The present study elucidates new perspectives regarding the Pt–CeO2 system for CO oxidation. The successful deposition of highly dispersed Pt–CeO2 species onto the surface of multiwalled carbon nanotubes (MWCNTs) led to the formation of abnormally active and water‐resistant catalysts. The catalysts were investigated by structural (XRD, TEM), spectral (XPS), and kinetic (TPR–CO+O2, TPR–CO, TPR–H2) methods. The application of TPR–CO+O2 revealed the remarkably high activity of all Pt–CeO2/MWCNTs catalysts at temperatures below 0 °C. The study of the catalysts at ambient temperature demonstrated high CO conversion in the presence of water vapor at a concentration of 100 ppm CO. The experimental findings suggest that active sites, comprising platinum structures stabilized directly on the surface of MWCNTs, play a pivotal role in the oxidation of CO under humid conditions. A dual–site approach was employed to develop a kinetic model that effectively describes the experimental data. This model provides valuable insights into the mechanism of wet CO oxidation.

中文翻译：

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Pt-CeO2系统的新视角：稳定多壁碳纳米管以提高环境温度下CO氧化的活性和耐水性

本研究阐明了 Pt-CeO2 系统用于 CO 氧化的新观点。高度分散的 Pt-CeO2 物质成功沉积到多壁碳纳米管（MWCNT）表面，形成了异常活性和防水的催化剂。通过结构（XRD、TEM）、光谱（XPS）和动力学（TPR-CO+O2、TPR-CO、TPR-H2）方法对催化剂进行了研究。 TPR-CO+O2 的应用表明所有 Pt-CeO2/MWCNTs 催化剂在低于 0 °C 的温度下都具有非常高的活性。在环境温度下对催化剂的研究表明，在浓度为 100 ppm CO 的水蒸气存在下，CO 转化率很高。实验结果表明，由直接稳定在 MWCNT 表面上的铂结构组成的活性位点在CO在潮湿条件下的氧化。采用双位点方法开发了有效描述实验数据的动力学模型。该模型为湿式 CO 氧化机制提供了有价值的见解。