期刊
COMMUNICATIONS CHEMISTRY
卷 2, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s42004-019-0129-0
关键词
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资金
- National Natural Science Foundation of China [21878283, 21576251, 21573232, 21676269]
- Youth Innovation Promotion Association CAS [2017223]
- Strategic Priority Research Program of the Chinese academy of Sciences [XDB17020100]
- National Key projects for Fundamental Research and Development of China [2016YFA0202801]
Minimizing the use of precious metal remains a challenge in heterogeneous catalysis, such as platinum-based catalysts for formaldehyde oxidation. Here we report the catalyst system Pt/TiO2 with low platinum loading of 0.08 wt%, orders of magnitude lower than conventional catalysts. A volcano-like relationship is identified between reaction rates of formaldehyde and platinum sizes in a scale of single-atoms, nanoclusters and nanoparticles, respectively. Various characterization techniques demonstrate that platinum nanoclusters facilitate more activation of O-2 and easier adsorption of HCHO as formates. The activated O facilitates the decomposition of formates to CO2 via a lower reaction barrier. Consequently, this size platinum with such low loading realizes complete elimination of formaldehyde at ambient conditions, outperforming single-atoms and nanoparticles. Moreover, the platinum nanoclusters exhibit a good versatility regardless of supporting on active FeOx or inert Al2O3 for formaldehyde removal. The identification of the most active species has broad implications to design cost-effective metal catalysts with relatively lower loadings.
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