Oxidative Coupling of CH4 on Supported Na2WO4 Promoted with Transition Metals (M = Co, Mn, Mo)

Oxidative coupling of methane (OCM) is a promising process of direct transformation of CH 4 to ethylene instead of a complicated two-step process in terms of first forming syngas through reforming or partial oxidation and then producing ethylene with Fischer–Tropsch synthesis (FTS). Na 2 WO 4 has be...

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Bibliographic Details
Published in:Catalysis letters 2024-05, Vol.154 (5), p.2140-2150
Main Authors: Li, Yuting, Tang, Yu, Li, Yixiao, Tao, Franklin
Format: Article
Language:English
Subjects:
Catalysis
Catalysts
Catalytic activity
Chemistry
Chemistry and Materials Science
Coupling
Ethane
Ethylene
Fine structure
Fischer-Tropsch process
High temperature
Industrial Chemistry/Chemical Engineering
Metals
Methane
Molybdenum
Organometallic Chemistry
Oxidation
Physical Chemistry
Reforming
Sodium tungstate
Spectrum analysis
Synthesis gas
Transition metals
X ray absorption
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Summary:Oxidative coupling of methane (OCM) is a promising process of direct transformation of CH 4 to ethylene instead of a complicated two-step process in terms of first forming syngas through reforming or partial oxidation and then producing ethylene with Fischer–Tropsch synthesis (FTS). Na 2 WO 4 has been one of the most studied catalysts of OCM. Here we investigated how the introduced transition metal elements Co, Mn, or Mo to Na 2 WO 4 could influence the catalytic performance of OCM on the supported Na 2 WO 4 . It is found that Co, Mn and Mo can obviously promote catalytic activity of transforming CH 4 and selectivity for producing ethylene and ethane in OCM performed on Na 2 WO 4 supported on microporous silicate-1 (S-1). A similar promotion of Co, Mn and Mo to the catalytic activity and selectivity in OCM performed on Na 2 WO 4 was found when the Na 2 WO 4 was supported on Matériaux de l′Institut Lavoisier-53(Al) [MIL-53(Al)]. X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) spectroscopy studies of these catalysts with added transition metal Co, Mn or Mo show that these metals diffused into the lattice of Na 2 WO 4 , further suggesting that the promotional effect likely arises from modification of the active phase of the supported Na 2 WO 4 during OCM. Graphical Abstract
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-023-04461-5