期刊
CATALYSIS SCIENCE & TECHNOLOGY
卷 5, 期 4, 页码 2270-2281出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4cy01553c
关键词
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资金
- Chinese Natural Science Foundation [21263015, 21203088]
- Education Department of Jiangxi Province [GJJ14205, KJLD14005]
- Natural Science Foundation of Jiangxi Province [20142BAB213013]
A high surface area mesoporous La2Sn2O7 compound with a well crystallized pyrochlore structure has been successfully prepared by a simple low temperature hydrothermal (La2Sn2O7-HT) method. As a support for Pd, a catalyst with a significantly higher activity for CO oxidation has been achieved in comparison with the other two non-mesoporous pyrochlores prepared by co-precipitation (La2Sn2O7-CP) and sol-gel (La2Sn2O7-SG) methods. The CO adsorption-desorption and STEM results demonstrate that on Pd/La2Sn2O7-HT, the highest Pd dispersion can be achieved among all of the catalysts. Moreover, compared with Pd/La2Sn2O7-CP and Pd/La2Sn2O7-SG, more active oxygen species were formed on Pd/La2Sn2O7-HT. It is believed that these are the two major reasons accounting for the superior CO oxidation activity of Pd/La2Sn2O7-HT. Furthermore, this catalyst also shows a stable reaction performance in the presence of water vapour. In conclusion, the mesoporous La2Sn2O7-HT pyrochlore is an excellent support for Pd, and has the potential to be applied in some real exhaust control processes.
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