Direct non-oxidative methane coupling on vitreous silica supported iron catalysts

Direct non-oxidative methane coupling (NMC) is one of the promising pathways for methane upgrading into value-added olefin and aromatic hydrocarbons. The silica-supported iron (i.e., Fe/SiO2) catalyst has been reported effective for NMC, but the effects of silica support on the catalyst property and...

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Bibliographic Details
Published in:Catalysis today 2022-08, Vol.416 (C)
Main Authors: Liu, Zixiao, Cheng, Sichao, Schulman, Emily, Chen, Weiqi, Vlachos, Dionisios G., Shu, Yuying, Tran, Dat T., Liu, Dongxia
Format: Article
Language:English
Subjects:
Chemistry
Cristobalite
Engineering
Flame fusion
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Natural gas
Non-oxidative methane coupling
Vitreous silica
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Summary:Direct non-oxidative methane coupling (NMC) is one of the promising pathways for methane upgrading into value-added olefin and aromatic hydrocarbons. The silica-supported iron (i.e., Fe/SiO2) catalyst has been reported effective for NMC, but the effects of silica support on the catalyst property and NMC performance have rarely been explored. Here, in this work, we prepared a vitreous silica-supported iron (Fe/SiO2-V) catalyst by flame fusion of a mixture of quartz silica and fayalite. The physicochemical properties and NMC performance of the as-prepared catalysts were measured. Compared to crystalline cristobalite support in Fe/SiO2 catalyst that has been studied previously, vitreous silica support has disordered Si-O bonds and structural defects, enabling better iron dispersion and more vital metal-support interaction. The as-prepared Fe/SiO2-V catalyst had a shorter induction period in methane activation and lower coke yield in NMC. The increase in iron concentration in Fe/SiO2-V catalysts elongated the catalyst induction period and promoted aromatics and coke formation. The coke type of the spent Fe/SiO2-V catalyst is more uniform than the cristobalite-supported iron catalyst.
ISSN:0920-5861