Catalytic oxidation of volatile organic compounds (VOCs) Oxidation of o-xylene over Pt/HBEA catalysts

摘要

The catalytic oxidation in air of o-xylene in low concentration (1700 ppm) with investigated over pt/HBEA catalysts (framework Si/Al ratio equal to 15 and 50).Whatever the catalyst,o-xylene oxidation is accompanied by the retention of heavy compounds ("coke") within the pores.The higher the reaction temperature,the faster the xylene oxidation and the lower the coke formation.For a given zeolite support,the oxidation rate of o-xylene increases with platinum content.On the other hand,the higher the Si/Al ratio of the zeolite,the faster the o-xylene oxidation.Furthermore,the ctalysts performances were enhanced by pre-reduction of platinum under hydrogen flow showing that Pt~0 species were very active for xylene oxidation.