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Design of stable Cu active sites inspired by Hg-based catalysts for acetylene hydrochlorination
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DOI：10.1016/j.cattod.2026.115889.png)
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Abstract
En 中文
The industrial hydrochlorination of acetylene to vinyl chloride monomer (VCM) remains constrained by the indispensable yet environmentally hazardous mercury chloride catalyst. To date, the exceptional activity and long‑term stability of mercury‑based systems have hindered their replacement. Inspired by the performance of mercury-based catalysts, we rationally engineered an environmentally benign and cost‑effective copper‑based alternative. Compared to copper species, the weaker intermolecular interactions and appropriate activation ability of acetylene towards mercury-based catalysts underpin the superior activity and stability. To mimic these traits, coordinating ligands are applied to tune the geometry and electronic structure of copper sites, resulting in increasing the reaction order of acetylene and augmenting the number of accessible active sites. After reaching a plateau in ligand‑mediated strategy, dispersed copper species are achieved by utilizing a defect support to inhibit the aggregation. The designed copper catalyst achieves the deactivation rate of 0.018 percent per hour in a 400-hour stability test, which is comparable to the performance of mercury-based catalysts. This work provides a general principle for balancing site dispersion, electronic modulation and support engineering for designing an effective catalyst.
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