): 2 536-2 544
[8] 张华. 有机结构波谱鉴定[M]. 辽宁大连: 大连理工大学出版社, 2009