Isotopic Oxygen Exchange Study to Unravel Noble Metal Oxide/Support Interactions: The Case of RuO2 and IrO2 Nanoparticles Supported on CeO2, TiO2 and YSZ,ChemCatChem

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Isotopic Oxygen Exchange Study to Unravel Noble Metal Oxide/Support Interactions: The Case of RuO2 and IrO2 Nanoparticles Supported on CeO2, TiO2 and YSZ
ChemCatChem ( IF 3.8 ) Pub Date : 2020-03-19 , DOI: 10.1002/cctc.201902187
Yasmine M. Hajar ₁ , Antoinette Boreave ₂ , Angel Caravaca ₂ , Philippe Vernoux ₂ , Elena A. Baranova ₁

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The aim of this study is to unravel the mechanism of (noble metal oxide)/(active support) interactions for catalytic purposes. Hence, isotopic oxygen exchange (IOE) tests were performed on Iridium‐ and ruthenium‐based oxides supported on cerium oxide (CeO₂), titanium oxide (TiO₂), and yttria‐stabilized zirconia (YSZ). IOE tests demonstrated the metal oxide support involvement in the propane oxidation reaction, with YSZ‐based catalysts showing the highest exchange rate of oxygen, while CeO₂ and TiO₂‐based catalysts had a less diffusion of lattice oxygen in that order. This is related to the presence of extrinsic oxygen vacancies in the YSZ‐based catalysts and the reduction ability of the CeO₂ and TiO₂ supports. Despite the limitations on oxygen exchange in some of the noble/metal oxide catalysts, their catalytic performance was comparable to the ones that showed a high oxygen exchange. Therefore, active supports results in a higher engagement of oxygen from the support but not in a linear correlation with the catalytic performance of the metal/support.

中文翻译：

同位素氧交换研究以揭示贵金属氧化物/载体相互作用：以CeO2，TiO2和YSZ负载的RuO2和IrO2纳米颗粒为例

这项研究的目的是阐明用于催化目的的（贵金属氧化物）/（活性载体）相互作用的机理。因此，对负载在氧化铈（CeO ₂），氧化钛（TiO ₂）和氧化钇稳定的氧化锆（YSZ）上的铱和钌基氧化物进行了同位素氧交换（IOE）测试。IOE测试表明，金属氧化物载体参与了丙烷的氧化反应，YSZ基催化剂显示出最高的氧交换速率，而CeO ₂和TiO ₂基催化剂则依次减少了晶格氧的扩散。这与YSZ基催化剂中存在外部氧空位以及CeO ₂和TiO的还原能力有关₂支持。尽管在某些贵金属/金属氧化物催化剂中氧交换受到限制，但它们的催化性能与显示高氧交换的催化剂相当。因此，活性载体导致来自载体的氧的更高结合，但与金属/载体的催化性能没有线性关系。

更新日期：2020-03-19

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