Catalyst Coatings Carriers Based on Aluminium-Silicon Glass Crystalline Compositions

A method of deposition on the surface of metals or ceramics catalytically active compounds by attaching them to the intermediate glass crystalline coatings. The effect of the presence of 3d-transition elements in the intermediate coating to modify the activity of a palladium containing catalyst was studied. The basic indicators of the efficiency of non-isothermal heterogeneous catalytic conversion process of benzene depending on the types of transition metals which are part of the intermediate coating were studied. Comprehensive analysis of the morphology of a glass-intermediate secondary catalyst carriers and surface coating them with layers of catalytically active compounds was carried out, which allowed to estimate the effect of the characteristic features of the structure of the coating surface on the rate constant of the process of conversion and mass transfer coefficient

Catalyst Coatings Carriers Based on Aluminium-Silicon Glass Crystalline Compositions

A method of deposition on the surface of metals or ceramics catalytically active compounds by attaching them to the intermediate glass crystalline coatings. The effect of the presence of 3d-transition elements in the intermediate coating to modify the activity of a palladium containing catalyst was studied. The basic indicators of the efficiency of non-isothermal heterogeneous catalytic conversion process of benzene depending on the types of transition metals which are part of the intermediate coating were studied. Comprehensive analysis of the morphology of a glass-intermediate secondary catalyst carriers and surface coating them with layers of catalytically active compounds was carried out, which allowed to estimate the effect of the characteristic features of the structure of the coating surface on the rate constant of the process of conversion and mass transfer coefficient

Calculation of the Operation Parameters of the Catalytic Converters of the Harmful Gas Impurities

There are theoretically founded principles of catalytic converters designing of harmful gas emissions of various heat devices. Experimental investigations have shown that the smallest aerodynamic losses in the constructions of gas neutralizers are achieved at the using of profiled ceramic blades as working units - carriers of catalysts. To ensure intensive mixing of the flow inside the converter the input edges of the blades grids of the future stages should be located between the output edges of the blades of the grids of the preceding stages

Identification algorithms for thermal conductivity coefficient of wood using the inverse problem

A realization for the challenges of thermal conductivity coefficient identification of wood by using the inverse heat conduction problem is proposed. An overview of mathematical tools involved in the construction of a mathematical model of the experiment is given. The object of research is the thermal conductivity coefficient of wood raw material. The results of this work are functions that showing dependences between thermal conductivity coefficient and certain temperatures specified using polar coordinate system

The Longitudinal Flow of Oil and Petroleum Products in the Channels and Pipes. Part II

A model associated fluid flow and heat transfer of longitudinal flows of oil in pipes and channels is considered. The model is an extended version of the Bingham flow on the case of flow with one or two solid cores. The fluid part is a two-phase medium, wherein the disperse phase may consist of solid particles, droplets and gas bubbles. The sliding on the borders of pipes and channels, thermal conductivity and viscosity of such systems and their impact on the characteristics of the solid core are discussed. The flow with a yield point dependence on the temperature is also considered

PdO impact on the activity of hydrocarbon oxidation with oxide catalysts

The palladium component influence on the catalytic activity of a catalyst was investigated based on transition-metal oxides deposited on α-Al2O3 carrier in the process of hydrocarbon catalytic thermal destruction. It has been determined that the value of surface concentrations of PdO deposited on Co3O4 doesn’t effect on the achievable conversion degree when using the obtained catalytic converter. It is suggested that PdO facilitates the interfacial diffusion of atomic oxygen on the catalyst oxide component due to support it in an oxidized state. Adsorbed on palladium oxygen migrates on cobalt oxide in the composition of this catalyst. At the expense of this process oxygen passivation of Pd-Co3O4/γ-Al2O3 catalyst is overcome and its high reaction activity is ensured. Our research is evidence that Co3O4 performs the role of active centers on a corundum carrier in the reaction of catalytic thermal hydrocarbon oxidation. Additionally injected PdO into the catalyst composition promotes to the cobalt phase enrichment by oxygen

Determining Energy Cost for Milling Solid Matter in a Ball Mill

The article provides findings of analytical research into the process of milling friable matter in a ball mill. We have received an expression to determine energy cost of milling with the account of the method of milling and the characteristics of the material to be ground. In the paper, the analytical results of bulk materials grinding process in a ball mill are presented. The differential equation is obtained whose solution determines the value of the grinding mode coefficient, corresponding to the maximum value of grinding process efficiency. The use of the introduced ball mill modes allows reducing the time spent on grinding by 28.9 % for cement clinker, 18.4 % for black coal, 28.9 % for marble and 19.6 % for rock salt compared to the traditionally recommended ones

The longitudinal flow of oil and petroleum products in the channels and pipes

A model associated fluid flow and heat transfer of longitudinal flows of oil in pipes and channelsis considered. The model is based on the existence of a solid core or two such cores and fluid flow part. The flow is considered for the fluid part of Newtonian fluid, for power-law fluidsand for a Newtonian fluid in a turbulent regime. The amendments related to the nonlongitudinal to the flow equations of fluid dynamics and heat transfer, and their impact on core characteristics arediscussed

Installation for identification of heat conductivity coefficient of wood

The experimental installation for identification of coefficient of heat conductivity of the wood that models the running of processes similar to operating conditions of devices for pyrolysis of wood is offered. The description of installation elements and their functional purpose is given. The dependence of coefficient of heat conductivity of a pine on temperature expressed in polar coordinates is received