Effect of the Conditions of Preliminary Mechanochemical Treatment of the Reaction Mixture on the Properties of Catalysts Based on Sr2TiO4
YU. A. IVANOVA1, E. F. SUTORMINA1, A. V. NARTOVA1,2, L. A. ISUPOVA1
1Boreskov Institute of Catalysis, SB RAS, Novosibirsk, Russia
2Novosibirsk State University, Novosibirsk, Russia
Keywords: слоистые перовскитоподобные оксиды, механохимический метод синтеза, окислительная конденсация метана, layered perovskite-like oxides, mehcanochemical synthesis method, oxidative condensation of methane
Pages: 381-386
Abstract
The effect of the conditions of mechanochemical activation (initial components and activation time) on the phase and surface composition, texture characteristics of the catalysts based on strontium titanates with layered perovskite structure and their activity in the oxidative condensation of methane (OCM) at a temperature of 800-900 oC was studied. The resulting catalysts were characterized by means of XPA, mercury porosimetry, BET, XPES. The conditions for obtaining single-phase, well crystallized Sr2TiO4 were chosen: the use of a mixture of TiO2 + SrCO3 as the initial components, activation time 8 min, annealing at 1100 °С for 4 h. It was shown that the catalysts obtained using the mechanochemical method exhibit higher activity in the reaction of OCM (high methane conversion degree, high yield of С2-hydrocarbons) in comparison with the catalysts prepared through co-precipitation.
DOI: 10.15372/CSD20180405
|
