Journal
CERAMICS INTERNATIONAL
Volume 48, Issue 7, Pages 9304-9312Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.12.119
Keywords
Mullite whisker; Soot combustion; Catalyst; Bionic structure
Categories
Funding
- National Natural Science Foundation of China [51678059]
- National Engineering Laboratory for Mobile Source Emission Control Technology [NELMS2019B02]
- Key Research and Development Program of Shaanxi Province [2019GY-179]
- Fundamental Research Funds for the Central Universities [300102298202]
- Open Foundation of the Laboratory of Degraded and Unused Land Consolidation Engineering
- Ministry of Land and Resources [SXDJ2017-1]
- Open Foundation of Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education
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Mullite whiskers were prepared on the wall of cordierite honeycomb ceramics to form a hierarchical microstructure. Co/CZ@M/C sample exhibited good structural stability and stable catalytic performance, showing potential application in the diesel particulate filter field.
Mullite whiskers were prepared on the wall of cordierite honeycomb ceramics using the gas-phase growth method. Subsequently, Co/Ce0.75Zr0.25O2 catalyst was loaded on the mullite whiskers to form hierarchical microstructure by the sol-gel technology for catalytic combustion of soot. Scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform-infrared spectroscopy, X-ray diffraction and Transmission electron microscopy were used to characterize the structural morphology and phase compositions. The filtration capability can be improved by mullite whiskers growth on the wall of cordierite honeycomb ceramics, and the microstructural feature is similar to the pseudostratified ciliated epithelium on the tracheal cavity surface (one section of human respiratory system). The Co/Ce0.75Zr0.25O2 catalyst decreased the ignition temperature of soot particles oxidation, and the cycle stability experiment confirmed that Co/CZ@M/C sample has good structural stability and stable catalytic performance. The high-efficiency filtration and the low-temperature catalytic oxidation of soot particles are combined with the hierarchical microstructure of Co/CZ@M/C, which has potential application in the diesel particulate filter (DPF) field.
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