Supported ultralow loading Pt catalysts with high H2O-, CO2-, and SO2-resistance for acetone removal.

Supported 0.05 wt% Pt catalysts, prepared via an in situ molten salt method, show high catalytic activity for acetone removal. Ce-, V-, or W-doping increases the amount of surface acid sites, and then enhances H 2 O-, CO 2 -, and SO 2 -tolerance of 0.05 wt% Pt/TiO 2. The present Pt catalysts might be suitable for oxygenated VOCs removal. • Supported 0.05 wt% Pt catalysts are prepared using an in situ molten salt method. • Supported 0.05 wt% Pt catalysts show high catalytic activity for acetone removal. • Ce-, V-, or W-doping enhance H 2 O-, CO 2 -, and SO 2 -tolerance of 0.05 wt% Pt/TiO 2. • Surface acidity greatly influences SO 2 tolerance of supported 0.05 wt% Pt catalyst. • The present Pt catalysts might be suitable for oxygenated VOCs removal. Volatile organic compounds (VOCs) cause damage to atmospheric environment and human health. Supported noble metal catalysts are widely used to control VOCs emissions. The high cost, and low H 2 O-, CO 2 -, and SO 2 -resistance of such catalysts are worthy to be improved. Herein we fabricated Ce-, V-, or W-doped TiO 2 supported ultralow loading Pt catalysts via the in-situ molten salt method, and evaluated their catalytic performance for acetone (major pollutants in pharmaceutical industry) removal. Under the present reaction conditions, all the catalysts exhibited high catalytic activity and stability for acetone oxidation, with the temperature required 90% acetone conversion being of 245 °C over 0.57 wt% CeO 2 -0.05 wt% Pt/TiO 2. The doping of Ce, V, or W enhanced the H 2 O-, CO 2 -, and SO 2 -tolerance ability of 0.05 wt% Pt/TiO 2. More than 85 %85%, 70%, or 60% of acetone could be removed even in the presence of 20 vol% water vapor, 10 vol% CO 2 , or 100 ppm SO 2 , respectively. The improvement in SO 2 -tolerance ability was due to the inhibition of SO 2 adsorption and oxidation activity as well as Ti(SO 4) 2 or TiOSO 4 formation. Acetone complete oxidation over 0.57 wt% CeO 2 -0.05 wt% Pt/TiO 2 would follow the pathway: adsorbed acetone molecules → acetic acid and formic acid → carbonate species → CO 2 and H 2 O. The present supported Pt catalysts might be suitable for oxygenated VOCs removal. [ABSTRACT FROM AUTHOR]