School of Chemistry and Chemical Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang212013, P. R. China.
Shanghai Institute of Ceramics, Chinese Academy of Sciences, 585 Heshuo Road, Shanghai201899, P. R. China.
Inorg Chem. 2023 Jan 16;62(2):904-915. doi: 10.1021/acs.inorgchem.2c03731. Epub 2023 Jan 4.
Formaldehyde (HCHO) is a hazardous pollutant in indoor space for humans because of its carcinogenicity. Removing the pollutant by MnO-based catalysts is of great interest because of their high oxidation performance at room temperature. In this work, we regulate the Pt-MnO (MnO = manganese oxide) interaction and interface by embedding Pt in MnO (Pt-in-MnO) and by dispersing Pt on MnO (Pt-on-MnO) for HCHO oxidation over Pt-MnO catalysts with trace Pt loading of 0.01 wt %. In comparison to the Pt-in-MnO catalyst, the Pt-on-MnO catalyst has a higher Brunauer-Emmett-Teller surface area, a more active lattice oxygen, more oxygen vacancy activating more dioxygen molecules, more exposed Pt atoms, and noninternal diffusion of mass transfer, which contribute to the higher HCHO oxidation performance. The HCHO oxidation performance is stable over the Pt-MnO catalysts under high space velocity and high moisture humidity conditions, showing great potential for practical applications. This work demonstrates a more effective Pt-dispersed MnO catalyst than Pt-embedded MnO catalyst for HCHO oxidation, providing universally important guidance for metal-support interaction and interface regulation for oxidation reactions.
甲醛（HCHO）是室内空间对人类具有致癌性的有害污染物。由于 MnO 基催化剂在室温下具有较高的氧化性能，因此通过该催化剂去除污染物具有重要意义。在这项工作中，我们通过将 Pt 嵌入 MnO（Pt-in-MnO）和将 Pt 分散在 MnO（Pt-on-MnO）来调节 Pt-MnO（MnO = 氧化锰）相互作用和界面，用于负载量为 0.01wt%的痕量 Pt 的 Pt-MnO 催化剂上的 HCHO 氧化。与 Pt-in-MnO 催化剂相比，Pt-on-MnO 催化剂具有更高的 Brunauer-Emmett-Teller 表面积、更活跃的晶格氧、更多的氧空位激活更多的氧分子、更多暴露的 Pt 原子以及无内扩散质量传递，这有助于提高 HCHO 的氧化性能。在高流速和高湿度条件下，Pt-MnO 催化剂的 HCHO 氧化性能稳定，显示出在实际应用中的巨大潜力。这项工作证明了对于 HCHO 氧化，Pt 分散的 MnO 催化剂比 Pt 嵌入的 MnO 催化剂更有效，为氧化反应中的金属-载体相互作用和界面调节提供了普遍重要的指导。
