Article Dans Une Revue Angewandte Chemie International Edition Année : 2020

High-Density and Thermally Stable Palladium Single-Atom Catalysts for Chemoselective Hydrogenations

Ying Ma
  • Fonction : Auteur
Yujing Ren
  • Fonction : Auteur
Yanan Zhou
  • Fonction : Auteur
Wei Liu
Mark Greiner
  • Fonction : Auteur
Wei Chu
  • Fonction : Auteur
Aiqin Wang
  • Fonction : Auteur
Tao Zhang
Yuefeng Liu
  • Fonction : Auteur

Résumé

Single-atom catalysts (SACs) have shown superior activity and/or selectivity for many energy- and environment-related reactions, but their stability at high site density and under reducing atmosphere remains unresolved. Herein, we elucidate the intrinsic driving force of a Pd single atom with high site density (up to 5 wt %) under reducing atmosphere, and its unique catalytic performance for hydrogenation reactions. In situ experiments and calculations reveal that Pd atoms tend to migrate into the surface vacancy-enriched MoC surface during the carburization process by transferring oxide crystals to carbide crystals, leading to the surface enrichment of atomic Pd instead of formation of particles. The Pd-1/alpha-MoC catalyst exhibits high activity and excellent selectivity for liquid-phase hydrogenation of substituted nitroaromatics (>99 %) and gas-phase hydrogenation of CO(2)to CO (>98 %). The Pd-1/alpha-MoC catalyst could endure up to 400 degrees C without any observable aggregation of single atoms.

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Dates et versions

hal-03409738 , version 1 (29-10-2021)

Identifiants

Citer

Ying Ma, Yujing Ren, Yanan Zhou, Wei Liu, Walid Baaziz, et al.. High-Density and Thermally Stable Palladium Single-Atom Catalysts for Chemoselective Hydrogenations. Angewandte Chemie International Edition, 2020, 59, pp.2-9. ⟨10.1002/anie.202007707⟩. ⟨hal-03409738⟩
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