Pt loaded manganese oxide nanoarray-based monolithic catalysts for catalytic oxidation of acetone

Abstract

• Pt loaded MnNA monolithic catalyst were prepared for the removal of VOCs. • Pt-MnNA-P exhibited the best catalytic performance in the removal of acetone with a T 90 of 220 °C. • Pt-MnNA-P could keep its high catalytic activity for at least 48 h and exhibited excellent water resistance ability. • The reduction of Pt particle size and their high dispersion are the keys to the high activity of the Pt-MnNA-P. For large-scale application, increasing the activity of monolithic catalysts at low temperatures and achieving the high utilization efficiency of noble metal oxides remain formidable challenges. In this study, MnO 2 nanoarrays (MnNA) coated on honeycomb cordierite were prepared, and Pt nanoparticles were loaded on their surface. The probe reaction (oxidation of acetone) was set to explore their catalytic activities. By increasing the dispersion of Pt, the catalytic activity can be further improved with a T 50 of 189 °C and T 90 of 220 °C, which also exhibited water-resistance stability for 42 h. In this paper, the dispersed Pt particles can improve the activity of surface lattice oxygen of MnO 2 nanoarrays, and the possible reaction paths were subsequently discussed. This work offers a direct case for interpreting the catalytic behavior of MnNA coated on honeycomb cordierites, which could potentially promise broader insights into the construction and application of nanoarray structures in environmental engineering.