Kinetics of reduction and oxidation reactions for application in catalytic gas–particle-filters

Abstract

Catalytic filters offer the possibility to combine the functions of a catalytic reactor and a gas–particle filter within one process step. In this way, plant complexity may be reduced, which is of economical interest for small- to medium-size biomass combustion plants. SiC materials seem attractive for catalytic activation as they exhibit high heat conductivity and good thermal shock resistance properties. Furthermore, SiC filter candles are coated with a dense mullite membrane (SiO 2–Al 2O 3 coating), which protects the inner porous, catalytic filter support material against any catalyst poisons carried by the particles. Within this research, filter candles based on SiC, manufactured and impregnated with V 2O 5–TiO 2–WO 3 catalysts by Pall–Schumacher, are investigated with respect to catalytic reactions in gas cleaning. For a better kinetic analysis also accordingly catalytic impregnated SiC grains were investigated in a fixed bed reactor.