Journal
MATERIALS RESEARCH BULLETIN
Volume 141, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2021.111341
Keywords
kappa-Ce2Zr2O8 structure; Pyrochlore-type structure; Metal-support interaction; Three-way catalysts (TWCs); Ceria-zirconia nanomaterials
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Funding
- National Natural Science Foundation of China [21972097]
- Important Science and Technology Program of Sichuan Province of China [2020KJT0022-2019ZDZX0025]
- Sichuan Science and Technology Program [2019YFS0513-2019YFS0498]
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The highly active kappa-Ce2Zr2O8 phase introduced into TWCs strengthened the Pd-CZ interaction, leading to stable activity towards NO and C3H8 conversion.
Severe air pollution is pushing towards developing more efficient three-way catalysts (TWCs), especially for the elimination of NO and C3H8. In this work, the highly active kappa-Ce2Zr2O8 phase was investigated and introduced into TWCs. First, we demonstrated that the cation-ordered pyrochlore-type structure was formed during severe reduction, accompanied by a Zr-rich surface as detected by CH3OH-FTIR. Although only partial kappa-Ce2Zr2O8 nano-domains were observed by HRTEM, which nucleated within the fluorite matrix of CZ-950RO, they acted as a blasting fuse to boost the whole reduction. Moreover, the presence of kappa-Ce2Zr2O8 phase strengthened Pd-CZ interaction, providing a route to generate highly reactive Pd delta+ (delta >= 3) and immobilize palladium nanoparticles through Pd-O-Ce bonds as evidenced by XPS and CO chemisorption. Thanks to the strengthened Pd-CZ interaction, Pd/950RO exhibited a stable activity toward NO and C3H8 conversion.
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