等离子体催化团队
New insights into alkaline metal modified CoMn-oxide catalysts for formaldehyde oxidation at low temperatures
发布时间：2020-05-17
点击次数：
论文类型：
期刊论文
第一作者：
Wang, Zhihui
通讯作者：
Yu, LM; Shi, C (reprint author), Dalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Dalian 116024, Peoples R China.
合写作者：
Crocker, Mark,Yu, Limei,Shi, Chuan,Chen, Bingbing
发表时间：
2020-04-25
发表刊物：
APPLIED CATALYSIS A-GENERAL
收录刊物：
SCIE
文献类型：
J
卷号：
596
ISSN号：
0926-860X
关键字：
Alkali metal doping; HCHO oxidation; CoMn oxide
摘要：
Although CoMn oxides have shown promising catalytic properties in HCHO oxidation, their activities have a large space to improve especially at low temperatures ( < 70 degrees C). In the present study, Na or K doping into CoMn oxides was found to greatly enhance the low temperature activities, being one of the most active catalysts among non-noble metal catalysts. Na or K doping into CoMn oxides generates additional surface adsorbed oxygen and the amount of which has a linear relationship with the HCHO oxidation rate at 30 degrees C and 40 degrees C, which gives clear evidence of the crucial roles of surface adsorbed oxygen in HCHO oxidation. What is more, the positive effect of K doping was boosted when H2O was co-existed in the feed gas. The surface hydroxyl species generated from H2O dissociation directly participate in the HCHO oxidation, which provides a low activation energy pathway and increase the low temperature activity.