High Pt-Mass Activity of PtIV1/β-MnO2 Surface for Low-Temperature Oxidation of CO under O2-Rich Conditions
High Pt-Mass Activity of PtIV1/β-MnO2 Surface for Low-Temperature Oxidation of CO under O2-Rich Conditions
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PtIV1/β-MnO2 表面的高 Pt 质量活性用于富氧条件下 CO 的低温氧化
DOI：
10.1039/d2cy00677d
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
A. Satsuma
中科院分区：
文献类型：
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作者：
T. Nagata;A. Oda;Y. Yamamoto;R. Ichihashi;K. Sawabe;A. Satsuma
即使在低温下也能工作的Pt基CO氧化催化剂对于工业应用是理想的;然而，由于Pt对CO的高亲和力，其开发具有高度挑战性。在这里，我们开发了PtIV单原子/β-MnO 2复合金属氧化物表面（PtIV 1/β-MnO 2）。通过与MnIV缺陷位的强相互作用，在高表面β-MnO 2上稳定地形成单个PtIV位。PtIV-O-MnIV局域结构使晶格氧作为氧化剂催化CO的低温氧化，PtIV 1/β-MnO 2由于PtIV单原子位的高价态而具有很强的抗CO中毒能力。借助这些几何和电子特征，在25 °C和0 °C下，在富氧条件下（O2：CO比为66.7），CO氧化的催化反应速率分别为0.676和0.206 molCO h−1 gPt−1。 这些是文献中用于在近大气条件下低温CO氧化的Pt基催化剂应用的记录速率。
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 PtIV single-atom/β-MnO2 composite metal-oxide surface (PtIV1/β-MnO2). Single PtIV sites were stably formed on the high surface β-MnO2 by strong interaction with MnIV defect sites. The resulting PtIV–O–MnIV 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 PtIV 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.