Ivanenko V. Coke on acid zeolite catalysts: formation, localization, dynamics

Coke deposits which was formed at acid zeolite catalysts during course of carbonium ion reaction. Determining the distribution of coke deposits in the separate structure elements of zeolites deactivated in various reactions and aged during various periods of time for the purpose to synthesize zeolite catalysts of enhanced efficiency. Flow-circulating, continuous-flow and micro pulse catalytic methods, method of discrete-successive coke micro-oxidation, IR-spectroscopy, method of temperature programmed ammonia desorption, gas chromatographic methods. Method of discrete-successive micro-oxidation of coke at zeolite catalysts deactivated has been improved. On this base firstly in the heterogeneous catalysis practice one succeeded in determining the distribution of coke deposits in the separate structure elements of faujasite, mordenite and pentasil type zeolites. Alternate movement of coke in deactivated and aged samples with the vector, by turns directed onto the outer surface of zeolite crystals as well as into the deep of zeolite structure, has been revealed. The theoretical treatment of the phenomenon observed has been proposed with its generalization for the thermodynamic characterization of a substance as such in massive and cluster conditions. The information obtained has been used for the improvement of zeolite catalysts by means of deactivating the outer surface of zeolite crystals. Sphere of use is oil chemistry.