| 秦毅红,孙立国,张党龙,黄磊.LaxSr1-xFeO3催化剂的制备及其催化还原SO2性能的研究[J].分子催化,2016,30(1):54-61 |
| LaxSr1-xFeO3催化剂的制备及其催化还原SO2性能的研究 |
| Preparation of LaxSr1-xFeO3 Catalyst and Its Performance for Catalytic Reduction of SO2 with CO |
| 投稿时间：2016-01-08 修订日期：2016-01-24 |
| DOI： |
| 中文关键词: 柠檬酸络合 钙钛矿 催化还原 氧空位 掺杂 |
| 英文关键词:Citric acid complex Perovskite Catalytic reduction Oxygen vacancy Substitution |
| 基金项目: |
|
| 摘要点击次数: 1509 |
| 全文下载次数: 3326 |
| 中文摘要: |
| 采用柠檬酸络合溶胶凝胶法制备了不同La、Sr比例的LaxSr1-xFeO3催化剂样品，通过X射线衍射（XRD）、比表面积测定（BET）、CO-程序升温还原（CO-TPR）、SO2-程序升温脱附（SO2-TPD）、O2-程序升温脱附（O2-TPD）的方法对催化剂的结构和物理化学性质进行了表征。综合表征结果分析，通过柠檬酸络合法成功制得了具有典型钙钛矿结构的LaxSr1-xFeO3系列复合氧化物；在LaFeO3的结构中A位（La）掺杂替换少量的Sr，可以增大催化剂的比表面积、提高氧化物结构中氧空位的数量、促进反应气体在催化剂中完成反应，大大提升了SO2的催化还原转化效率。实验结果表明，当x为0.8时，CO催化还原SO2的转化率最高，在空速为24000mL/(g?h)，温度600℃时，转化率达到95%，取得了良好的催化效果。 |
| 英文摘要: |
| a series of LaxSr1-xFeO3 catalysts was prepared by a citric acid sol-gel method, and the structural and physicochemical properties of catalysts were characterized by X-ray powder diffraction (XRD), BET surface area, CO temperature-programmed reduction (CO-TPR), SO2 temperature-programmed desorption (SO2-TPD), O2 temperature-programmed desorption (O2-TPD). The XRD results showed that the LaxSr1-xFeO3 samples prepared by citric acid sol-gel method had the typical perovskite structure. A small amount of Sr2 substituted La3 in A-site increased the BET surface area and oxygen vacancy of the catalyst. In addition, the substitution promoted the CO and SO2 enter the LaxSr1-xFeO3 lattice, which improved the SO2 conversion rate. Of all of these catalysts, the La0.8Sr0.2FeO3 exhibited the best performance in catalytic reduction SO2 with CO. When temperature was 600℃, space velocity(GHSV) was 24000mL/(g?h), the conversion rate raised to 95%, achieved good results. |
| HTML 查看全文 查看/发表评论 下载PDF阅读器 |
