Selective Catalysis in Ethylene Oxidation Processes

Ethylene oxide production by partial oxidation of ethylene remains a pillar of the chemical industry, underpinning manufacture of antifreeze, detergents and polymers. The challenge lies in maximising epoxide yield while suppressing complete combustion to CO2. Silver-based catalysts have dominated owing to their unique balance of activity and selectivity, yet fundamental aspects of oxygen activation and catalyst stability continue to demand refinement. Recent advances focus on precise control of oxygen species at the silver interface, integration of renewable feedstocks and novel process intensification strategies. Improved mechanistic understanding, aided by in situ characterisation and theory, is driving the design of catalysts and reactors that can operate under flexible conditions with reduced greenhouse-gas emissions. Concurrent efforts address catalyst deactivation through sintering or surface corrosion, seeking supports and nanoparticle architectures that maintain high selectivity over prolonged operation. The global significance of these developments extends from lowering carbon footprints in bulk chemical manufacture to enabling distributed, on-demand production aligned with intermittent renewable energy sources.

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Selective Catalysis in Ethylene Oxidation Processes publication trend

The graph below shows the total number of articles in selective catalysis in ethylene oxidation processes across all publications each year (not limited to Nature Index journals).

Technical terms

Selectivity: The proportion of desired epoxide formed relative to total products, indicating efficiency of partial oxidation over complete combustion.

Electrophilic oxygen: Surface oxygen species that preferentially react with ethylene to form epoxide rather than oxidising it to CO₂.

Chemical looping epoxidation: A process using lattice oxygen from a solid oxide to oxidise ethylene, regenerating the oxide in a separate step.

In situ X-ray photoelectron spectroscopy: A surface-sensitive analytical technique that monitors chemical states of catalyst surfaces under actual reaction conditions.

Ostwald ripening: A catalyst deactivation mechanism where smaller particles dissolve and redeposit onto larger ones, leading to loss of active surface area.

References

1. Demonstrating on-demand production of bio-ethylene oxide in a two-step dehydration-epoxidation process with chemical looping operations. Chemical Engineering Journal (2024).
2. Structure and Reactivity of Active Oxygen Species on Silver Surfaces for Ethylene Epoxidation. ACS Catalysis (2024).
3. Influence of atmosphere, interparticle distance and support on the stability of silver on α-alumina for ethylene epoxidation. Journal of Catalysis (2022).