| MoO3/TiO2纳米复合催化剂的合成及催化脱氢性能 |
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| 引用本文： | 蔡炳新,詹拥共,杨莹莹,郭栋才,刘玉章.MoO3/TiO2纳米复合催化剂的合成及催化脱氢性能[J].化工学报,2007,58(6):1451-1456. |
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| 作者姓名： | 蔡炳新 詹拥共 杨莹莹 郭栋才 刘玉章 |
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| 作者单位： | 湖南大学化学化工学院 |
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| 摘 要： | 采用溶胶-凝胶法合成MoO3/TiO2、K2O-MoO3/TiO2、V2O5-MoO3/TiO2、Al2O3-MoO3/TiO2、K2O-V2O5-MoO3/TiO2系列纳米催化剂。借助TEM、XRD、IR等技术对催化剂进行了表征，并利用环己烷催化氧化脱氢成环己烯的反应进行活性测试。结果表明，MoO3在载体TiO2呈单层和多层分布，单层分布时发生了Mo与O—Ti的键合作用，同时使TiO2表面水分子发生解离反应，活化时脱去—OH产生Mo6+和Mo—O-活性中心;多层分布时以MoFY=，1]O、Mo—O-活性物种为主。脱氢中心和供氧中心之间存在协同作用，K、Al、V均能影响其协同作用。
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| 关 键 词： | 纳米催化剂 合成 环己烷 环己烯 活性物种 |
| 文章编号： | 0438-1157（2007）06-1451-06 |
| 收稿时间： | 2006-9-13 |
| 修稿时间： | 2006-09-132007-03-27 |
Synthesis and catalytic dehydrogenation properties of MoO3/TiO2 complex nanocatalyst |
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| CAI Bingxin,ZHAN Yonggong,YANG Yingying,GUO Dongcai,LIU Yuzhang.Synthesis and catalytic dehydrogenation properties of MoO3/TiO2 complex nanocatalyst[J].Journal of Chemical Industry and Engineering(China),2007,58(6):1451-1456. |
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| Authors: | CAI Bingxin ZHAN Yonggong YANG Yingying GUO Dongcai LIU Yuzhang |
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| Affiliation: | School of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, Hunan, China |
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| Abstract: | A series of MoO3/TiO2，K2O-MoO3/TiO2，V2O5-MoO3/TiO2，Al2O3-MoO3/TiO2 and K2O-V2O5-MoO3/TiO2 were prepared by the sol-gel method，and characterized with TEM，XRD and IR.The catalytic activity of oxydehydrogenation of cyclohexane to cyclohexene was tested.The results showed that MoO3 was distributed on the carrier of TiO2 with monolayer or/and multilayer.The Mo in the monolayer was bonded with O—Ti structure，and caused dissociation of the water molecules on the surface of TiO2，and the activity centre of Mo6+ and Mo—O- species were formed by means of activation to eliminate the hydroxyl group.For the multilayer structure the main active species were MoFY=，1]O and Mo—O-.A synergetic effect existed between the dehydrogenation centre and the oxygen-supply centre，and was affected by the addition of K，Al or V. |
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| Keywords: | nanocatalyst synthesis cyclohexane cyclohexene active species |
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