III International Conference

PP-III-36FRAME STRUCTURED CORDIERITE-LIKE HONEYCOMB CATALYSTSIN AMMONIA OXIDATION PROCESSIsupova L.A., Sutormina E.F., Kulikovskaya N.A., Marchuk A.A., Turov A.A.,Krasil’nikov V. 1 , Smirnov A. 1Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia1 Novosibirsk State Technical University, Novosibirsk, RussiaE-mail: selena@catalysis.nsk.suFrame structured cordierite-like honeycomb catalysts doped with Fe, Co, Mn, Bi and Vcations were prepared by extrusion. All prepared catalysts had high activity in ammoniaoxidation reaction: the conversion degree at 850-900 o C was about 95-100 %. NO yieldstrongly depended on catalysts chemical composition and cell density. Frame structuredcatalysts has high durability and thermoshock resistance. Stability of the prepared catalystwas checked by the 3-months life test in the UKL-7 high pressure nitric acid plant.Bulk honeycomb monolith iron oxide catalyst for ammonia oxidation process (BIC-42-1)developed by the Boreskov Institute of Catalysis is now commercially used in nitric acidplants working under high pressure [1]. However, its application for medium pressure plantsis questionable due to its geometry. Monoliths with high cell density and high thermoshockresistance are required [2].The frame structured cordierite (2MgO * 2Al 2 O 3 * 5SiO 2 ) honeycombs are characterizedby the low TEC (2*10 -6 1/K) and often used as a refractory carrier for high temperaturecatalyst applications [3]. A frame structure allows to obtain modified materials with 3d activecations instead of Mg, that may be active in ammonia oxidation.In this study, we investigated performances and behaviors of frame structured cordieritelikehoneycomb catalysts doping with Fe, Co, Mn, Bi and V cations in the high-temperatureprocesses of ammonia oxidation into NO in nitric acid production.The honeycomb cordierite-like catalysts were obtained by extrusion of plastic pasteprepared by mixing of raw materials and 3d oxides (Fe 2 O 3 , Co 3 O 4 , Bi 2 O 3 , V 2 O 5 ) taken in astoichiometric ratio with water solution of methylcellulose. Prepared monoliths were aircuredat room temperature for 5-14 days, dried at 350 o C for 4 h, and than calcined at1000-1250 o C for 4 h. The resulted monoliths had triangular and square channels with 45, 56and 180 number of channels per square inch (CPSI).Catalytic properties of micromonolithic samples (diameter 22 mm and length 50 mm)were tested in NH 3 oxidation process with and without one Pt sheet under atmospheric536