Activity of Atomically Precise Titania Nanoparticles in CO Oxidation
Yan-Xia Zhao1,2, Meng-Meng Wang3, Yan Zhang3
1State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
Angewandte Chemie (International Ed. in English)
|April 20, 2019
Summary
Stoichiometric titania nanoclusters, (TiO2)nO-, show superior carbon monoxide oxidation activity. This finding highlights their potential for new nanomaterials and supports the Mars-van Krevelen mechanism in titania catalysis.
Area of Science:
- Materials Science
- Nanotechnology
- Catalysis
Background:
- Understanding nanoparticle property evolution is key for designing functional nanomaterials.
- Experimentally studying mixed-element nanoparticles, like metal oxides, presents significant challenges.
Purpose of the Study:
- To measure the carbon monoxide oxidation capability of titania nanocluster anions.
- To investigate how size and stoichiometry affect the oxidative activity of titania nanoparticles.
Main Methods:
- Experimental measurement of carbon monoxide oxidation.
- Gas-phase analysis of titania nanocluster anions (TiO2)nOm- across various sizes (n=1-60) and compositions (m=-3 to 3).
Main Results:
- Stoichiometric (TiO2)nO- clusters demonstrated superior CO oxidation activity compared to non-stoichiometric variants.
- This enhanced activity persisted even for large clusters (n=60), indicating atomic-level influence on chemical behavior.
Conclusions:
- Titania nanoclusters of the formula Ti n O 2n+1 are promising building blocks for advanced nanomaterials with high oxidative activity.
- The study provides molecular-level evidence supporting the Mars-van Krevelen mechanism for CO oxidation on titania.
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