Unraveling the origin of selectivity in oxygenated volatile organic compounds oxidation: Contrasting Mn-based and Pt-based catalysts

Pt-based catalysts exhibit a strong negative correlation between oxidation efficiency and OVOC carbon chain length. • Mn-based catalysts maintain stable oxidation performance across OVOCs with different functional groups. • The catalytic activity of Mn-based catalysts is governed by manganese oxidation states, while that of Pt-based catalysts relies on metal-support interactions that modulate Pt dispersion and oxidation states. • The reaction pathways for OVOCs oxidation are governed by catalyst type and functional group. The catalytic oxidation of oxygenated volatile organic compounds (OVOCs) is highly governed by both their functional groups and catalyst types. However, systematic investigations into the structure-activity and selectivity relationships across different OVOCs and catalyst systems remain limited. In this work, three Pt-based catalysts (Pt/TiO 2 , Pt/Al 2 O 3 , Pt/SiO 2 ) and three Mn-based oxides (MnO 2 , Mn 2 O 3 , Mn 3 O 4 ) were systematically evaluated for the catalytic elimination of four typical OVOCs, namely ethanol, methyl formate, acetone and ethyl acetate. The performance of Pt-based catalysts showed a strong dependence on OVOCs carbon chain length, whereas Mn-based catalysts exhibited broader applicability for OVOCs degradation. The reaction pathway and energy barrier are dictated jointly by the functional groups of the OVOCs and the surface/redox properties of the catalysts. These findings advance the understanding of structure-activity relationships in OVOCs catalytic oxidation and provide crucial guidance for the rational design of high-performance catalysts for targeted VOCs removal. Download: Download high-res image (191KB) Download: Download full-size image