Ambient-condition acetylene hydrogenation to ethylene over WS<sub>2</sub>-confined atomic Pd sites.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39487133.
- Also identified by DOI 10.1038/s41467-024-53481-1 and PMC identifier 11530560.
- Licence recorded as CC BY-NC-ND.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Ambient-condition acetylene hydrogenation to ethylene (AC-AHE) is a promising process for ethylene production with minimal additional energy input, yet remains a great challenge due to the difficulty in the coactivation of acetylene and H<sub>2</sub> at room temperature. Herein, we report a highly efficient AC-AHE process over robust sulfur-confined atomic Pd species on tungsten sulfide surface. The catalyst exhibits over 99% acetylene conversion with a high ethylene selectivity of 70% at 25 <sup>o</sup>C, and a record space-time yield of ethylene of 1123 mol<sub>C2H4</sub> mol<sub>Pd</sub><sup>-1</sup> h<sup>-1</sup> under ambient conditions, which is nearly four times that of the typical Pd<sub>1</sub>Ag<sub>3</sub>/Al<sub>2</sub>O<sub>3</sub> catalyst, and exhibiting superior stability of over 500 h. We demonstrate that the confinement of Pd-S coordination induces positively-charged atomic Pd<sup>δ+</sup>, which not only facilitates C<sub>2</sub>H<sub>2</sub> hydrogenation but also promotes C<sub>2</sub>H<sub>4</sub> desorption, thereby enabling a high conversion of C<sub>2</sub>H<sub>2</sub> to C<sub>2</sub>H<sub>4</sub> at room temperature while suppressing over-hydrogenation to C<sub>2</sub>H<sub>6</sub>.