期刊
APPLIED CATALYSIS A-GENERAL
卷 596, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcata.2020.117512
关键词
Alkali metal doping; HCHO oxidation; CoMn oxide
资金
- National Key R&D Program of China [2017YFA0700103]
- National Natural Science Foundation of China [21932002, 21872014, 21707015, 21577013]
- Fundamental Research Funds for the Central UniversitiesDUT19LK04
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.
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