Effect of CeO2 doping on structure and catalytic performance of Co3O4 catalyst for low-temperature CO oxidation
Effect of CeO2 doping on structure and catalytic performance of Co3O4 catalyst for low-temperature CO oxidation
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DOI：
10.1007/s10562-008-9426-4
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发表时间：
2008-07-01
影响因子：
2.8
通讯作者：
Zhao, Yong-Xiang
中科院分区：
文献类型：
--
作者：
Hou, Xiao-Dong;Wang, Yong-Zhao;Zhao, Yong-Xiang
研究了CeO 2掺杂对Co 3 O 4催化剂结构和CO低温氧化催化性能的影响。采用沉淀法制备了Co 3 O 4催化剂，采用浸渍法制备了CeO 2/Co 3 O 4催化剂。用连续流动微反装置考察了它们的催化性能。结果表明，CeO 2/Co 3 O 4催化剂对CO氧化的抗水蒸气中毒性能明显优于Co 3 O 4催化剂。CeO 2/Co 3 O 4催化剂在110 ℃、原料气中含0.6%水蒸气的条件下，可保持CO完全转化8,400 min，而Co 3 O 4催化剂仅能保持100%转化100 min。XRD、TEM和TPR表征表明，CeO 2/Co 3 O 4催化剂具有分散度高、颗粒小、比表面积大等特点，CeO 2和Co 3 O 4之间存在相互作用，这可能是由于CeO 2的掺杂，使其具有优异的耐水性，可用于低温CO氧化。此外，在反应器出口气体中检测到的H-2似乎表明水煤气变换反应是更直接的原因。
The effect of CeO2 doping on structure and catalytic performance of Co3O4 catalyst was studied for low-temperature CO oxidation. The Co3O4 catalyst was prepared by a precipitation method and the CeO2/Co3O4 catalyst was prepared by an impregnation method. Their catalytic performance had been studied with a continuous flowing micro-reactor. The results reveal that the CeO2/Co3O4 catalyst exhibits much better resistance to water vapor poisoning than the Co3O4 catalyst for CO oxidation. The CeO2/Co3O4 catalyst can maintain CO complete conversion at least 8,400 min at 110 degrees C with 0.6% water vapor in the feed gas, while the Co3O4 catalyst can maintain at 100% for only 100 min. Characterizations with XRD, TEM and TPR suggest that the CeO2/Co3O4 catalyst possesses higher dispersion degree, smaller particles and larger S-BET, due to the doping of Ceria, and exists the interaction between CeO2 and Co3O4, which may contribute to the excellent water resistance for low-temperature CO oxidation. Furthermore, the H-2 detected in the reactor outlet gas seems to indicate that the water-gas shift reaction is the more direct reason.