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- W2067917688 abstract "Rh/CeO2–ZrO2 and Rh/ZrO2 catalysts were prepared by impregnation method and aged in air and N2 atmospheres at 1050 °C. The nanostructure, oxidation state, and redox properties of rhodium were characterized by X-ray diffraction, CO chemisorption, H2 temperature–programmed reduction, transmission electron microscopy, and X-ray photoelectron spectroscopy. The catalytic activity of the catalysts was evaluated by a (CO + NO) probe reaction. The oxidation state and sintering of rhodium nanoparticles were highly influenced by the support and ageing atmosphere. Rhodium species mainly existed as rhodium oxides after air ageing and as more active metallic rhodium after N2 ageing. Owing to the Rh–support interaction, i.e., Rh–ceria or Rh–zirconia interaction, smaller rhodium particles were obtained in the air-aged samples when compared with those in the N2-aged samples. The presence of RhOCe bonds inhibited the sintering of rhodium particles, however, only in an oxygen-containing atmosphere and easily stabilized the high oxidation state of rhodium nanoparticles, leading to catalyst deactivation. Contrarily, Rh–zirconia interaction effectively inhibited the sintering of rhodium particles and preserved the low oxidation state of rhodium nanoparticles with high redox property as active reaction sites after ageing. Consequently, Rh/ZrO2 displayed superior ageing resistance than Rh/CeO2–ZrO2, thereby making ZrO2 a better support for rhodium than ceria-based supports in automotive three-way catalysts." @default.
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- W2067917688 title "Metal-support interaction in automotive exhaust catalysts: Rh-washcoat interaction" @default.
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- W2067917688 doi "https://doi.org/10.1016/0021-9517(80)90406-6" @default.
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