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

High-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% O-2 in N-2), 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 similar to 30% and CO2 of similar to 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.

Automated summary

High-silica zeolite adsorbents (ZAs) are used for plasma catalytic removal of toluene in cycled storage-discharge mode. At 5 min discharge time, toluene conversion reaches 100% with 22% CO and 26% CO2 selectivities. After 20 min discharge time, the selectivities to CO and CO2 become approximately 30% and 60% respectively. A tandem effect of in-plasma ZA and postplasma Au catalysts achieves nearly 100% CO2 selectivity for complete oxidation of toluene to CO2, with investigations on the dependence of the tandem effect on Au loading and space velocity ratio of ZA to Au catalyst.