Atomically dispersed MoNi alloy catalyst for partial oxidation of methane.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 38821951.
- Also identified by DOI 10.1038/s41467-024-49038-x and PMC identifier 11143339.
- 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 catalytic partial oxidation of methane (POM) presents a promising technology for synthesizing syngas. However, it faces severe over-oxidation over catalyst surface. Attempts to modify metal surfaces by incorporating a secondary metal towards C-H bond activation of CH<sub>4</sub> with moderate O* adsorption have remained the subject of intense research yet challenging. Herein, we report that high catalytic performance for POM can be achieved by the regulation of O* occupation in the atomically dispersed (AD) MoNi alloy, with over 95% CH<sub>4</sub> conversion and 97% syngas selectivity at 800 °C. The combination of ex-situ/in-situ characterizations, kinetic analysis and DFT (density functional theory) calculations reveal that Mo-Ni dual sites in AD MoNi alloy afford the declined O<sub>2</sub> poisoning on Ni sites with rarely weaken CH<sub>4</sub> activation for partial oxidation pathway following the combustion reforming reaction (CRR) mechanism. These results underscore the effectiveness of CH<sub>4</sub> turnovers by the design of atomically dispersed alloys with tunable O* adsorption.