Journal
CERAMICS INTERNATIONAL
Volume 47, Issue 20, Pages 29149-29161Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.07.078
Keywords
Wood-inspired Ce0.7Zr0.3O2; Hierarchical porous structure; Selective catalytic reduction; NO reduction
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Funding
- National Natural Science Foundation of China [31971587]
- Post-doctoral Mobile Research Station of Harbin Sport University
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A novel Ce0.7Zr0.3O2 catalyst with hierarchical porous structure, W-CeZr, was fabricated using a wood template method and utilized for selective catalytic reduction of NO with NH3 for the first time. W-CeZr catalyst exhibited much greater low-temperature activity compared to conventional Ce0.7Zr0.3O2 catalyst (C-CeZr), attributed to increased surface area, enrichment of Ce3+, and enrichment of surface-active oxygen species.
Inspired by natural wood, novel Ce0.7Zr0.3O2 catalyst with hierarchical porous structure, W-CeZr, was fabricated using wood template method by utilizing catheter pores and pits in poplar. W-CeZr catalyst was then used for selective catalytic reduction of NO with NH3 for the first time. Compared with conventional Ce0.7Zr0.3O2 catalyst (C-CeZr), W-CeZr catalyst mimicked biological microstructure of wood and exhibited much greater low-temperature activity than C-CeZr, i.e., NO conversion for W-CeZr was 100% in the range of 250-350 degrees C, while that for C-CeZr was only 58.1% at 250 degrees C. Based on a series of characterization techniques, this effect can be attributed to an increase in surface area (m(2).g(-1)), enrichment of Ce3+, and enrichment of surface-active oxygen species by 133.7%, 60%, and 59.5% compared to C-CeZr, respectively. In situ diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy results show that more activated reactants were present on the surface of W-CeZr because of its stronger surface acidity, as well as redox and oxygen storage abilities.
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