In situ infrared spectroscopic study of CH4 oxidation over Co-ZSM-5

Mayfair C. Kung; Sean S.Y. Lin; Harold H. Kung

doi:10.1007/s11244-012-9774-6

In situ infrared spectroscopic study of CH₄ oxidation over Co-ZSM-5

Mayfair C. Kung^*, Sean S.Y. Lin, Harold H. Kung

^*Corresponding author for this work

Chemical and Biological Engineering

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

28 Scopus citations

Abstract

Surface species formed in CH₄ activation over Co-ZSM-5 were monitored by in situ DRIFT spectroscopy. IR absorption bands assigned to adsorbed methoxide, formate and polyoxymethylene were detected. The similarities in the IR bands and their evolution during He purge after reactions conducted under anaerobic and aerobic conditions suggested that Cannizzaro disproportionation of formaldehyde is a significant reaction pathway. This was verified when water was found to react with a surface species to form adsorbed formate. Continued formation of surface formate was observed during purging in He which indicated substantial surface storage of formaldehyde as polyoxymethylene.

Original language	English (US)
Pages (from-to)	108-115
Number of pages	8
Journal	Topics in Catalysis
Volume	55
Issue number	1-2
DOIs	https://doi.org/10.1007/s11244-012-9774-6
State	Published - Mar 2012

Keywords

Cannizzaro reaction
Co-ZSM-5
Formaldehyde storage
Methane activation

ASJC Scopus subject areas

Catalysis
Chemistry(all)

Access to Document

10.1007/s11244-012-9774-6

Cite this

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title = "In situ infrared spectroscopic study of CH4 oxidation over Co-ZSM-5",

abstract = "Surface species formed in CH4 activation over Co-ZSM-5 were monitored by in situ DRIFT spectroscopy. IR absorption bands assigned to adsorbed methoxide, formate and polyoxymethylene were detected. The similarities in the IR bands and their evolution during He purge after reactions conducted under anaerobic and aerobic conditions suggested that Cannizzaro disproportionation of formaldehyde is a significant reaction pathway. This was verified when water was found to react with a surface species to form adsorbed formate. Continued formation of surface formate was observed during purging in He which indicated substantial surface storage of formaldehyde as polyoxymethylene.",

keywords = "Cannizzaro reaction, Co-ZSM-5, Formaldehyde storage, Methane activation",

author = "Kung, {Mayfair C.} and Lin, {Sean S.Y.} and Kung, {Harold H.}",

note = "Funding Information: Acknowledgement The project is supported by the DOW Chemical Company via the Methane Challenge. We would like to thank Nirajan Rajkarnikar for help with the set up and initial exploration of the use of the DRIFT reaction chamber for this work.",

year = "2012",

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doi = "10.1007/s11244-012-9774-6",

language = "English (US)",

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T1 - In situ infrared spectroscopic study of CH4 oxidation over Co-ZSM-5

AU - Kung, Mayfair C.

AU - Lin, Sean S.Y.

AU - Kung, Harold H.

N1 - Funding Information: Acknowledgement The project is supported by the DOW Chemical Company via the Methane Challenge. We would like to thank Nirajan Rajkarnikar for help with the set up and initial exploration of the use of the DRIFT reaction chamber for this work.

PY - 2012/3

Y1 - 2012/3

N2 - Surface species formed in CH4 activation over Co-ZSM-5 were monitored by in situ DRIFT spectroscopy. IR absorption bands assigned to adsorbed methoxide, formate and polyoxymethylene were detected. The similarities in the IR bands and their evolution during He purge after reactions conducted under anaerobic and aerobic conditions suggested that Cannizzaro disproportionation of formaldehyde is a significant reaction pathway. This was verified when water was found to react with a surface species to form adsorbed formate. Continued formation of surface formate was observed during purging in He which indicated substantial surface storage of formaldehyde as polyoxymethylene.

AB - Surface species formed in CH4 activation over Co-ZSM-5 were monitored by in situ DRIFT spectroscopy. IR absorption bands assigned to adsorbed methoxide, formate and polyoxymethylene were detected. The similarities in the IR bands and their evolution during He purge after reactions conducted under anaerobic and aerobic conditions suggested that Cannizzaro disproportionation of formaldehyde is a significant reaction pathway. This was verified when water was found to react with a surface species to form adsorbed formate. Continued formation of surface formate was observed during purging in He which indicated substantial surface storage of formaldehyde as polyoxymethylene.

KW - Cannizzaro reaction

KW - Co-ZSM-5

KW - Formaldehyde storage

KW - Methane activation

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