Toluene Removal By A Sequential Adsorption-Thermal Catalytic Process On Ag/Hopcalite

Hopcalite supported Ag (wt.%: 0.5; 1; 2; 10)-containing materials were prepared by wet impregnation followed by calcination at 400 degrees C for adsorption-thermal catalytic oxidation of toluene. Based on breakthrough experiments, the duration of the adsorption step was set around 38 min to minimize toluene loss at the outlet of the reactor (<3 mol% of the amount of toluene adsorbed) allowing to determine a dynamic useful adsorption capacity for toluene. Thermal oxidation was performed in a He : O-2 (75 : 25) gaseous mixture from 20 degrees C to 250 degrees C (90 min) to assess the catalytic properties of the bifunctional materials throughout on-line monitoring of unreacted toluene and CO2 during the temperature programmed reaction. Hop-0.5 Ag exhibited the best performance with a CO2 yield of 98.9 %. Excellent redox properties and minimization of thermal effects were invoked to enhance total oxidation of toluene. Additionally, these bifunctional materials showed good stability under cycling conditions.

Automated summary

Hopcalite supported Ag-containing materials with different Ag concentrations were prepared and used for the adsorption-thermal catalytic oxidation of toluene. Among them, Hop-0.5 Ag exhibited the best catalytic performance and stability.