III International Conference

PP-II-16During preparation of molding compound and specially its streaming throughshaping−tool effect of “bead mill” is implemented when particles of cordierite play the role ofgrinding elements. Modification of active fusion mixture increases significantly mobility ofits structural elements, accelerates relaxation processes, improves frictional properties ofmolding compounds and results in more uniform product yield from drawplate.Working out methods of conglutinating of granules as ready formations, modelingstructure and geometry of stationary fixed bed is another direction in developing technologiesof large-sized catalysts.It is necessary to solve two main problems in technology of block-grainy catalysts.Firstly, in order to save interior surface before using agglutinants it is necessary to conducthydrophobization of hydrophilic surfaces of grains with substance that can also take part informing stable adhesive bonds between grains. Secondly, nature of agglutinants and sequenceof their input in active fusion mixture have to provide with extraction of cementing phase thatpossesses sufficient strength and penetration for reacting molecules.By the example of vanadium catalyst for sulphur dioxide oxidation it is reasonable to usechromiferous surfactant as hydrophobisator and potassium aluminate and aluminiumphosphate solutions as agglutinants. These substances contain compounds that are promotersof vanadium sulfuric acid catalysts and their using in limited concentrations can be reflectedpositively on activity. Comparative data on basic properties of block-grainy and grainularcatalyst are shown:Characteristics of grainy and modular-grainy catalysts.CatalystRate constant, sec −1 MPa −1 undertemperature, K693 758Mechanicalstrength, MPaSpecific surfacearea, m 2 /gGrainy 4,9 15,5 0,31 8,4Block-grainy 6,2 16,0 0,45 7,7It can be seen that modular-grainy catalyst can be highly competitive with industrialgrainy catalyst on activity, specific surface area and strength.Work is executed with support of grant of The Ministry of Education and sciences of RF192