Plasma catalytic removal of VOCs using cycled storage‐discharge (CSD) mode: Tandem effect of zeolite adsorbents and Au catalysts on complete oxidation of toluene

Abstract

AbstractHigh‐silica zeolite adsorbents (ZAs) are employed for plasma catalytic removal of toluene with cycled storage‐discharge mode in this work. At 5 min discharge time of the discharge stage in air plasma (20% O2 in N2), toluene conversion attains 100%, obtaining 22% CO and 26% CO2 selectivities. After 20 min discharge time, the air plasma gives the selectivities to CO of ~30% and CO2 of ~60%. For complete oxidation of toluene to CO2, ZA and Au catalysts are combined and a tandem effect of in‐plasma ZA and postplasma Au catalysts is achieved, featuring nearly 100% CO2 selectivity at 100% toluene conversion. Dependences of the tandem effect on Au loading and space velocity ratio of ZA to Au catalyst are investigated.