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A Rational Design of the Sintering-Resistant Au-CeO2 Nanoparticles Catalysts for CO Oxidation: The Influence of H2 Pretreatments

机译:抗氧化烧结的Au-CeO2纳米颗粒催化剂的合理设计:H2预处理的影响

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摘要

The redox pretreatment of samples is one of the crucial ways of altering the catalytic properties of the supported noble metal materials in many heterogeneous reactions. Here, H2-reducing pretreatment is reported to enhance the thermal stability of Au-CeO2 catalysts prepared by the deposition–precipitation method and calcination at 600 °C for CO oxidation. In order to understand the improved activity and thermal stability, a series of techniques were used to characterize the physico-chemical changes of the catalyst samples. H2 pretreatment may lead to: (i) a strong metal–support interaction (SMSI) between Au nanoparticles (NPs) and CeO2, evidenced by the particular coverage of Au NPs by CeO2, electronic interactions and CO adsorption changes. (ii) the production of surface bicarbonates which can accelerate CO oxidation. As a result, the H2 pretreatment makes the Au NPs more resistant to sintering at high temperature and enhances the CO oxidation activity. Furthermore, this reduction pretreatment strategy may provide a potential approach to enhance the thermal-stability of other supported noble metal catalysts.
机译:样品的氧化还原预处理是在许多异相反应中改变负载的贵金属材料的催化性能的关键方法之一。在这里,据报道,通过减少H2的预处理可以提高Au-CeO2催化剂的热稳定性,所述Au-CeO2催化剂是通过沉积沉淀法和600°C煅烧的CO氧化制备的。为了理解改进的活性和热稳定性,使用了一系列技术来表征催化剂样品的物理化学变化。 H2预处理可能导致:(i)Au纳米颗粒(NPs)和CeO2之间强烈的金属-载体相互作用(SMSI),这可由CeO2对Au NPs的特殊覆盖,电子相互作用和CO吸附变化来证明。 (ii)产生可加速CO氧化的表面碳酸氢盐。结果,H 2预处理使Au NP更耐高温烧结,并增强了CO氧化活性。此外,该还原预处理策略可以提供增强其他负载型贵金属催化剂的热稳定性的潜在方法。

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