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

45 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

Publisher Copyright:
© 2020 Elsevier B.V.

Funding

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 .

Funders	Funder number
National Natural Science Foundation of China (NSFC)	21577013, 21707015, 21872014, 21932002
National Key Research and Development Program of China	2017YFA0700103
Fundamental Research Funds for the Central Universities	DUT19LK04

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

Cite this

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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",

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doi = "10.1016/j.apcata.2020.117512",

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T1 - New insights into alkaline metal modified CoMn-oxide catalysts for formaldehyde oxidation at low temperatures

AU - Wang, Zhihui

AU - Chen, Bingbing

AU - Crocker, Mark

AU - Yu, Limei

AU - Shi, Chuan

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

Funding

Keywords

ASJC Scopus subject areas

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