Journal
ACS APPLIED NANO MATERIALS
Volume 5, Issue 7, Pages 10036-10046Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.2c02479
Keywords
HCHO elimination; Pt/CeO2; nanorods; crystallite size; mechanism
Funding
- National Natural Science Fund of China [22078134]
- Senior Talents Start-Up Fund of Jiangsu University [16JDG062]
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This study reports CeO2 nanorods decorated by Pt nanoparticles for HCHO oxidative elimination, and finds a close relationship between oxidation performance and ceria nanorod crystallite sizes, with the catalyst having a ceria crystallite size of 8 nm exhibiting the highest oxidation performance.
Indoor HCHO elimination is of great significance for breathing safety. Herein, we report CeO2 nanorods decorated by Pt nanoparticles for HCHO oxidative elimination. The resultant Pt/CeO2 catalysts show a close relationship between oxidation performance and ceria nanorod crystallite sizes. In comparison to 0.2Pt/CeO2-B and 0.2Pt/CeO2-C catalysts that have ceria crystallite sizes of 11 and 18 nm, respectively, the 0.2Pt/CeO2-A catalyst that has a ceria crystallite size of 8 nm exhibits the highest oxidation performance. From the results of Raman, O-2-TPD, and H-2-TPR analyses, the size-performance relationship is suggested to be contributed from the highest oxygen vacancy, the highest oxygen mobility, and the strongest redox in the 0.2Pt/CeO2-A catalyst because of the smallest ceria size. In situ DRIFTS verifies that mobile oxygen from the ceria surface lattice oxygen activated the oxygen molecules at the oxygen vacancy and the hydroxyl group transformed the intermediates of dioxymethylene and formate species.
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