In the present study, we demonstrate the multiple air purification system consisting of auto-regenerative honeycomb filter coated with the adsorbent and the oxidation catalyst, and photocatalytic honeycomb filter module with the UV(ultraviolet) LED for abatement of VOC(Volatile Organic Compounds) in the air. The VOC in the inflowed air to this system is effectively adsorbed to zeolite while passing the first honeycomb filter, and if the VOC adsorption capacity in zeolites reaches the limit, it is desorbed by the heater for filter regeneration, followed by oxidation to CO2 on surface of Pt/Al2O3 catalyst. The air purified through the primary filter flows to the secondary photocatalytic filters and is repurified by oxidation reaction of remnant VOC to CO2 on Cu2O/TiO2 surfaces. Our approach requires no filter replacement and less thermal energy than conventional oxidation method, and is advantageous for purification of the air with high volume and rapid flux due to the multiple treatment steps.

Highly efficient VOC abatement system with auto-regenerative filters of adsorption and oxidation catalysts

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