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化学学报
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化学学报 ›› 2009, Vol. 67 ›› Issue (2): 109-114. 上一篇    下一篇

研究论文

化学气相沉积法制备Ti/HMS催化剂及甲基接枝改性

李学峰a 王宏胜a 高焕新*,b 陈庆龄b

  

  1. (a许昌学院化学化工学院 许昌 461000)
    (b中国石化上海石油化工研究院 上海 201208)

  • 投稿日期:2008-05-21 修回日期:2008-09-25 发布日期:2009-01-28
  • 通讯作者: 高焕新

Ti/HMS Catalysts Prepared by the Chemical Vapor Deposition Method and Modified by Methyl-grafting

Li, Xuefeng a Wang, Hongsheng a Gao, Huanxin *,b Chen, Qingling b   

  1. (a School of Chemistry and Chemical Engineering of Xuchang University, Xuchang 461000)
    (b Shanghai Research Institute of Petrochemical Technology, Shanghai 201208)
  • Received:2008-05-21 Revised:2008-09-25 Published:2009-01-28
  • Contact: Gao, Huanxin

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被引次数

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用化学气相沉积法制备了Ti/HMS介孔分子筛催化剂, 并对其进行甲基接枝改性. 用XRD、N2-吸附、ICP-AES、FTIR, UV-vis和29Si CP/MAS NMR等手段对样品进行了表征, 考察了催化剂的丙烯环氧化性能. 结果表明: 气相沉积法载钛和接枝改性减小了HMS分子筛表面的孔径和比表面, 但是分子筛的介孔特征仍然保持; 随着沉积时间的增加(0.5～2 h), 催化剂的钛含量逐渐增加, 催化活性也随之增加, 但当沉积时间超过2 h后, 钛含量和催化活性均保持不变; 接枝改性后催化剂的环氧化活性和选择性均显著提高; 气相沉积法合成Ti/HMS比水热法合成Ti-HMS具有更高的环氧化催化活性.

关键词: Ti/HMS催化剂, 化学气相沉积, 甲基接枝, 丙烯环氧化

Ti/HMS mesoporous sieve catalysts were prepared by a chemical vapor deposition method (CVD) and modified by methyl-grafting. The catalysts were characterized by XRD, N2-adsorption, ICP-AES, IR, UV-Vis and 29Si CP/MAS NMR, respectively, and evaluated by the epoxidation of propylene. It was revealed that both the mesopore size and surface area of HMS were decreased after the incorporation of titanium and methyl-grafting treatment, but the mesoporous characteristic was still maintained. Both the titanium content and epoxidation performance were increased with the deposition time (0.5～2 h), and all kept invariable after further deposition. The cumene hydroperoxide (CHP) conversion and the selectivity were all enhanced after the methyl-grafting treatment. Ti/HMS prepared by CVD displays better catalytic activity to epoxidation than Ti-HMS prepared hydrothermally.

Key words: Ti/HMS catalyst, chemical vapor deposition, methyl-grafting, epoxidation of propylene