L. A. Tyurina

Allylic isomerization of allylbenzene on nanosized gold particles

Nanosized gold particles immobilized on γ-Al2O3 exhibited catalytic activity in the allylic isomerization reaction of allylbenzene. As the size of gold nanoparticles was decreased from 40 to 2 nm, their specific activity per surface gold atom nonmonotonically increased from 0.5 to 110 (mol products) (mol Ausurface)−1 h−1. The particles greater than 40 nm were practically inactive.

Catalysis of Olefin Hydrogenation and Allylic Isomerization by Immobilized Gold Nanoclusters

Gold nanoparticles immobilized on carbon and oxide supports showed catalytic activity in the hydrogenation and allylic isomerization of alkenes and arylalk-1-enes. The catalysts were active only in the case when the average size of metal particles did not exceed 30 nm. Hydrogenation was accompanied by the allylic isomerization of the substrate. Under chosen conditions, the ratio of hydrogenation to isomerization rate was close to 1: 2. The activity of gold nanoparticles immobilized on oxide catalysts increases with an increase in their acidity.

The mechanism of allyl isomerization of unsaturated compounds catalyzed by organomagnesium clusters

The paper presents a density functional theory investigation of the mechanism of allyl isomerization of olefins on magnesium clusters for the example of the Mg4-allylbenzene system. The rearrangement of the cluster compound corresponding to the insertion of the tetranuclear cluster at a C-H allylbenzene bond into a structure derivative from 2-methylstyrene is an activationless reaction. The limiting step is the liberation of the cluster nucleus capable of interacting with another allylbenzene molecule. Cluster decomposition competes with this process; this conclusion is in agreement with experimental short lifetimes of cluster magnesium hydride catalysts.

Field technology for desulfurization of associated petroleum gas

Applicability of gas desulfurization technologies for sulfur-containing gases under conditions of the limited choice is analyzed. Data on efficiency of a new process for catalytic desulfurization of sulfur-containing gases through H2S and RSH conversion in sulfur and disulfides, respectively, is demonstrated. The technology is approved in pilot projects of gas desulfurization at a flare line, on a gas-processing plant. The equipment is developed and certificated. Installations for catalytic desulfurization are intended to be equipped with a complete set of blocks for gas preparation and power-generating equipment directly at deposits. This solution substantially decreases both capital and operational expenditures compared to the traditional multi-stage absorption/desorption technologies such as expensive Claus process.

Catalytic self-hydrogenation of anthracene in the presence of a magnesium-anthracene adduct

The catalytic properties of cluster magnesium derivatives were studied using the self-hydrogenation reaction of unsaturated compounds as an example. In the presence of a cluster magnesium–anthracene adduct at 150–298 K, the self-hydrogenation of anthracene occurred with yields of up to 40 molecules per atom of magnesium.

Effect of the composition of the immobilized copper-containing ionic liquid on the dodecyl mercaptan oxidation kinetics

Basic kinetic parameters of the catalytic oxidation of dodecyl mercaptan in kerosene in the presence of silica-immobilized pyridinium or imidazolium chlorocuprate complexes have been determined. The composition of the copper-containing anions and the oxidation kinetics depend on the nature of the ionic liquid and on the method of its synthesis. The compositions developed in this study are usable in the removal of hydrogen sulfide and light mercaptans from the oil stripping gas.