Frontiers of Chemical Science and Engineering
>> 2012,
Volume 6,
Issue 1
doi:
10.1007/s11705-011-1163-3
RESEARCH ARTICLE
Synthesis and properties of PdO/CeO
School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China
Available online: 2012-03-05
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Abstract
This study focuses on the loading of catalytic materials, e.g., palladium on the surface of supporting materials, with the aim to obtain catalysts with high activity for methane combustion. The catalyst PdO/CeO -Al O was prepared by impregnation under ultrasonic condition. The effect of different activation methods on the activity of catalysts for methane catalytic combustion was tested. The properties of reaction and adsorption of oxygen species on catalyst surface were characterized by H -temperature programmed reduction (H -TPR), and O -temperature programmed desorption (O -TPD). Furthermore, the sulfur tolerance and sulfur poisoning mode were investigated. The results indicate that the catalyst PdO/CeO -Al O activated with rapid activation shows higher activity for methane combustion and better sulfur tolerance. The result of sulfur content analysis shows that there is a large number of sulfur species on the catalyst’s surface after reactivation at high temperature. It proves that the activity of catalysts cannot be fully restored by high-temperature reactivation.
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