III International Conference

PP-I-29HIGHLY POROUS BLOCK CELLULAR CATALYSTKozlov A.I., Grunskiy V.N., Bespalov A.V., Beskov V.S.Mendeleev University of Chemical Technology of Russia, Moscow, RussiaE-mail: beskov@muctr.edu.ruNew technology of producing block highly porous permeable cellular structures forcatalysts and sorbents has been developed. Elements of such structure have porosity up to90..95%, specific surface area of active layer – 180..250 m 2 /g, apparent density –0,25-0,70 g/sm 3 , compression resistance up to 1,0 MPa. Practical tests of new catalysts in gasphasereduction of nitrogen oxide with ammonia, liquid-phase hydrogenation of nitrocompounds to aromatic amines have confirmed their efficiency.Highly porous cellular catalysts are represented by large elements with hard archylabyrinthstructure where free space exceeds 90 % of their volume.A method of creating highly porous permeable cellular structure (catalysts, sorbents,distributing bed) has been developed in Mendeleev University. It is proposed to utillize highlyporous cellular material as a catalyst carrier. In this method ceramic material on the basis ofaluminium oxide duplicates open-cellular urethane foam matrix. After that, filling isactivated, for example, with transition metals of VIII group of Mendeleev’s table (palladium,nickel, etc.).New method allows to produce block highly porous permeable cellular catalysts(sorbents, distributing bed) of any geometrical configuration (cylinders, prisms, etc.) andsizes. Elements have archy-labyrinth structure with porosity up to 90..95 % consist of cellswith diameter 0,5-3,00 mm and have developed geometric surface. After carrying base layerand active component microporosity amounts to 15-20 %, micropores size – 0,1-1,2 mkm,specific surface area of active layer – 180..250 m 2 /g. Apparent density of the element is 0.25-0.70 g/sm3, compression strength is up to 1.0 MPa. Hydraylic resistance of block cellularcatalysts is several times smaller than of granular fixed bed.To the present time block highly porous permeable cellular catalysts are tested at pilotand industrial equipment. Reduction of nitrogen oxide with ammonia at plant unit show thatat average conversion of NO is 92,2 % (max conversion reached 97 %), gas flow rate onblock highly porous permeable cellular catalysts is 20 times higher than for granulatedcatalyst ABK-10 (Alumino-Vanadium catalyst) used now, 10 times highly than for oxidecatalyst (V-Ti-O) and it allows to reduce significantly dimensions of catalytic reactors andsimplify their construction.60