Orchestrating Reactive Intermediates: Unlocking Near-Complete Oxidant Utilization in Electrochemical-Thermal Cascade...

Area of Science:

• Chemical Engineering
• Catalysis
• Organic Synthesis

Background:

• Oxime synthesis traditionally uses ammoxidation of ammonia with hydrogen peroxide.
• Alkaline conditions limit oxidant efficiency due to competing hydroperoxide and hydrogen peroxide species.

Purpose of the Study:

• To develop a life cycle control strategy for reactive intermediates in oxime synthesis.
• To improve oxidant efficiency and reaction rates in ammonia-based oxime production.

Main Methods:

• Implemented a continuous electrochemical-thermal cascade system in methanol.
• Coordinated the generation, stabilization, transport, and consumption of ionic hydroperoxide (OOH⁻).
• Concentrated OOH⁻ into a centralized population for controlled reactions.

Main Results:

• Achieved up to 96.8% oxidant utilization efficiency.
• Observed a 60.3% enhancement in oxime synthesis rate compared to conventional methods.
• Demonstrated efficient oxime production directly from ammonia.

Conclusions:

• Established a paradigm for regulating reactive intermediate populations in catalysis.
• Provides guiding principles for designing advanced cascade catalytic systems.
• Offers a route to reengineer traditional chemical manufacturing processes.