Role of Water on the Structure of Palladium for Complete Oxidation of Methane
Role of Water on the Structure of Palladium for Complete Oxidation of Methane
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DOI：
10.1021/acscatal.0c01069
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发表时间：
2020-05-15
期刊：
影响因子：
12.9
通讯作者：
Artiglia, Luca
中科院分区：
文献类型：
--
作者：
Li, Xiansheng;Wang, Xing;Artiglia, Luca
钯基催化剂是天然气汽车低温甲烷燃烧的理想催化剂。通过常压X射线光电子能谱，我们研究了钯箔暴露于不同的混合物在升高的温度下的反应。水影响催化剂的长期稳定性并阻断活性中心，归因于羟基抑制效应。我们在稳态和瞬态反应条件下研究了这种效应，以了解抑制机制。钯表面上羟基的形成阻断了甲烷活化的位点，推迟了本体中活性钯氧化物相的形成。
Palladium-based catalysts are attractive for methane combustion on natural gas vehicles at low temperature. By means of ambient pressure X-ray photoelectron spectroscopy, we investigated the reaction on a palladium foil exposed to different mixtures at increasing temperature. Water affects the long-term catalyst stability and blocks the active sites, ascribed to the hydroxyl inhibition effect. We investigated such an effect both under steady state and transient reaction conditions to understand the mechanism of inhibition. The hydroxyl formation on the surface of palladium blocks the sites for methane activation, postponing the formation of the active palladium oxide phase in the bulk.