Selective Conversion NOx Into Isoxazoles via Co-Zn Electrocatalyst Steering the Reaction Pathway.

Area of Science:

• Catalysis
• Electrochemistry
• Materials Science

Background:

• Electrocatalytic upcycling of nitrogen oxides (NOx) into N-heterocycles is desirable but faces challenges in selectivity and activity.
• Existing methods often involve complex reaction pathways and inefficient catalytic processes.

Purpose of the Study:

• To develop a highly selective and efficient strategy for the electrochemical reduction of NOx species into valuable N-heterocycles.
• To explore the use of a novel Co-Zn dual-atom catalyst (Co-Zn-NC) for this transformation.
• To establish a sustainable platform for molecular manufacturing from inorganic nitrogen wastes.

Main Methods:

• Electrochemical reduction of NOx species coupled with 1,3-dicarbonyls using a Co-Zn dual-atom catalyst (Co-Zn-NC).
• Density functional theory (DFT) calculations to investigate the catalyst's electronic structure and reaction mechanisms.
• Adsorption measurements to understand intermediate and product affinities.

Main Results:

• Achieved a remarkable 92% Faraday efficiency for isoxazole production.
• Significantly suppressed the production of hydrogen and ammonia.
• Demonstrated universality across various nitrogen sources (nitrate, nitrite, NO, NO2) and carbon sources (1,3-dicarbonyls).
• DFT calculations revealed regulation of reaction energy barriers and hydrogen adsorption.
• Adsorption measurements indicated moderate affinity for key intermediates and products.

Conclusions:

• The Co-Zn-NC catalyst enables a highly selective and efficient electrocatalytic route for synthesizing isoxazoles from NOx.
• This strategy offers a novel paradigm for creating complex N-O heterocycles from nitrogenous waste.
• The findings establish a new platform for sustainable molecular manufacturing.