Catalytic Mechanisms in Vinyl Acetate Synthesis

Vinyl acetate monomer is produced industrially by the gas‐phase reaction of acetic acid with acetylene over zinc‐based heterogeneous catalysts, typically zinc acetate supported on activated carbon or other high‐surface‐area materials. The mechanism begins with adsorption of acetic acid onto Lewis acidic Zn2+ centres to form surface acetate species, followed by coordination of acetylene and its insertion into the Zn–O bond, yielding a vinyl‐acetate intermediate. Subsequent β‐hydride elimination liberates the vinyl acetate product and regenerates the active site. Catalytic efficiency depends critically on support properties, surface functional groups and the presence of promoters. Kinetic and temperature‐programmed studies reveal that the rate‐limiting step often involves interaction between acetylene and surface acetyl species. Co‐promoters such as copper, potassium or cobalt are employed to modulate electron density around zinc, suppress sintering and optimise adsorption selectivity. Computational modelling supports spectroscopic insights into the energetic profiles of key intermediates. Recent catalyst designs exploit mesostructured supports, ionic liquid–derived active phases and sustainable carriers to enhance activity, stability and selectivity under milder conditions, thereby improving energy efficiency and environmental performance. These advances aim to deliver more atom‐efficient, low‐emission processes that meet growing global demand for vinyl acetate-based polymers.

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Catalytic Mechanisms in Vinyl Acetate Synthesis publication trend

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Technical terms

Acetylene acetoxylation: Gas-phase reaction of acetylene with acetic acid over a heterogeneous catalyst to produce vinyl acetate.

Lewis acidity: Capacity of a metal centre to accept an electron pair, critical for activating acetic acid on zinc sites.

Promoter: Additive that enhances catalytic activity or selectivity by modifying electronic or structural properties of the active phase.

Activated carbon support: High-surface-area, porous carbon material that disperses zinc acetate and provides adsorption sites for reactants.

Temperature-programmed desorption (TPD): Technique measuring the quantity and strength of adsorbed species as temperature increases, used to probe catalyst–reactant interactions.

References

1. Effect of Oxygen-Containing Group on the Catalytic Performance of Zn/C Catalyst for Acetylene Acetoxylation. Nanomaterials (2021).
2. Preparation of High-Performance Zn-Based Catalysts Using Printing and Dyeing Wastewater and Petroleum Coke as a Carrier in Acetylene Acetoxylation. Catalysts (2023).
3. Performance Study of Zn-Co-Ni/AC Catalyst in Acetylene Acetylation. Catalysts (2021).
4. Zinc Acetate Immobilized on Mesoporous Materials by Acetate Ionic Liquids as Catalysts for Vinyl Acetate Synthesis. Journal of Chemistry (2015).