Butenko A. Physicochemical fundamentals and technologies of production and regeneration of nanosilver catalysts of metanol production

Object of the research: physical and chemical bases and technologies of production and regeneration of the deposited nanosilver catalysts for formaldehyde production. Aim of the research: development of physical and chemical bases and technologies of production and regeneration of lowconcentrated nanosilver catalysts of oxidizing methanol conversion to formaldehyde, that are not attended with the nitrose gases release in an environment, with the use of carrier from the raw material resources of Ukraine. Methods of the research: X-ray, phase, spectroscopic, HRTEM analysis, BET and mercury pore measuring, chromatographic, conductometry, potentiomety, titrimetric. Theoretical and applied results: kinetic and mathematical models were worked out: process of oxidizing methanol conversion to formaldehyde, lixiviating of infused admixtures and carbonization of silver catalyst; and new technological processes and resource saving technologies of production and used catalysts regeneration, that are not attended with the nitrose gases release and allow to shorten silver content and to increase it's lifetime duration in 2,5 times; the composition and the technology of carrier for silver made frome the raw material sources of Ukraine were worked out. Novelty: physical and chemical bases of process of oxidizing methanol conversion to formaldehyde were created; impossibility of silver modification by some metals or their oxides was validated; the parallel mechanism of the process of oxidizing conversion, combined with free-radical, was offered; the mechanism of silver catalysts deactivation, conditioned by its carbonization (40 %), by deformation of a crystalline grate, by increase of minimal silver grain size (47 %), and by infused admixtures (13 %) were offered. Appliance degree: the worked out technology of the deposited nanosilver catalysts is implemented on "Severodonetsky Azot", technology of used catalysts regeneration passed industrial tests at the same enterprise. In NTU "KhPI" Results of the research are used in an educational process of a department "General and inorganic chemistry" 02.00.01 in teaching chemistry of metallic elements, and of a department "Technology of inorganic substances, catalysis and ecology" 05.17.01. Field of the use: chemical industry.