Abstract
The stability of nanosized catalysts at high temperature is still a challenging topic and is a crucial criterion to evaluate their suitability for industrial use. Currently, the strategy to improve the high-temperature stability of nano-sized catalysts is to restrict the migration of particles on the surface, which, however, lacks theoretical knowledge and directions. Herein, we reported a new approach that can effectively inhibit the migration and agglomeration of supported nanoparticles by fabrication of a model catalyst Pt/CeO2/NiAl2O4/Al2O3@SiO2. This catalyst is highly stable with the microstructure unchanged even after being aged at 1000 °C. Density functional theory calculations indicate that two types of confinement effects exist in the catalyst and their mechanisms were well explained from the viewpoint of “energy traps” which can also be applied to other supported catalysts.
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Acknowledgements
This work was supported by the National Key Research and Development Program of China (2016YFC0204301), the National Natural Science Foundation of China (21872133, 21273221) and Youth Innovation Promotion Association of Chinese Academy of Sciences (2018263).
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Li, J., Li, K., Sun, L. et al. Sinter-resistant and high-efficient Pt/CeO2/NiAl2O4/Al2O3@SiO2 model catalysts with “composite energy traps”. Sci. China Chem. 63, 519–525 (2020). https://doi.org/10.1007/s11426-019-9678-5
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DOI: https://doi.org/10.1007/s11426-019-9678-5