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

Journal Article · · Catalysis Today
 [1];  [2];  [2];  [3];  [3];  [4];  [5];  [2]
  1. Univ. of Maryland, College Park, MD (United States); OSTI
  2. Univ. of Maryland, College Park, MD (United States)
  3. Univ. of Delaware, Newark, DE (United States)
  4. W.R. Grace and Company, Columbia, MD (United States)
  5. Army Research Laboratory, Adelphi, MD (United States)

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.

Research Organization:
Univ. of Maryland, College Park, MD (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy and Carbon Management (FECM)
Grant/Contract Number:
FE0031877
OSTI ID:
2418225
Journal Information:
Catalysis Today, Journal Name: Catalysis Today Journal Issue: C Vol. 416; ISSN 0920-5861
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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