Boreskov Institute of Catalysis of the Siberian Branch of Russian ...

PP-IV-13The new generation of highly-efficient catalysts for SO 2 oxidation on the base of fiberglasssupports, using platinum and vanadia as active components, was developed. 19 sampleswere synthesized for primary selection (Fig. 1).Fig. 1. Fiber-glass catalysts samplesfor oxidation of sulfur dioxide.The tests of the catalytic efficiency of these catalysts has shown that the highest activity isobserved for the catalysts with platinum mostly present in ionic form. The fiber-glasscatalysts were found to be preliminary characterized with significantly wider temperaturewindow of efficient operation than conventional vanadia catalyst, therefore, fiber-glasscatalysts are much more promising for development of new process with minimized SO 2emissions and much lower capital and operating costs than the similar process on the base ofvanadia catalysts, which are applied currently for flue gas conditioning.On the base of performed comparative technological and technical-economical analysisperformed of different variants of the process arrangement for conditioning of flue gases ofcoal-fired boilers, it was shown that optimal technological decision is the process of sulfurdioxide oxidation in synthetic SO 2 -containing stream in a separate reactor with followingintroduction SO 3 -containing flow into the main coal boiler gas duct. Undoubted benefits ofthis process are: complete independence of the process from flow rate, composition andtemperature of the flue gases; possibility to control SO 3 concentration in the flue gases in thewide range; complete absence of dust in the gas flow; possibility to process gases with highSO 2 concentration, providing low gas flow rate and low catalyst loading; absence oflimitations for the pressure drop of the catalyst bed.The research is performed under the financial support from U.S. EnvironmentalProtection Agency via the International Scientific-Technological Center (ISTC grant #3662).419