An approach to the development of bimetallic nanoparticles with the separated but interacting phases of silver and palladium was proposed to effectively separate the active sites of silver, which possess high activity in activation of molecular oxygen, and the sites of palladium containing phases, which are responsi ble for CO adsorption. The structure of PdAg particles was determined using X ray diffraction analysis, elec tronic diffuse reflectance spectroscopy, and temperature programmed reduction. It was found that the intro duction of silver led to easier reduction of palladium from oxidized states in an atmosphere of CO. The activ ity of the bimetallic PdAg catalysts in the oxidation of CO increased, as compared with that of the Pd/SiO 2 catalyst. The oxidized bimetallic catalyst, in which palladium occurred in an oxide state, was even more effec tive in the oxidation of CO; this can be related to the better cooperation of the active sites of silver and palla dium oxide, which are responsible for the activation and conversion of CO and oxygen at the Ag-PdO inter facial boundary.

Abstract.The method for identification of the triplet of kinetic parameters of a heterogeneous reaction using the data of the derivatographic analysis is proposed. This method is characterized by high accuracy and relative simplicity and it can be effectively realized using MS Excel software.Metal nanopowder is one of the most prospective high-energy materials that is widely used in many spheres [1,2]. This explains long and sustained interest in studying the features of metal nanopowder, in particular the kinetics of oxidation [3]. The proceeding heterogeneous reaction can be in full measure characterized by the so-called "kinetic triplet" -the frequency factor A, the activation energy and the mathematical description of the reaction mechanism f(α) [4,5,6].To identify these three parameters, the data of the derivatographic experiment conducted in the non-isothermal mode are used, when the change in the degree of transformation of the material α over time t is described by the differential equationUnder the temperature-linear heating where the rate of temperature increase T with a given parameter β = ⁄ and a specific mechanism (α) = (1 − α) , the kinetic equation (1) can be represented aswhere n -order (index) of reaction. Equation (2) has no analytical solution and numerical methods or approximate analytical ones are used to determine the kinetic parameters.The aim of this paper is to represent a quantitative result analysis of the derivatographic study of oxidation on the basis of a new approach to calculating the kinetic parameters of a  Corresponding author: bvborisov@tpu.ru

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Structure and properties of ZrO 2 and Al 2 O 3 powders produced using plasma chemical technique were studied in the framework of this research. Obtained Al 2 O 3 powder was used for reinforcement of Al alloy. Improvement of mechanical properties of Al alloy associated with introduction of alumina particles into the melt was demonstrated.