New insights into alkaline metal modified CoMn-oxide catalysts for formaldehyde oxidation at low temperatures

Zhihui Wang; Bingbing Chen; Mark Crocker; Limei Yu; Chuan Shi

doi:10.1016/j.apcata.2020.117512

New insights into alkaline metal modified CoMn-oxide catalysts for formaldehyde oxidation at low temperatures

Zhihui Wang, Bingbing Chen, Mark Crocker, Limei Yu, Chuan Shi

Research output: Contribution to journal › Article › peer-review

28 Scopus citations

Abstract

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.

Original language	English
Article number	117512
Journal	Applied Catalysis A: General
Volume	596
DOIs	https://doi.org/10.1016/j.apcata.2020.117512
State	Published - Apr 25 2020

Bibliographical note

Funding 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 .

Publisher Copyright:
© 2020 Elsevier B.V.

Keywords

Alkali metal doping
CoMn oxide
HCHO oxidation

ASJC Scopus subject areas

Catalysis
Process Chemistry and Technology

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10.1016/j.apcata.2020.117512

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title = "New insights into alkaline metal modified CoMn-oxide catalysts for formaldehyde oxidation at low temperatures",

abstract = "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.",

keywords = "Alkali metal doping, CoMn oxide, HCHO oxidation",

author = "Zhihui Wang and Bingbing Chen and Mark Crocker and Limei Yu and Chuan Shi",

note = "Funding 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 . Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",

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AU - Wang, Zhihui

AU - Chen, Bingbing

AU - Crocker, Mark

AU - Yu, Limei

AU - Shi, Chuan

N1 - Funding 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 . Publisher Copyright: © 2020 Elsevier B.V.

PY - 2020/4/25

Y1 - 2020/4/25

N2 - 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.

AB - 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.

KW - Alkali metal doping

KW - CoMn oxide

KW - HCHO oxidation

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New insights into alkaline metal modified CoMn-oxide catalysts for formaldehyde oxidation at low temperatures

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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