Chapter 3.4 A TG/DTA study of V2O5/TiO2 eurocat catalysts and of their precursors

Abstract Eurocat V 2 O 5 -TiO 2 catalysts containing 1% and 8% vanadia by weight, and their precursors, have been studied by thermogravimetry, differential thermogravimetry and differential thermal analysis. Decomposition of the precursors in air took place in two welldefined steps: the first occurred up to ca. 500 K, and corresponds to removal of water from the solid surface; and CO 2 evolution was observed above this temperature, accompanied by a strong exothermic effect. CO 2 was also detected in a non-oxidising atmosphere. Melting of vanadia was observed only in the V-rich samples, confirming the presence of crystalline V 2 O 5 ; with the 1% sample diffusion of vanadium species probably hindered formation of large crystallites.