III International Conference

PP-II-16TECHNOLOGY CONCEPTS ON DEVELOPING OF CATALYSTS AND SORBENTSOF BLOCK AND BLOCK-GRANULAR TYPESBeskov V.S., Vanchourin V.I.Mendeleev University of Chemical Technology of Russia, Moscow, RussiaE-mail: beskov@muctr.edu.ruMethods of producing large catalyst elements of block and block-granular type directlyfrom active blend were developed. Preparation of blend for forming block catalyst is based onstructure-kinetic modification of active catalyst mass. From modified charge blend it ispossible to prepare honeycomb catalysts of thin structure directly from active catalyst mass.Producing of large-sized elements of block-granular type catalyst is based on gluing catalystgranules in the form of ready formations, modeling structure and geometry of fixed bed. Thedeveloped method allows to save accessibility of outer surface, specific surface area andstability of initial catalyst.Development of industrial catalyst chemistry requires working out effective solutions ontechnology of catalysts and sorbents of new geometrical shapes, in particular, of block andblock-granular types. Thus moulding of large catalyst element immediately from active blendis considered to be more promising direction in comparison with treating technology.The choice of a method of active fusion mixture modification for creating necessaryplasticizing, greasing, dispersive and stabilizing properties has fundamental importance bothfor moulding of elements of complicated shape and their heat treatment. Well-known methodsof preparing block catalysts from active blend are based on joint grinding and mixing ofprimary components. As practice shows it is rather difficult to transfer original particles ofrough sizes into more active colloidal-disperse state and achieve necessary homogenization ofactive fusion mixture. Structure inhomogeneities of molding compound transfer to semifinishedmaterial of block catalyst and result in significant defects after further heat treating.We offer method of structure-kinetic modification for homogenization of active fusionmixture, increasing mobility of its structure units, securing its aggregative stability,minimizing mechanical defect formation at extrusion and units heat treatment stages.Investigations allowed to base mode of preparation from active fusion mixture of moldingcompounds possessing set of rheological properties that are necessary for the following stablemoulding of elements of complicated shape. The method has been tested for producing blockcatalysts and sorbents for ammonia conversion, sulphur dioxide oxidation and catching ofaerosols of platinoids.191