N. V. Vlasenko

FEATURES OF FUNCTIONALIZATION OF MCM-41 SILICA MESOPOROUS MOLECULAR SIEVES DURING THEIR TEMPLATE SYNTHESIS

We have shown that functionalization of MCM-41 mesoporous molecular sieves during their template synthesis using the effect of solubilization of organic hydrophobic co-condensing compounds makes it possible to obtain highly ordered mesoporous molecular sieves, with concentrations of vinyl or allyl groups covalently bonded to the surface of the silica matrix of about 3.5 mmol/g, which after sulfonation have acidic properties and exhibit catalytic activity in the process of ethyl tert-butyl ether synthesis.

Effect of the Component Ratio in ZrO2-SiO2 Catalysts on the Selectivity of Dimethyl Carbonate Formation from Methanol and Carbon Dioxide

The catalytic activity of ZrO2-SiO2 systems in the gas-phase carboxylation of methanol was studied. The formation of dimethyl carbonate proceeds on the catalysts with predominantly strong base sites. The concentration and strength of these sites is a function of the phase composition of the catalysts.

Effect of Spectrum of Acidity of Zeolites of Various Structural Types on Their Catalytic Characteristics in the Synthesis of Ethyl tert-Butyl Ether

The catalytic properties of zeolites of various structural types in the liquid phase synthesis of ethyl tert-butyl ether from isobutylene and ethanol have been studied. The activity and selectivity of the catalysts depend on the concentration and strength of the acid centers. A possible mechanism for the synthesis of ethyl tert-butyl ether is proposed, suggesting that isobutylene and ethanol are activated on the weak and strong acid centers respectively.

Effect of the Morphology of Sulfo Cation Exchangers on their Catalytic Properties in the Preparation of Ethyl tert-Butyl Ether

It was shown that the morphology of sulfo cationic exchange catalysts described by fractal geometry determines their characteristics in the heterogeneous catalytic synthesis of ethyl tert-butyl ether. It was established that catalysts with partial coverage of the support by the sulfo cation exchanger have higher selectivity and greater productivity in the active phase than catalysts with more than monolayer coverage.

Effect of crystallinity in HZSM-5-amorphous alumosilica systems on their catalytic properties in the synthesis of dimethoxymethane

Granulated catalysts with 3–5% H-ZSM-5 phase were obtained from a highly dispersed alumosilica and were used for the synthesis of dimethoxymethane (DMM) from methanol and formaldehyde. The activity of these catalysts is greater than the activity of pure zeolite. A linear correlation was found between the yield of DMM and the content of Brönsted acid sites in the catalysts.

Preparation of hybrid organo-inorganic catalysts based on MSM-41 mesoporous molecular sieves and their properties in synthesis of ethyl tert-butyl ether

A series of sulfoorganosilica (vinyl-containing) catalysts based on MSM-41 mesoporous molecular sieves were prepared by template synthesis. The structure and properties of these catalysts and their catalytic characteristics in synthesis of ethyl tert-butyl ether were examined.