Details

Autor(en) / Beteiligte

• Jones, John
• Xiong, Haifeng
• DeLaRiva, Andrew T.
• Peterson, Eric J.
• Pham, Hien
• Challa, Sivakumar R.
• Qi, Gongshin
• Oh, Se
• Wiebenga, Michelle H.
• Hernández, Xavier Isidro Pereira
• Wang, Yong
• Datye, Abhaya K.

Titel

Thermally stable single-atom platinum-on-ceria catalysts via atom trapping

Ist Teil von

• Science (American Association for the Advancement of Science), 2016-07, Vol.353 (6295), p.150-154

Ort / Verlag

United States: American Association for the Advancement of Science

Erscheinungsjahr

2016

Quelle

American Association for the Advancement of Science

Beschreibungen/Notizen

• Catalysts based on single atoms of scarce precious metals can lead to more efficient use through enhanced reactivity and selectivity. However, single atoms on catalyst supports can be mobile and aggregate into nanoparticles when heated at elevated temperatures. High temperatures are detrimental to catalyst performance unless these mobile atoms can be trapped. We used ceria powders having similar surface areas but different exposed surface facets. When mixed with a platinum/aluminum oxide catalyst and aged in air at 800°C, the platinum transferred to the ceria and was trapped. Polyhedral ceria and nanorods were more effective than ceria cubes at anchoring the platinum. Performing synthesis at high temperatures ensures that only the most stable binding sites are occupied, yielding a sinter-resistant, atomically dispersed catalyst.