CO oxidation of Pt/CTF samples in presence of water vapor.

This proposal aims to study the effect on water vapor during the CO oxidation reaction over Pt particles dispersed on CaTi1-xFexO3-# support, with x=0, 0.2, 0.3, 0.4. This novel support material shows catalytic activities similar to ceria, converting CO already at room temperature. Interestingly we observe, that the CO conversion is favoured in presence of water vapor in the gas feed (CO+O2+H2O, “wet conditions”). We believe that this significant enhance in catalytic performance, is due to the formations of extremely water derived active species (e.g hydroxyl and/or carboxyl) on top of the Pt nanoparticles and to strong metal-support interaction (creation of Pt-Fe bonds). Using operando photon-in/photon-out spectroscopy we will study the electronic structure and local coordination of Fe and Pt.

本研究旨在探究水蒸气对分散于CaTi₁₋ₓFeₓO₃₋#载体（x=0、0.2、0.3、0.4）上的Pt颗粒催化CO氧化反应的影响。这种新型载体材料展现出与二氧化铈（ceria）相似的催化活性，在室温下即可实现CO转化。有趣的是，我们观察到当进料气中存在水蒸气时（CO+O₂+H₂O，即‘湿条件’），CO转化反应更易进行。我们认为，催化性能的显著提升归因于Pt纳米颗粒表面形成的水衍生活性物种（如羟基（hydroxyl）和/或羧基（carboxyl）），以及强烈的金属-载体相互作用（Pt-Fe键的生成）。我们将利用原位光子进/光子出光谱（operando photon-in/photon-out spectroscopy）研究Fe和Pt的电子结构及局部配位环境。