| 郭建平,伊晓东,吴钟芳,华卫琦,黄传敬,翁维正.铯添加对VOx/SBA-15催化剂丙烷氧化脱氢性能影响[J].分子催化,2011,(5):415-420 |
| 铯添加对VOx/SBA-15催化剂丙烷氧化脱氢性能影响 |
| Effect of cesium loading on catalytic activity of VOx/SBA-15 catalysts for propane oxidative dehydrogenation |
| 投稿时间：2011-09-21 修订日期：2011-09-21 |
| DOI： |
| 中文关键词: 丙烷 氧化脱氢 负载型钒基催化剂 SBA-15 铯 |
| 英文关键词:Propane Oxidative dehydrogenation Vanadia catalylsts SBA-15 Cesium |
| 基金项目:国家重点基础研究发展规划项目（2010CB732300），国家自然科学基金（20803060，21073148），福建省重大科技专项（2009HZ0002-1）和烟台万华聚氨酯股份有限公司科技经费资助 |
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| 中文摘要: |
| 本文考察了碱金属铯的添加对具有单一活性中心（分立的VO4四面体）的VOx/SBA-15催化剂上丙烷氧化脱氢反应性能的影响，发现铯的加入可以显著改善丙烯的选择性。在相同的丙烷转化率时，丙烯选择性提高了~10%。对催化剂的X射线衍射，拉曼光谱，程序升温还原，吡啶吸附IR光谱和程序升温脱附表征结果表明，少量碱金属的加入，并未改变活性中心的结构及其可还原性能，但明显降低了催化剂表面酸量，尤其是B酸量，从而有利于产物丙烯的脱附，抑制了深度氧化产物COx的产生，提高了丙烯的选择性 |
| 英文摘要: |
| The effect of cesium loading on the performance of single-site (pseudotetrahedral monovanadate VO4)VOx/SBA-15 catalysts for propane oxidative dehydrogenation was investigated. The addition of Ce significantly improved the selectivity of propene which was enhanced by ~10 % at the same propane conversions. The catalysts were characterized by XRD，Raman，H2-TPR，NH3-TPD and FT-IR spectroscopy of pyridine adsorption. The results indicated that the addition of a small amount of cesium did not change the structure and reducibility of active centers but resulted in a decrease of Bronsted acid sites which favors propene desorption and prevents the overoxidation of propene to carbon oxides. |
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