Due to the competitive adsorption of water and reactants at the active sites, especially the water toxicity of platinum-based single-atom catalysts, it is of great importance to improve the low-temperature activity and the water resistance of catalysts for the catalytic combustion of benzene. In this work, it was found that constructing a SiO shell layer on the catalyst not only "immobilized" the Pt single atoms, but also effectively weakened the adsorption of HO on the Pt active sites, which resulted in excellent water resistance of the Pt single-atom catalysts. The comprehensive characterization results demonstrated that the participation of water molecules in the catalytic oxidation reaction of benzene could be effectively promoted by enhancing the strong metal-support interactions (SMSI) at the core-shell interface, which would change the electronic structure of the catalyst surface. As a result, the Pt/CeO@SiO-4 catalyst with a Pt-O-Si active interface exhibits good activity (T = 190 °C) as well as excellent water resistance under the wet condition (10 vol%). This project provides a promising strategy for the design of Pt-based core-shell catalysts with excellent water resistance.

中文翻译：

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二氧化硅辅助 Pt1/CeO2 单原子催化剂通过诱导 H2O 活化增强 VOC 催化燃烧性能


由于水和反应物在活性位点的竞争吸附作用，特别是铂基单原子催化剂的水毒性，提高催化剂的低温活性和耐水性对于催化燃烧具有重要意义。苯。本工作发现，在催化剂上构建SiO壳层不仅“固定”了Pt单原子，而且有效削弱了H2O在Pt活性位点上的吸附，从而使Pt单原子具有优异的耐水性。 -原子催化剂。综合表征结果表明，通过增强核壳界面的强金属-载体相互作用（SMSI），可以有效促进水分子参与苯的催化氧化反应，从而改变催化剂表面的电子结构。结果，具有Pt-O-Si活性界面的Pt/CeO@SiO-4催化剂表现出良好的活性（T = 190℃）以及在潮湿条件（10vol%）下优异的耐水性。该项目为具有优异耐水性的铂基核壳催化剂的设计提供了一种有前途的策略。