Pt<sub>n</sub>-O<sub>v</sub> synergistic sites on MoO<sub>x</sub>/γ-Mo<sub>2</sub>N heterostructure for low-temperature reverse water-gas shift reaction.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 36192383.
- Also identified by DOI 10.1038/s41467-022-33308-7 and PMC identifier 9530113.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
In heterogeneous catalysis, the interface between active metal and support plays a key role in catalyzing various reactions. Specially, the synergistic effect between active metals and oxygen vacancies on support can greatly promote catalytic efficiency. However, the construction of high-density metal-vacancy synergistic sites on catalyst surface is very challenging. In this work, isolated Pt atoms are first deposited onto a very thin-layer of MoO<sub>3</sub> surface stabilized on γ-Mo<sub>2</sub>N. Subsequently, the Pt-MoO<sub>x</sub>/γ-Mo<sub>2</sub>N catalyst, containing abundant Pt cluster-oxygen vacancy (Pt<sub>n</sub>-O<sub>v</sub>) sites, is in situ constructed. This catalyst exhibits an unmatched activity and excellent stability in the reverse water-gas shift (RWGS) reaction at low temperature (300 °C). Systematic in situ characterizations illustrate that the MoO<sub>3</sub> structure on the γ-Mo<sub>2</sub>N surface can be easily reduced into MoO<sub>x</sub> (2 < x < 3), followed by the creation of sufficient oxygen vacancies. The Pt atoms are bonded with oxygen atoms of MoO<sub>x</sub>, and stable Pt clusters are formed. These high-density Pt<sub>n</sub>-O<sub>v</sub> active sites greatly promote the catalytic activity. This strategy of constructing metal-vacancy synergistic sites provides valuable insights for developing efficient supported catalysts.