| Zn 助剂对WC/HZSM-5催化正己烷芳构化性能影响 |
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| 引用本文： | 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. DOI: 10.11949/j.issn.0438-1157.20141298 |
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| 作者姓名： | 施梅勤 郑慧新 魏爱平 马淳安 |
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| 作者单位： | 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 |
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| 基金项目： | 国际科技合作计划项目(2010DFB63680)；国家自然科学基金项目(21376220)。 |
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| 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。
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| 关 键 词： | 碳化钨 HZSM-5 分子筛 锌 催化剂 正己烷 芳构化 活性 |
| 收稿时间： | 2014-08-27 |
| 修稿时间： | 2014-10-29 |
Effect of zinc additive on n-hexane aromatization over WC/HZSM-5 catalysts |
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| SHI Meiqin,ZHENG Huixin,WEI Aiping,MA Chun'an. Effect of zinc additive on n-hexane aromatization over WC/HZSM-5 catalysts[J]. Journal of Chemical Industry and Engineering(China), 2015, 66(2): 553-560. DOI: 10.11949/j.issn.0438-1157.20141298 |
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| Authors: | SHI Meiqin ZHENG Huixin WEI Aiping MA Chun'an |
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| Affiliation: | 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 |
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| 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. |
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| Keywords: | tungsten carbide HZSM-5 zeolite Zn catalyst n-hexane aromatization reactivity |
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