B. V. Romanovskii

Nanocomposites based on LaCoO3 and mesoporous molecular sieves: Preparation and physicochemical and catalytic properties

Individual perovskite-like LaCoO3 obtained by the citrate method and LaCoO3 supported onto the mesoporous molecular sieve MSM-41 have been characterized by X-ray powder diffraction, EPMA, low-temperature nitrogen adsorption, H2 TPR, and EXAFS. The catalytic activity of the supported cobaltate in methanol oxidation is two orders of magnitude higher than the activity of the bulk cobaltate owing to nanosized LaCoO3 particles in the pores of the molecular sieve.

Structured mesoporous Mn, Fe, and Co oxides: Synthesis, physicochemical, and catalytic properties

Structured mesoporous Mn, Fe, and Co oxides are synthesized using “soft” and “hard” templates; the resulting materials are characterized by XRD, SEM, TEM, BET, and TG. It is shown that in the first case, the oxides have high surface areas of up to 450 m2/g that are preserved after calcination of the material up to 300°C. Even though, the surface area of the oxides prepared by the “hard-template” method does not exceed 100 m2/g; it is, however, thermally stable up to 500°C. Catalytic activity of mesoporous oxides in methanol conversion was found to depend on both the nature of the transition metal and the type of template used in synthesis.

Mesoporous cobalt and manganese spinels: Synthesis and physicochemical properties

Binary spinels of Со and Мn are obtained by means of hard-template synthesis. Their structural and chemical characteristics are determined via N2-BET, XRD, and TEM. Their catalytic activity is studied using methanol oxidation as the model reaction.

Catalytic oxidation of methanol on high-dispersity iron oxide in micro- and mesoporous molecular sieves

The catalytic properties of high-dispersity iron oxide deposited on micro-and mesoporous molecular sieves were studied. The deposition was performed by the in situ thermooxidative degradation of various precursors. The atomic catalytic activity of the catalysts in the oxidation of methanol was found to depend on both iron concentration and the accessibility of iron oxide particles.