Highly efficient formaldehyde elimination over meso-structured M/CeO2 (M = Pd, Pt, Au and Ag) catalyst under ambient conditions
Highly efficient formaldehyde elimination over meso-structured M/CeO2 (M = Pd, Pt, Au and Ag) catalyst under ambient conditions
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DOI：
10.1039/c5ra04928h
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发表时间：
2015-01-01
期刊：
影响因子：
3.9
通讯作者：
Li, Liang
中科院分区：
文献类型：
--
作者：
Li, Gengnan;Li, Liang
采用表面热解和原位还原法制备了一系列介孔CeO 2负载贵金属（Pt、Pd、Au和Ag）催化剂，并将其用于室温下的甲醛消除反应.该材料具有较高的比表面积和均匀分散的贵金属纳米粒子，对甲醛氧化具有很高的催化活性。当贵金属负载量为1wt%时，Pt/CeO 2、Pd/CeO 2和Au/CeO 2催化剂在室温下均能完全催化氧化甲醛。即使对于低活性的Ag/CeO 2催化剂，完全转化温度也可以达到100 ℃，远低于以前报道的温度。这种良好的催化性能可归因于活性组分与CeO 2纳米晶聚集体载体之间的强协同作用。通过原位DRIFTS分析，探讨了贵金属/CeO 2催化剂上的反应机理。
A series of mesoporous CeO2 supported noble metal (Pt, Pd, Au and Ag) catalysts, fabricated through a facial pyrolysis and in situ reduction protocol, were used for formaldehyde elimination under ambient conditions. The materials possessed relatively high specific surface area and uniformly dispersed noble metal nanoparticles, and showed very high catalytic activities for formaldehyde oxidation. For about 1 wt% noble metal loaded materials, Pt/CeO2, Pd/CeO2 and Au/CeO2 catalysts could completely catalytically oxidize HCHO at room temperature. Even for the low activity Ag/CeO2 catalyst, the complete conversion temperature could reach 100 degrees C, much lower than that reported before. Such good catalytic properties could be attributed to the strong synergetic interaction between the active component and CeO2 nano-crystalline aggregated support. The reaction mechanism over the noble-metal/CeO2 catalyst was also discussed through in situ DRIFTS analysis.