Abstract
Pt-based catalysts exhibit unique catalytic properties in many chemical reactions. In particular, metal-support interactions (MSI) greatly improve catalytic activity. However, the current MSI mechanism between platinum (Pt) and the support is not clear enough. In this paper, the interaction of 1 wt% Pt nanoparticles (NPs) on β-MnO(2) in carbon monoxide (CO) oxidation was studied. The Pt on β-MnO(2) inhibited CO oxidation below 210 °C but promoted it above 210 °C. A Pt/β-MnO(2) catalyst contains more Pt(4+) and less Pt(2+). The results of operando DRIFTS-MS show that surface-terminal-type oxygen (M=O) plays an important role in CO oxidation. When the temperature was below 210 °C, Mn=O consumption on Pt/β-MnO(2) was less than β-MnO(2) due to Pt(4+) inhibition on CO oxidation. When the temperature was above 210 °C, Pt(4+) was reduced to Pt(2+), and Mn=O consumption due to CO oxidation was greater than β-MnO(2). The interaction of Pt and β-MnO(2) is proposed.