Melt-assisted phase transformations of A/W/Mn/SiO2 (A = Li, Na, K, Rb, Cs) composite catalysts

This paper analyzes results obtained in studies of A/W/Mn/SiO 2 (A = Li, Na, K, Rb, Cs) composite catalysts for the oxidative coupling of methane (OCM). Particular attention is paid to phase transformations. It is pointed out that the SiO 2 matrix is an active catalytic component of the composites,...

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Bibliographic Details
Published in:Inorganic materials 2017-06, Vol.53 (6), p.553-559
Main Author: Nipan, G. D.
Format: Article
Language:English
Subjects:
Alkali metals
Catalysts
Cesium
Chemical synthesis
Chemistry
Chemistry and Materials Science
Composition effects
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Lithium
Manganese
Materials Science
Phase composition
Phase transitions
Rubidium
Silicon dioxide
Sodium
Tungstates
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Summary:This paper analyzes results obtained in studies of A/W/Mn/SiO 2 (A = Li, Na, K, Rb, Cs) composite catalysts for the oxidative coupling of methane (OCM). Particular attention is paid to phase transformations. It is pointed out that the SiO 2 matrix is an active catalytic component of the composites, rather than an inert carrier of additives, and that the heterogeneous OCM process involves melts based on alkali metal tungstates, along with polycrystalline manganese oxides. The effects of the cation ratio and synthesis method on the phase composition of the A/W/Mn/SiO 2 (A = Li, Na, K, Rb, Cs) materials is examined.
ISSN:0020-1685
1608-3172
DOI:10.1134/S0020168517060140