Hydroxylated TiO<sub>2</sub>-induced high-density Ni clusters for breaking the activity-selectivity trade-off of CO<sub>2</sub> hydrogenation.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39333511.
- Also identified by DOI 10.1038/s41467-024-52547-4 and PMC identifier 11437244.
- 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
The reverse water gas shift reaction can be considered as a promising route to mitigate global warming by converting CO<sub>2</sub> into syngas in a large scale, while it is still challenging for non-Cu-based catalysts to break the trade-off between activity and selectivity. Here, the relatively high loading of Ni species is highly dispersed on hydroxylated TiO<sub>2</sub> through the strong Ni and -OH interactions, thereby inducing the formation of rich and stable Ni clusters (~1 nm) on anatase TiO<sub>2</sub> during the reverse water gas shift reaction. This Ni cluster/TiO<sub>2</sub> catalyst shows a simultaneous high CO<sub>2</sub> conversion and high CO selectivity. Comprehensive characterizations and theoretical calculations demonstrate Ni cluster/TiO<sub>2</sub> interfacial sites with strong CO<sub>2</sub> activation capacity and weak CO adsorption are responsible for its unique catalytic performances. This work disentangles the activity-selectivity trade-off of the reverse water gas shift reaction, and emphasizes the importance of metal-OH interactions on surface.