Exceptional Antisintering Gold Nanocatalyst for Diesel Exhaust Oxidation.
basic_science · Level V
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- Record sourced from PubMed, PMID 30192547.
- Also identified by DOI 10.1021/acs.nanolett.8b03003.
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Abstract
The poor thermodynamic stability of gold nanoparticles (NPs) makes it very challenging to stabilize them in small sizes at elevated temperatures. Herein, we report the preparation of antisintering Au nanocatalyst by rationally selecting the sublattice matched MgGa<sub>2</sub>O<sub>4</sub> spinel as support based on theoretical predictions. Au/MgGa<sub>2</sub>O<sub>4</sub> retains Au NPs of 2-5 nm even after aging over the melting temperature of bulk gold (1064 °C)! By identifying the stable structure, the extraordinary stability is found to arise from the formation of a new phase structure, namely Au-MgGa<sub>2</sub>O<sub>4</sub> metal-oxide "hetero-bicrystal" that remains as crystallite without melting even at 1100 °C. More than 80% of the loaded Au can be efficiently stabilized so that the catalysts can exhibit excellent low-temperature activities for diesel exhaust (CO and C<sub>3</sub>H<sub>6</sub>) oxidation after severely thermal and hydrothermal aging. These results may pave ways for constructing antisintering gold nanocatalysts for industrial applications.