Improvement of sulfur resistance of Pd/Ce-Zr-Al-O catalysts for CO oxidation
Improvement of sulfur resistance of Pd/Ce-Zr-Al-O catalysts for CO oxidation
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DOI：
10.1016/j.apsusc.2017.05.198
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发表时间：
2018-01
影响因子：
6.7
通讯作者：
Haebin Shin;Minsung Baek;Youngsoo Ro;C. Song;K. Lee;I. Song
中科院分区：
文献类型：
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作者：
Haebin Shin;Minsung Baek;Youngsoo Ro;C. Song;K. Lee;I. Song
Two kinds of mesoporous ceria-zirconia-alumina supports were prepared by a single-step epoxide-driven sol-gel method (SGCZA) and by a co-precipitation method (PCZA). Palladium catalysts supported on these materials were then prepared by a wet impregnation method (Pd/SGCZA and Pd/PCZA). The prepared catalysts were applied to the CO oxidation reaction before and after sulfur aging. XRD and N2adsorption-desorption analyses revealed that these two catalysts retained different physicochemical properties. Pd/SGCZA had higher surface area and larger pore volume than Pd/PCZA before and after sulfur aging. TPR (Temperature-programmed reduction), CO chemisorption, FT-IR, and XPS analyses showed that the catalysts were differently influenced by sulfur species. Pd/SGCZA formed less sulfate and retained higher palladium dispersion than Pd/PCZA after sulfur aging. In the CO oxidation, Pd/PCZA showed better activity than Pd/SGCZA before sulfur aging. However, Pd/SGCZA showed higher CO conversion than Pd/PCZA after sulfur aging. We concluded that Pd/SGCZA was less poisoned by sulfur species than Pd/PCZA.
