III International Conference

PP-I-2APPLICATION OF ULTRASONIC RADIATION IN HETEROGENEOUS CATALYSISRomensky A.V., Kazakov V.V., Volokhov I.V.Close Joint Stock Company "Severodonetsk Azot Association", Severodonetsk, UkraineE-mail: ntc@azot.lg.uaUnder consideration is mechanism and kinetics of heterogeneous catalysts preparationand regeneration in ultrasonic field.Economic efficiency of application of ultrasonic radiation in catalysis has beendemonstrated.Despite the fact that ultrasonic radiation (US) is currently used in various industries, itsapplication in heterogeneous catalysis has not been addressed in the literature so far.It can be attributed to the fact that mechanism and kinetics of the catalytic action ofsubstance in various chemical processes is at the research stage. Existing catalysis theories arebased on various assumptions with regard to catalytic action nature. At that, the conceptualissue is still view of the catalyst and the reactant as a single system in which the catalystundergoes change under chemical action.Use of ultrasonic radiation in preparation and regeneration of heterogeneous catalysts isnoted for significant complexities considering that when describing mechanism and kineticsof an active catalytic structure formation in ultrasonic field it is necessary to take intoconsideration a complex of chemical, thermal, diffusion, acoustic-hydrodynamic processesoccurring in "liquid − solid" system.Currently the following trends can be identified in research on application of ultrasonicradiation in heterogeneous catalysis:- preparation of substrate based catalysts by ultrasonic impregnation method;- synthesis of mixed catalytic contacts in ultrasonic field;- spent catalyst regeneration under the influence of ultrasonic radiation;- research of catalytic processes in presence of catalysts and ultrasonic field;- purely ultrasonic catalytic processes without catalyst.Character of the selected research direction is influenced by the mechanism and kineticsof the catalytic action in presence of ultrasonic radiation. For reactions, which occur at hightemperatures, phase mechanism plays the dominant role while in transfer to low temperaturescombined mechanisms start to dominate.9