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Beta zeolite supported sol–gel TiO₂ materials for gas phase photocatalytic applications
- Lafjah, Mama, Djafri, Fatiha, Bengueddach, Abdelkader, Keller, Nicolas, Keller, Valérie
- Journal of hazardous materials 2011 v.186 no.2-3 pp. 1218-1225
- temperature, gases, ultraviolet radiation, titanium, methanol, surface area, titanium dioxide, zeolites, oxidation, nanoparticles, photocatalysts, sol-gel processing
- Beta zeolite supported sol–gel TiO₂ photocatalytic materials were prepared according to a sol–gel route in which high specific surface area Beta zeolite powder was incorporated into the titanium isopropoxide sol during the course of the sol–gel process. This led to an intimate contact between the zeolite surface and the TiO₂ precursors, and resulted in the anchorage of large amounts of dispersed TiO₂ nanoparticles and in the stabilization of TiO₂ in its anatase form, even for high TiO₂ wt. contents and high calcination temperatures. Taking the UV-A photocatalytic oxidation of methanol as gas phase target reaction, high methanol conversions were obtained on the Beta zeolite supported TiO₂ photocatalysts when compared to bulk sol–gel TiO₂, despite lower amounts of TiO₂ within the photoactive materials. The methanol conversion was optimum for about 40wt.% TiO₂ loading and calcination temperatures of 500–600°C.