R. A. Shutilov

Interaction of geomechanical and physicochemical processes in Kuzbass coal

The paper presents laboratory and in situ research data on interaction of geomechanical and physicochemical processes in Kuzbass coal of various ranks, considering temperature effect. Under analysis is the relation of stress-strain state, temperature and infrared radiation of coal. The authors study the role of temperature and microstructure of coal in energy and mass exchange processes (variation of mass, volatile yield, specific surface, internal energy of methane adsorption capacity decrease and moisture content). Interrelation of outburst hazard and fire hazard in coal is discussed from the viewpoint of uniform stagewise thermomechanics and thermochemistry of coal behavior in the course of coal formation and extraction. The article introduces a generalized factor for quantitative description of petrographic properties of coal. Using this factor, the authors classify and describe petrographic groups of Kuzbass coal.

The state of Cu2+ ions in concentrated aqueous ammonia solutions of copper nitrate

Stabilization of Cu2+ ions in concentrated aqueous ammonia solutions of copper nitrate in a wide range of ammonium ion concentrations has been studied by EPR and electronic absorption spectroscopy. Three types of Cu2+ associates with different types of orbital ordering have been identified. The ammonium ion concentration in a solution has a decisive effect on the type of orbital ordering of Cu2+ ions in associates. In all cases, Cu2+ ordering in associates is caused by the existence of bridging OH groups in the axial and equatorial positions of [Cu(NH3)n(H2O)6 − n]2+ complexes (n < 6). At a high concentration of ammonium ions, weakly bound associates of tetramminecopper with the

Distribution of copper- and nickel-containing modifier components in the pore space of HZSM-5 zeolite

d_{x^2 - y^2 }

State of the copper-containing component and the catalytic properties of Cu/ZSM-5 in selective NO reduction with propane

ground state are formed. In solutions with low ammonium concentrations, bulky associates with the

Pore Structure of USY Zeolites in Dependence on Steaming Condition

d_{y^2 }

Orbital ordering of Cu2+ ions in concentrated aqueous ammonia solutions of copper chloride, sulfate, and acetate as probed by ESR

and