文献类型：期刊文献

英文题名：The effect of preparation method on the activities of Pd-Fe-Ox/Al 2O3 catalysts for CO oxidation

作者：Cai, Lili[1]; Lu, Guanzhong[1]; Zhan, Wangcheng[1]; Guo, Yun[1]; Guo, Yanglong[1]; Yang, Qingshan[1]; Zhang, Zhigang[1]

机构：[1] Lab for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai 200237, China

年份：2011

卷号：46

期号：17

起止页码：5639

外文期刊名：Journal of Materials Science

收录：EI(收录号：20112414056626)

语种：英文

外文关键词：Catalytic oxidation - Mixtures - Impregnation - Iron compounds - Temperature programmed desorption - X ray photoelectron spectroscopy - Catalyst activity - X ray diffraction - Sol-gels - Sol-gel process - Palladium

摘要：The Pd-Fe-Ox/Al2O3 catalysts were prepared by co-impregnation (co-Pd-Fe-Ox/Al2O3) and sol-gel method (sol-gel-Pd-Fe-Ox/Al2O3) and characterized by N 2 adsorption-desorption, X-ray diffraction (XRD), H 2-temperature programmed reduction (H2-TPR), and X-ray photoelectron spectroscopy (XPS). The CO catalytic oxidation was investigated over Pd-Fe-Ox/Al2O3 catalysts prepared by different methods. The 100% conversion temperature (T 100) over pre-reduced co-Pd-Fe-Ox/Al2O3 (co-Pd-Fe-Ox/Al2O 3-R) and pre-reduced sol-gel-Pd-Fe-Ox/Al2O3 (sol-gel-Pd-Fe-Ox/Al2O3-R) is 90 and 25 °C when fed with the reaction mixture containing 1 vol.% CO and a balance of air, respectively. XRD results indicate that the sol-gel method is favorable for the high dispersion of PdO particles compared with co-impregnation method. H 2-TPR results suggest that the interaction between Pd and Fe is existent over both sol-gel-Pd-Fe-Ox/Al2O3 and co-Pd-Fe-Ox/Al2O3 catalysts, while the interaction in former catalyst is stronger than that in the latter. The XPS results show that the Pd species on the surface of both sol-gel-Pd-Fe-Ox/Al2O 3-R and co-Pd-Fe-Ox/Al2O3-R catalysts are the mixture of oxide and metal state, leading to the high activity for CO oxidation. Furthermore, the different Pd2+/Pd0 ratio may be the reason for the different activity between sol-gel-Pd-Fe-Ox/Al2O 3-R and reduced co-Pd-Fe-Ox/Al2O3-R catalysts. ? 2011 Springer Science+Business Media, LLC.