Zhang Tiantian, Xu Jiacheng, Sun Yan, Fang Shiyu, Wu Zuliang, Gao Erhao, Zhu Jiali, Wang Wei, Yao Shuiliang, Li Jing
School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China.
School of Material Science and Engineering, Changzhou University, Changzhou 213164, China.
Molecules. 2023 Sep 29;28(19):6879. doi: 10.3390/molecules28196879.
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 -MnO in carbon monoxide (CO) oxidation was studied. The Pt on -MnO inhibited CO oxidation below 210 °C but promoted it above 210 °C. A Pt/-MnO catalyst contains more Pt and less Pt. 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/-MnO was less than -MnO due to Pt inhibition on CO oxidation. When the temperature was above 210 °C, Pt was reduced to Pt, and Mn=O consumption due to CO oxidation was greater than -MnO. The interaction of Pt and -MnO is proposed.
基于铂的催化剂在许多化学反应中表现出独特的催化性能。特别是,金属-载体相互作用(MSI)极大地提高了催化活性。然而,目前铂(Pt)与载体之间的MSI机制尚不够清晰。本文研究了1 wt%的铂纳米颗粒(NPs)负载在MnO上在一氧化碳(CO)氧化反应中的相互作用。负载在MnO上的Pt在210℃以下抑制CO氧化,但在210℃以上促进CO氧化。Pt/MnO催化剂含有较多的Pt和较少的Pt。原位漫反射红外傅里叶变换光谱-质谱(operando DRIFTS-MS)结果表明,表面端基型氧(M=O)在CO氧化中起重要作用。当温度低于210℃时,由于Pt对CO氧化的抑制作用,Pt/MnO上的Mn=O消耗比MnO少。当温度高于210℃时,Pt被还原为Pt,并且由于CO氧化导致的Mn=O消耗大于MnO。本文提出了Pt与MnO的相互作用。