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Hypophosphite-Induced Structural Reconstruction Boosts Cu-Based Catalysts for Semi-Hydrogenation of Acetylene in Excess Ethylene
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J
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汤
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DOI：10.1021/acscatal.6c02405.png)
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Abstract
En 中文
Selective semi-hydrogenation of acetylene to ethylene in an ethylene-rich stream is critical for polymer-grade ethylene production. Copper catalysts are cost-effective but limited by aggregation of active sites, inadequate hydrogen activation, and side reactions like C–C coupling and over-hydrogenation. We report a sodium hypophosphite-modified cuprous oxide catalyst (Cu2O-P) that achieves 100% acetylene conversion with 95% ethylene selectivity at 130 °C (H2/C2H2 = 10) and maintains on-stream stability over 130 h. Hypophosphite coordination promotes acetylene adsorption and drives in situ formation of an active copper carbide (CuCx) phase, boosting hydrogen activation and spillover. Also, it reconstructs bulk copper species into highly dispersed copper NPs (∼5 nm) on a carbon support and further isolates the copper sites at the atomic scale, effectively suppressing C–C coupling and carbon deposition. This surface modification strategy provides a simple method to improve activity, selectivity, and stability simultaneously for metal hydrogenation catalysts with low Tammann temperature.
Keywords:
Catalysts
Copper
Hydrocarbons
Selectivity
Sodium
semi-hydrogenation
copper catalysts
acetylene
surface modification
Journal
IF:
13.1
Papers:
1.6W
Citations:
15.0W
Organization
Cited Papers