FORMATION AND PROPERTIES OF BULK DEFECTS IN LI/CAO AND NA/CAO CATALYSTS ON THE BASIS OF SOLID-SOLUTIONS IN THE OXIDATIVE CONVERSION OF METHANE | Научно-инновационный портал СФУ

FORMATION AND PROPERTIES OF BULK DEFECTS IN LI/CAO AND NA/CAO CATALYSTS ON THE BASIS OF SOLID-SOLUTIONS IN THE OXIDATIVE CONVERSION OF METHANE

Тип публикации: статья из журнала

Год издания: 1995

Аннотация: The introduction of Li+ or Na+ into the lattice of CaO in the region of concentrations, corresponding to the existence of solid solutions, is found to result in the stabilization of trace Fe3+ ions in cationic sites of calcium oxide. When both Na+ and Li+ are used as the alkaline component, the activity of the catalyst in methane conversion in the CH4 + O-2 and CH4 + N2O reaction mixtures increases with a rise in the concentration of Fe3+ ions. The lower activity of the catalyst in CO formation from the CH4 + N2O mixture as compared to the CH4 + O-2 mixture as compared to the CH4 + O-2 mixture is explained by decreasing the concentration of O-cus(2-) (a coordinatively unsaturated lattice oxygen species). Under the conditions of catalysis, the formation of defects of the O-3(2-), CO22-, and M(+)CO(3)(2-) (M = Li or Na) types occurs in the bulk of a M/CaO catalyst; their concentrations depend on the composition of the gas phase. An increase in the fraction of the M(+)CO(3)(2-) centers in doped CaO is found to result in a rise in the selectivity of the formation of C-2 products in the CH4 + O-2 reaction mixture.

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Издание

Журнал: KINETICS AND CATALYSIS

Выпуск журнала: Vol. 36, Is. 5

Номера страниц: 658-662

ISSN журнала: 00231584

Место издания: NEW YORK

Издатель: MAIK NAUKA/INTERPERIODICA

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