Structure and evolution of confined carbon species during methane Dehydroaromatization by Mo/ZSM-5

Nikolay Kosinov, Evgeny A. Uslamin, Ferdy J.A.G. Coumans, Alexandra S.G. Wijpkema, Roderigh Y. Rohling, Emiel J.M. Hensen

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Abstract

Surface carbon (coke, carbonaceous deposits) is an integral aspect of methane dehydroaromatization catalyzed by Mo/zeolites. We investigated the evolution of surface carbon species from the beginning of the induction period until the complete catalyst deactivation by the pulse reaction technique, TGA, 13C NMR, TEM, and XPS. Isotope labeling was performed to confirm the catalytic role of confined carbon species during MDA. It was found that "hard" and "soft" coke distinction is mainly related to the location of coke species inside the pores and on the external surface, respectively. In addition, MoO3 species act as an active oxidation catalyst, reducing the combustion temperature of a certain fraction of coke. Furthermore, after dissolving the zeolite framework by HF, we found that coke formed during the MDA reaction inside the zeolite pores is essentially a zeolite-templated carbon material. The possibility of preparing zeolite-templated carbons from the most available hydrocarbon feedstock is important for the development of these interesting materials.

Original languageEnglish
Pages (from-to)8459-8467
Number of pages9
JournalACS Catalysis
Volume8
Issue number9
DOIs
Publication statusPublished - 15 Aug 2018

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Zeolites
Methane
Coke
Carbon
Catalyst deactivation
Hydrocarbons
Isotopes
Labeling
Feedstocks
Deposits
X ray photoelectron spectroscopy
Nuclear magnetic resonance
Transmission electron microscopy
Oxidation
Catalysts

Cite this

Kosinov, Nikolay ; Uslamin, Evgeny A. ; Coumans, Ferdy J.A.G. ; Wijpkema, Alexandra S.G. ; Rohling, Roderigh Y. ; Hensen, Emiel J.M. / Structure and evolution of confined carbon species during methane Dehydroaromatization by Mo/ZSM-5. In: ACS Catalysis. 2018 ; Vol. 8, No. 9. pp. 8459-8467.
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Structure and evolution of confined carbon species during methane Dehydroaromatization by Mo/ZSM-5. / Kosinov, Nikolay; Uslamin, Evgeny A.; Coumans, Ferdy J.A.G.; Wijpkema, Alexandra S.G.; Rohling, Roderigh Y.; Hensen, Emiel J.M.

In: ACS Catalysis, Vol. 8, No. 9, 15.08.2018, p. 8459-8467.

Research output: Contribution to journalArticleAcademicpeer-review

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