High Pt-mass activity of PtIV1/β-MnO2 surface for low-temperature oxidation of CO under O2-rich conditions. Issue 9 (3rd May 2022)

• Record Type: Journal Article
• Authors: Nagata, Takeshi; Oda, Akira; Yamamoto, Yuta; Ichihashi, Risa; Sawabe, Kyoichi; Satsuma, Atsushi
• Is Part Of: Catalysis science & technology. Volume 12:Issue 9(2022)
• Page Start: 2749
• Page End: 2754
• Publication Date: 2022-05-03
• Subjects: Catalysis -- Periodicals; 541.395
• DOI: 10.1039/d2cy00677d
• Languages: English
• ISSNs: 2044-4753

Abstract

Abstract : We successfully developed a Pt IV single-atom/β-MnO2 composite metal-oxide surface capable of catalyzing CO oxidation with the record reaction rates of 0.676 and 0.206 molCO h −1 gPt −1 at 25 °C and 0 °C, respectively, under the O2 -rich conditions. Abstract : A Pt-based CO oxidation catalyst that works even at low temperatures is desirable for industrial applications; however, its development is highly challenging because of Pt's high affinity toward CO. Here, we develop a Pt IV single-atom/β-MnO2 composite metal-oxide surface (PtIV1/β-MnO2 ). Single Pt IV sites were stably formed on the high surface β-MnO2 by strong interaction with Mn IV defect sites. The resulting Pt IV –O–Mn IV local structures served the lattice oxygens as an oxidant to catalyze low-temperature oxidation of CO. PtIV1/β-MnO2 was highly resistant to CO poisoning because of the high-valence state of the Pt IV single-atom sites. Aided by these geometric and electronic features, the CO oxidation was catalyzed with reaction rates of 0.676 and 0.206 molCO h −1 gPt −1 at 25 °C and 0 °C, respectively, under the O2 -rich conditions (O2 : CO ratio of 66.7). These are record rates in the literature for Pt-based catalyst application for low-temperature CO oxidation under near atmospheric conditions.