Study of catalytic activity and product selectivity of M/Al2O3-CeO2 (M = Pt-Ru, Ru, and Pt) in catalytic wet air oxidation of methylamine

M/Al2O3-CeO2 (M = Pt-Ru, Ru, and Pt) catalysts were prepared using an impregnation method. Their catalytic performance in catalytic wet air oxidation (CWAO) of methylamine was compared. The catalysts were characterized using temperature-programmed reduction, X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron microscopy, N2 adsorption, and CO chemisorption. The experimental results indicated that the dispersion of active species in the Pt-Ru/Al2O3-CeO2 catalyst was greatly improved by the introduction of Pt; therefore, its catalytic performance was significantly enhanced. Temperature-dependent activity showed hysteresis over the catalysts, indicating that CWAO of methylamine followed a chemisorption mechanism.

Graphical AbstractThe Pt-Ru/AlO2-CeO2 catalyst had the best catalytic activity because it had the highest dispersion of active species. The dispersion of bimetallic catalysts can be efficiently promoted by introduction of Pt into Ru/AlO2-CeO2 catalyst.Figure optionsDownload full-size imageDownload as PowerPoint slide