在色谱-微反流动法实验装置上考察了负载Sm2O3对CuO-γ-Al2O3催化剂CO氧化活性的影响, 并运用X射线衍射(XRD)、程序升温还原(TPR)及程序升温脱附(TPD-MS)技术研究了Sm2O3对CuO-γ-Al2O3催化剂的物相结构、氧化还原特性及表面氧的脱附与恢复行为的影响. 结果表明, 负载适量的Sm2O3对CuO-γ-Al2O3催化剂表面氧的脱出与恢复有促进作用, 可使部分γ-Al2O3相变成γ-Al2O3和θ-Al2O3的混合型. 负载适量的Sm2O3能改善催化活性, 而负载过量的Sm2O3则使CuO催化剂上CuO的晶粒增大, 从而对催化活性起了抑制作用.
参考文献
| [1] | Rosynck M P .Catalytic properties of rare earth oxides[J].Journal of Catal Rev Sci Eng,1977,16(01):111. |
| [2] | 卢冠忠;汪仁 .氧化铈在非贵金属氧化物催化剂中的作用. I.铜和铈负载型氧化物中的氧的性质[J].催化学报,1991,12(02):83. |
| [3] | Tascon J M;Tejuca L G;Rochester C H .Surface interactions of NO and CO with LaMO3 oxides[J].Journal of Catalysis,1985,95(02):558. |
| [4] | Hegedus L L;Summers J C;Schlatter J C et al.Poison-resistant catalysts for the simultaneous control of hydrocarbon,carbon monoxide and nitrogenoxide emissions[J].Journal of Catalysis,1979,56:321. |
| [5] | Tao H C;Yao Y F .Ceria in automotive exhaust catalysts. I. Oxygen storage[J].Journal of Catalysis,1984,86:254. |
| [6] | Jiang Xiaoyuan;Zhou Renxian;Zheng Xiaoming et al.Effect of the addition of La2O3 on TPR and TPD of CuO/γ-Al2O3 catalysts[J].Applied Catalysis A:General,1997,150:131. |
| [7] | Jiang Xiaoyuan;Zhou Renxian;Zheng Xiaoming et al.Effect of ceria on copper/alumina catalysts for carbon monoxide and n-hexane oxidation[J].Journal of Environmental Sciences,1996,8(02):145. |
| [8] | 郑小明;朱逸飞;周烈华 .V2O5/SiO2催化剂表面氧的性质[J].催化学报,1996,7(01):82. |
| [9] | Paetow H;Riekert L .The catalytic activity of copper-exchanged zeolites as compared to copper oxides[J].Journal of Acta Chem,1980,21:245. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%