Catalytic performance of Ag–Co/CeO₂ catalyst in NO–CO and NO–CO–O₂ system

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• 作者：Hongyan Zhang ; Aimin Zhu ; Xinkui Wang ; Yong Wang ; Chuan Shi
• 关键词：Ag– ; Co/CeO₂ catalyst ; NO ; CO ; Catalytic removal
• 刊名：Catalysis Communications
• 出版年：2007
• 期刊代码：12_15667367
• 类别：ce
• 出版时间：March 2007
• 卷：8
• 期：3
• 页码：612-618
• 文件大小：373 K

摘要

A new bimetallic catalyst (Ag–Co/CeO₂) was studied for simultaneously catalytic removal of NO and CO in the absence or presence of O₂. CeO₂ prepared by homogeneous precipitation method was optimized as supports for the active components. The addition of Ag on CeO₂ greatly improved the catalytic activities in the lower temperature regions (300 °C), and the introduction of Co on CeO₂ increased the activities at higher temperatures (250 °C). The bimetallic Ag–Co/CeO₂ catalyst combined the advantages of the corresponding individual metal supported catalysts and showed superior activity due to the synergetic effect. The effect of support, temperature, loading amount, GHSV and oxygen on catalysis was investigated. NO and CO could be completely removed in the temperature range of 200–600 °C at a very high space velocity of 120 000 h⁻¹. No deactivation was observed over 4%Ag–0.4%Co/CeO₂ catalyst even after 50 h test.