| 双功能WC/HZSM-5催化剂上正己烷芳构化反应性能 |
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| 引用本文： | 施梅勤,陈宁宁,马淳安,李瑛,魏爱平.双功能WC/HZSM-5催化剂上正己烷芳构化反应性能[J].催化学报,2012(3):570-575. |
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| 作者姓名： | 施梅勤 陈宁宁 马淳安 李瑛 魏爱平 |
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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 |
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| 基金项目： | 浙江省国际科技合作重大专项(2008C14040);国际科技合作计划(2010DFB63680);浙江省自然科学基金重点项目(Z4100790);浙江省科技厅科技计划项目(2011R09002-08)~~ |
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| 摘 要： | 以HZSM-5(SiO2/Al2O3=38)为载体,偏钨酸铵为钨源制备了双功能催化剂WC/HZSM-5,考察了其催化正己烷芳构化反应性能,并采用X射线衍射、扫描电子显微镜、X射线能量散射谱和程序升温氨脱附等手段对催化剂进行了表征,探讨了制备方法和WC含量对WC/HZSM-5催化剂性能的影响.结果表明,采用原位还原碳化法制备的WC/HZSM-5(RC)催化剂上正己烷芳构化反应性能优于浸渍法制备的WC/HZSM-5(IP).5%WC/HZSM-5(RC)样品在反应初始阶段芳烃选择性为10.28%,而HZSM-5上的仅为2.56%.WC/HZSM-5(RC)催化剂上反应产物中轻质芳烃(苯、甲苯和二甲苯)含量增加,重质芳烃C9+含量降低,其催化性能优于Pt/HZSM-5催化剂.产物分布的变化可能是由于WC与分子筛间的协同作用所致.
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| 关 键 词： | HZSM-5分子筛 碳化钨 负载型催化剂 正己烷 芳构化 裂解 |
Catalytic Performance of Bi-functional WC/HZSM-5 Catalysts for n-Hexane Aromatization |
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| SHI Meiqina, CHEN Ningning, MA Chun’anb, LI Ying, WEI Aiping.Catalytic Performance of Bi-functional WC/HZSM-5 Catalysts for n-Hexane Aromatization[J].Chinese Journal of Catalysis,2012(3):570-575. |
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| Authors: | SHI Meiqina CHEN Ningning MA Chun’anb LI Ying WEI Aiping |
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| Institution: | State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, College 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: | Bi-functional tungsten carbide (WC) supported on HZSM-5 (WC/HZSM-5) catalyst samples were prepared and studied in n-hexane aromatization. Two series of catalyst samples with varying WC loadings were synthesized by insitu reduction-carbonization (WC/HZSM-5(RC)) and impregnation methods (WC/HZSM-5(IP)). The catalyst samples were characterized by NH3 temperature-programmed desorption, X-ray diffraction, and scanning electron microscopy combined with energy dispersive spectroscopy. The results showed that WC/HZSM-5(RC) has much higher catalytic activity than WC/HZSM-5(IP). The aromatic selectivity on 5%WC/HZSM-5(RC) was 10.28%, which was much higher than that of HZSM-5 (2.56%). The aromatics (benzene, toluene, and xylene) content in liquid products was 85.07%, much higher than that of HZSM-5 (67.71%). These results are interpreted by the bi-functional mechanism due to the synergistic action between the HZSM-5 and WC. |
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| Keywords: | HZSM-5 zeolite tungsten carbide supported catalyst n-hexane aromatization cracking |
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