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Plasma driven ammonia decomposition on a Fe-catalyst: eliminating surface nitrogen poisoning
Li Wang1, Yue Zhao, Chunyang Liu
1State Key Laboratory of Fine Chemicals, Department of Catalytic Chemistry and Engineering, Dalian University of Technology, Dalian 116024, PR China.
Strongly adsorbed nitrogen atoms hinder ammonia decomposition. Plasma catalysis overcomes this, boosting ammonia conversion significantly. Gas-phase species in plasma aid nitrogen desorption via Eley-Rideal interactions.
Area of Science:
- Chemical Engineering
- Catalysis Science
- Plasma Science
Background:
- Ammonia decomposition is crucial for nitrogen fixation and hydrogen production.
- Strongly adsorbed nitrogen atoms on catalyst surfaces inhibit reaction rates.
- Conventional catalytic methods face limitations in overcoming surface inhibition.
Purpose of the Study:
- To investigate plasma-driven catalysis for enhanced ammonia decomposition.
- To elucidate the mechanism of nitrogen atom desorption.
- To achieve high ammonia conversion rates.
Main Methods:
- Utilizing plasma-driven catalysis to decompose ammonia.
- Employing (15)NH(3) isotope tracing to study reaction pathways.
- Applying optical emission spectroscopy to analyze plasma-generated active species.
Main Results:
- Plasma catalysis dramatically increased ammonia conversion from 7.8% to 99.9%.
- Identified gas-phase active species, including excited ammonia (NH(3)*) and ammonia radicals (NH˙), play a key role.
- Demonstrated that these species facilitate nitrogen atom desorption through an Eley-Rideal (E-R) mechanism.
Conclusions:
- Plasma-driven catalysis effectively overcomes the inhibition caused by strongly adsorbed nitrogen atoms.
- The Eley-Rideal interaction involving gas-phase active species is critical for efficient ammonia decomposition.
- This approach offers a promising pathway for highly efficient ammonia conversion in catalytic processes.
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