期刊
ACS CATALYSIS
卷 11, 期 16, 页码 10288-10293出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.1c02315
关键词
Mn-Na2WO4/SiO2 catalyst; oxidative coupling of methane (OCM); lattice oxygen; dissolved oxygen; molten salt; temporal analysis of products (TAP)
资金
- U.S. Department of Energy (USDOE), Office of Energy Efficiency and Renewable Energy (EERE), Advanced Manufacturing Office Next Generation RD Projects [DE-AC07-05ID14517]
- National Science Foundation (NSF) Chemical, Bioengineering, Environment and Transport Systems (CBET) [1706581]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1706581] Funding Source: National Science Foundation
This study reveals that supported Na2WO4/SiO2 catalysts possess two different types of oxygen species, dissolved O-2 and atomic O, at an OCM-relevant temperature. The addition of Mn-oxide increases the total amount and release rate of dissolved O-2 species and improves C-2 selectivity of both dissolved O-2 and atomic lattice O species.
The involvement of lattice oxygen species is important toward oxidative coupling of the methane reaction (OCM) over supported Mn-Na2WO4/SiO2 catalysts, but there is no consensus regarding the types, role, and origin of lattice oxygen species present in supported Mn-Na2WO4/SiO2 catalysts, which hinders the understanding of the OCM reaction network. In the present study, by utilizing the temporal analysis of products technique, we show that supported Na2WO4/SiO2 catalysts possess two different types of oxygen species, dissolved O-2 and atomic O, at an OCM-relevant temperature. The addition of Mn-oxide to this catalyst increases the total amount and release rate of dissolved O-2 species and improves C-2 selectivity of both dissolved O-2 and atomic lattice O species.
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