Saturday , 2 March 2024
Home Science Single-atom-driven dynamic carburization over Pd1-FeOx catalyst boosting CO2 conversion
Science

Single-atom-driven dynamic carburization over Pd1-FeOx catalyst boosting CO2 conversion

Single-atom catalysts (SACs) are featured as an emerging type of heterogeneous catalysts due to their distinct reaction mechanisms. Beyond the conventional understanding, here, we report a dual effect of Pd-FeO SACs in real reactions boosting reverse water-gas shift (rWGS) reactivity. Besides providing single active sites, Pd SAs surprisingly promote the dynamic carburization of FeO surface over a long-term reaction, leading to outstanding rWGS activity (42.0 mmol·g·h) and CO selectivity (>98%) beyond that of other reported Fe-based catalysts. Utilizing state-of-the-art characterization techniques, we reveal that this dynamic carburization yields a highly active FeC phase with the lowest activation barrier of 27.7 kJ/mol for the atmospheric rWGS reaction. The dual effect of SACs results in catalytic performance superior to that of Pd nanoparticles, over which carburization is inhibited by a rapid FeO encapsulation. This work reveals the multiple roles of single atoms in real reactions, indicating the wider application of SACs.

 

Continue reading your article with a FrontPage News Subscription

Already a Subscriber? Sign In  

OR
VIEW SUBSCRIPTION OPTIONS
Support independent journalism by subscribing