| 陈喜蓉.Ru-La2O3/γ-Al2O3催化剂合成、表征及CO选择性氧化[J].分子催化,2010,(5):0 |
| Ru-La2O3/γ-Al2O3催化剂合成、表征及CO选择性氧化 |
| The preparation, characterization and its catalytic performance of Ru-La2O3/γ-Al2O3 catalysts for CO selective oxidation |
| 投稿时间：2010-05-11 修订日期：2010-07-12 |
| DOI： |
| 中文关键词: 钌催化剂 一氧化碳 选择性氧化 氧化镧 预处理 |
| 英文关键词:Ruthenium catalyst Carbon monoxide Selective oxidation Lanthanum oxide Pretreatment |
| 基金项目:The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan) |
|
| 摘要点击次数: 1572 |
| 全文下载次数: 2387 |
| 中文摘要: |
| 采用浸渍法制备了系列Ru-La2O3/γ-Al2O3复合氧化物催化剂，考察了La2O3 的加入量、预处理方法对催化剂CO选择性氧化反应性能的影响，并通过XRD、H2-TPR、CO-TPR、XPS等手段对催化剂进行了表征。结果表明，添加La的 Ru1La6/Al2O3催化剂在110-170℃时具有99％以上的CO转化率，且催化剂的选择性在55.7%以上。和Ru/Al2O3相比，Ru1La6/Al2O3催化剂在较低温度下具有活性，活性温度区间变宽，适量La2O3的加入提高了钌物种的表面分散性，使催化剂表面活性位点增多，有利于CO的吸附和氧化，提高了催化剂的活性和选择性。和其他方法相比，经氢气预处理后的Ru1La6/Al2O3催化剂活性最佳，催化剂上Ru物种结合能降低，表面钌物种活性位增多，且表面晶格氧浓度增大，更有利于CO气体在催化剂表面上的氧化反应。 |
| 英文摘要: |
| The Ru-La2O3/γ-Al2O3 mixed oxides with various La2O3contents were prepared by impregnation method for selective CO oxidation and characterized by XRD, XPS,H2-TPR,CO-TPR techniques. Effects of the La2O3 loading and different pretreatments on the activity of Ru-La2O3/Al2O3 catalysts were studied. The results showed that higher CO conversion (>99%) and selectivity（>55.7%） in wider temperature range（110-170℃） were obtained when the catalyst composition was Ru1La6/Al2O3. The doping of La2O3 improves the dispersion degree of Ru species，increases the active sites , advances the adsorption and reaction of oxygen and carbon monoxide，then enhances the catalytic activity. The Ru1La6/Al2O3 catalyst pretreated in hydrogen exhibits the better catalytic performance compared with other methods. After pretreated by hydrogen atmosphere ,the binding energy of Ru species of catalyst decreases, and the amounts of surface Ru species and surface lattice oxygen concentration increases, which is benefit to the oxidation reaction of CO gas in on the surface of the catalyst. |
| HTML 查看全文 查看/发表评论 下载PDF阅读器 |
