L. N. Kurina

Tin-containing systems as catalysts for deep oxidation of hydrocarbons

MOx-SnOy (M = Zn, Cu, Co, Mn, Ce) systems were studied in the reaction of deep oxidation of propane and butane.

Effect of iodine-containing promoter on the catalytic activity of silver in the course of ethylene glycol oxidation

Surface morphology and catalytic properties of electrolytic silver crystals in partial oxidation of ethylene glycol into glyoxal were studied.

Interaction of Methane and Oxygen with the Surface of Manganese Oxide-Containing Catalysts

We used pulsed reduction and temperature programmed oxidation to study the interaction of methane and oxygen with the surface of manganese oxide-containing catalysts. We hypothesized that during oxidative dimerization of methane, the phase supplying strongly bound oxygen for selective methane coupling is an acceptor for weakly bound oxygen of the phase catalyzing exhaustive oxidation.

Tin-Containing Catalysts, Modified with Alkaline Earth Metals in the Oxidative Dimerization of Methane

The effect of addition alkaline earth metals on the physico-chemical properties of M-Sn-O/α-Al2O3 and M-Pb-Sn-O/α-Al2O3 catalysts is studied. The formation of metal metastannates in the M-Sn-O/α-Al2O3 system facilitated the growth of selectivity of the catalysts. Addition of alkaline earth metals into the Pb-Sn-O/α-Al2O3 composition resulted in stabilization of lead in the 4-valent state with formation of metal ortho-plumbates and a decrease in the selectivity for C2 hydrocarbons. The linkage between the basicity of the surface and the catalytic properties of the samples was established.

Phase Composition of the Lead-Tin Oxide System

The influence of the component ratio, support type, and preparation procedure on the phase composition of the lead-tin oxide catalysts was studied.

Morphological Characteristics of the Products from the Carbonization of the Copper Catalyst in the Partial Oxidation of Ethylene Glycol

The formation of carbonization products in the oxidation of ethylene glycol to glyoxal on a massive sample of copper catalyst was studied by electron microscopy, elemental CH analysis, X-ray phase analysis, and the catalytic flow method. Filamentary, dendritic, and polycrystalline morphological forms of the carbonization products were identified. It was shown that there is a relation between the morphological forms of the carbonization products and the catalytic activity of the copper.

Effects of Composition and Method of Preparation of Lead-Containing Oxide Systems on Their Catalytic Properties in the Oxidative Dimerization of Methane

The effects of the Pb-Sn-O composition, the method of precipitating the active components, and modification with alkaline earth metals on the physico-chemical and catalytic properties of lead-tin catalysts in oxidative dimerization of methane have been studied. The effect of the phases of lead orthostannate, Pb2SnO4, on the surface properties of the Pb-Sn-O system has been established. The most selective composition has a ratio PbO : SnO2 = 80 : 20 mole % on α-Al2O3 with divalent metal hydroxides. Introduction of alkaline earth metals into the Pb-Sn-O/α-Al2O3 system leads to stabilization of lead in its 4-valent state with formation of metal orthoplumbates, M2PbO4, and to a decrease in selectivity with respect to C2-hydrocarbons. The increased catalytic activity of the modified M-Pb-Sn-O/α-Al2O3 samples (M = Ba, Sr, Ca, and Mg) is determined by the presence of tightly bound oxygen. Conclusions about the nature of the interaction of the reagents with the surface of the catalyst were reached.