Zn 助剂对WC/HZSM-5催化正己烷芳构化性能影响

doi:10.11949/j.issn.0438-1157.20141298

化工学报 ›› 2015, Vol. 66 ›› Issue (2): 553-560.DOI: 10.11949/j.issn.0438-1157.20141298

• 催化、动力学与反应器 • 上一篇下一篇

Zn 助剂对WC/HZSM-5催化正己烷芳构化性能影响

施梅勤, 郑慧新, 魏爱平, 马淳安

浙江工业大学化学工程与材料学院, 绿色化学合成技术国家重点实验室培育基地, 科技部能源材料及应用国际科技合作基地, 浙江杭州 310032

收稿日期:2014-08-27 修回日期:2014-10-29 出版日期:2015-02-05 发布日期:2015-02-05
通讯作者: 马淳安
基金资助:
国际科技合作计划项目(2010DFB63680);国家自然科学基金项目(21376220)。

Effect of zinc additive on n-hexane aromatization over WC/HZSM-5 catalysts

SHI Meiqin, ZHENG Huixin, WEI Aiping, MA Chun'an

State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, School of Chemical Engineering and Materials Science, Zhejiang University of Technology, International Sci. & Tech. Cooperation Base of Energy Materials and Application, Hangzhou 310032, Zhejiang, China

Received:2014-08-27 Revised:2014-10-29 Online:2015-02-05 Published:2015-02-05
Supported by:
supported by the International Science & Technology Cooperation Program of China (2010DFB63680) and the National Natural Science Foundation of China (21376220).

摘要/Abstract

摘要：

以WC/HZSM-5为前驱体制备了一系列不同Zn含量的Zn-WC/HZSM-5催化剂,采用X射线衍射、扫描电子显微镜、N₂物理吸附、傅里叶变换红外光谱和热重分析等手段对Zn-WC/HZSM-5的晶相、形貌、比表面积、酸性质、积炭量等进行了表征,并研究了正己烷芳构化的催化性能,探究了助剂Zn与WC在反应过程中的作用。结果表明,Zn的引入可以提高催化剂的芳烃选择性和芳烃收率。当Zn负载量为1.5%(质量分数)时,所制备的Zn-WC/HZSM-5催化剂芳构化活性最佳,芳烃收率达到36.18%。Zn的引入不仅改变了WC/HZSM-5表面的酸性分布,而且可以减少WC/HZSM-5催化剂的积炭量。

关键词: 碳化钨, HZSM-5, 分子筛, 锌, 催化剂, 正己烷, 芳构化, 活性

Abstract:

A series of Zn-WC/HZSM-5 catalysts with different amounts of Zn additive were prepared based on the precursor WC/HZSM-5. The samples were characterized with X-ray diffraction, scanning electron microscopy, N₂ adsorption-desorption, Fourier transform infrared spectroscopy and thermogravimetric analyzer. Aromatization of n-hexane was evaluated over the Zn-WC/HZSM-5 catalysts in a fixed-bed micro reactor. The role of metal components and the reaction mechanism were studied. Both aromatic selectivity and yield increased with Zn-WC/HZSM-5. Yield increased to 36.18% when the Zn-WC/HZSM-5 displayed the best activity with the concentration of Zn 1.5% (mass). Introduction of Zn into WC/HZSM-5 led to redistribution of acid sites on the surface of catalyst and also caused decrease of coke deposition.

Key words: tungsten carbide, HZSM-5, zeolite, Zn, catalyst, n-hexane, aromatization, reactivity

中图分类号:

O643.36

施梅勤, 郑慧新, 魏爱平, 马淳安. Zn 助剂对WC/HZSM-5催化正己烷芳构化性能影响[J]. 化工学报, 2015, 66(2): 553-560.

SHI Meiqin, ZHENG Huixin, WEI Aiping, MA Chun'an. Effect of zinc additive on n-hexane aromatization over WC/HZSM-5 catalysts[J]. CIESC Journal, 2015, 66(2): 553-560.

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Zn 助剂对WC/HZSM-5催化正己烷芳构化性能影响

Effect of zinc additive on n-hexane aromatization over WC/HZSM-5 catalysts

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