Industrial air treatment - heterogeneous photocatalysis development

摘要

New titanium dioxide (TiO_2) based catalysts were prepared by impregnating commercial zeolites in pellet form using a sol-gel technique. Modifications of surface area and adsorption properties were checked using BET measurements, together with single component adsorption equilibrium experiments for two model volatile organic compounds. Scanning electron microscopy investigations testified that TiO_2 happened to fix on the inert binder leading to a close intimacy of mixing with the zeolites crystallites. A diffusion cell was used to produce dilute polluted airstreams for dynamic experiments, in which adsorption and photodegradation phases were alternatively carried out. Regeneration of adsorbent was evaluated regarding experimental conditions. Through a comparison with previous results obtained on impregnated mesoporous borosilicate beads, it was clarified that zeolite supports had no effect on butanol photooxidation mechanisms.