Although CoMn oxides have shown promising catalytic properties in HCHO oxidation, their activities have a large space to improve especially at low temperatures (<70 °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 °C and 40 °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.
|Journal||Applied Catalysis A: General|
|State||Published - Apr 25 2020|
Bibliographical noteFunding Information:
The work was supported by the National Key R&D Program of China (No. 2017YFA0700103 ), National Natural Science Foundation of China (Nos. 21932002 , 21872014 , 21707015 and 21577013 ) and the Fundamental Research Funds for the Central Universities DUT19LK04 .
© 2020 Elsevier B.V.
- Alkali metal doping
- CoMn oxide
- HCHO oxidation
ASJC Scopus subject areas
- Process Chemistry and Technology