铈对 Pd-Pt/Al2O3 催化剂甲烷催化燃烧性能的影响。
Effects of Ce on catalytic combustion of methane over Pd-Pt/Al2O3 catalyst.
机构信息
School of Chemistry and Environment, Beihang University, Beijing 100191, China.
出版信息
J Environ Sci (China). 2012;24(3):507-11. doi: 10.1016/s1001-0742(11)60798-5.
Activity and stability of 1%Pd-0.2%Pt/Al2O3 and 1%Pd-0.2%Pt/0.6%Ce/Al2O3 catalysts prepared by impregnation method for catalytic combustion of methane in air were investigated. The catalysts before and after reaction were characterized by BET, CO chemisorption, XRD and XP S techniques. Results showed that the presence of Ce significantly increased the activity and thermal stability of the Pd-Pt/Al2O3 catalyst towards methane combustion, which could be attributed to more highly-dispersed active PdO particles over the Pd-Pt/Ce/Al2O3 catalyst surface as well as the retarded sintering of PdO and the maintained oxidized state of surface Pd during the combustion process in the presence of Ce.
采用浸渍法制备了 1%Pd-0.2%Pt/Al2O3 和 1%Pd-0.2%Pt/0.6%Ce/Al2O3 催化剂，并用于甲烷在空气中的催化燃烧反应，考察了它们的活性和稳定性。采用 BET、CO 化学吸附、XRD 和 XPS 等技术对反应前后的催化剂进行了表征。结果表明，Ce 的存在显著提高了 Pd-Pt/Al2O3 催化剂对甲烷燃烧的活性和热稳定性，这归因于 Pd-Pt/Ce/Al2O3 催化剂表面上高度分散的活性 PdO 颗粒以及 Ce 的存在使得在燃烧过程中 PdO 的烧结得到延缓，表面 Pd 的氧化态得以保持。
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