| 硅烷化对Ti/HMS分子筛催化性能的影响 |
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| 引用本文： | 李学峰,高焕新,金国杰,丁琳,陈璐,杨洪云,何欣,陈庆龄. 硅烷化对Ti/HMS分子筛催化性能的影响[J]. 催化学报, 2007, 28(6): 551-556 |
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| 作者姓名： | 李学峰 高焕新 金国杰 丁琳 陈璐 杨洪云 何欣 陈庆龄 |
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| 作者单位： | 华东理工大学化学与分子工程学院,上海,200237;中国石化上海石油化工研究院,上海,201208;华东理工大学化学与分子工程学院,上海,200237;中国石化上海石油化工研究院,上海,201208 |
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| 基金项目： | 国家重点基础研究发展计划(973计划) |
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| 摘 要： | 分别用水热法和气相沉积法制备了Ti/HMS分子筛,采用三甲基氯硅烷(TMCS)和六甲基二硅氮烷(HMDSZ)对Ti/HMS样品进行了气相硅烷化,并用X射线衍射、N2吸附、红外光谱、29Si核磁共振和紫外-可见光谱对样品进行了表征.丙烯环氧化反应的测定结果表明,硅烷化可显著提高环氧化催化活性.水热法制备的Ti/HMS经HMDSZ硅烷化后的催化活性比经TMCS硅烷化后的稍高;气相沉积法制备的Ti/HMS经HMDSZ硅烷化后的催化活性远高于经TMCS硅烷化后的催化活性.这是由于TMCS不但能与分子筛表面的硅羟基反应,而且能破坏分子筛骨架中的Si-O-Ti甚至Si-O-Si键,形成新的羟基,导致样品的亲水性较强,同时还能对气相沉积法制备的Ti/HMS中的四配位骨架钛产生破坏作用.
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| 关 键 词： | 钛 HMS分子筛 水热合成 气相沉积 硅烷化 丙烯 环氧化 |
| 文章编号： | 0253-9837（2007）06-0551-06 |
| 修稿时间： | 2006-12-08 |
Influence of Silylation on Catalytic Performance of Ti/HMS Molecular Sieve |
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| LI Xuefeng,GAO Huanxin,JIN Guojie,DING Lin,CHEN Lu,YANG Hongyun,HE Xin,CHEN Qingling. Influence of Silylation on Catalytic Performance of Ti/HMS Molecular Sieve[J]. Chinese Journal of Catalysis, 2007, 28(6): 551-556 |
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| Authors: | LI Xuefeng GAO Huanxin JIN Guojie DING Lin CHEN Lu YANG Hongyun HE Xin CHEN Qingling |
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| Affiliation: | 1 School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China; 2 Shanghai Research Institute of Petrochemical Technology, SINOPEC , Shanghai 201208, China |
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| Abstract: | Ti/HMS samples were prepared by hydrothermal synthesis(HTS)and chemical vapor deposition(CVD)methods and then silylated by trimethylchlorosilane(TMCS)and hexamethyldisilazane(HMDSZ)in a vapor phase.The samples were characterized by XRD,N2 adsorption,FT-IR,29Si NMR,and DRUV-Vis,and their catalytic performance for the epoxidation of propylene using cumene hydroperoxide as oxidant was measured.The silylation could promote remarkably the catalytic performance.The Ti/HMS silylated by HMDSZ had much higher catalytic activity than that silylated by TMCS.This is because TMCS could not only react with silanol but also break Si-O-Ti and Si-O-Si bonds to form new silanol,which led to higher hydrophilicity for the silylated samples than those silylated by HMDSZ.The silylation with TMCS partially destroyed the tetracoordinated framework titanium species in Ti/HMS,but this did not occur in the silylation with HMDSZ. |
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| Keywords: | titanium HMS molecular sieve hydrothermal synthesis chemical vapor deposition silylation propylene epoxidation |
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