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Title
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Selective oxidation of CH4 to CH3OH through plasma catalysis : insights from catalyst characterization and chemical kinetics modelling
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Author
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Abstract
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| The selective oxidation of methane to methanol (SOMTM) by molecular oxygen is a holy grail in catalytic chemistry and remains a challenge in chemical industry. We perform SOMTM in a CH4/O2 plasma, at low temperature and atmospheric pressure, promoted by Ni-based catalysts, reaching 81 % liquid oxygenates selectivity and 50 % CH3OH selectivity, with an excellent catalytic stability. Chemical kinetics modelling shows that CH3OH in the plasma is mainly produced through radical reactions, i.e., CH4 + O(1D) → CH3O + H, followed by CH3O + H + M→ CH3OH + M and CH3O + HCO → CH3OH + CO. The catalyst characterization shows that the improved production of CH3OH is attributed to abundant chemisorbed oxygen species, originating from highly dispersed NiO phase with strong oxide support interaction with γ-Al2O3, which are capable of promoting CH3OH formation through E-R reactions and activating H2O molecules to facilitate CH3OH desorption. |
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Language
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English
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Source (journal)
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Applied catalysis : B : environmental. - Amsterdam
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Publication
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Amsterdam
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2021
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ISSN
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0926-3373
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DOI
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10.1016/J.APCATB.2021.120384
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Volume/pages
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296
(2021)
, 11 p.
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Article Reference
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120384
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ISI
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000706860000003
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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Full text (publisher's version - intranet only)
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