In operando simultaneous ATR-IR/Raman spectroscopic investigation of the catalytic activity of supported Pt, Ru, and Pd catalysts in H/D exchange reactions between H2 and D2O - CNRS - Centre national de la recherche scientifique
Article Dans Une Revue Molecular Catalysis Année : 2023

In operando simultaneous ATR-IR/Raman spectroscopic investigation of the catalytic activity of supported Pt, Ru, and Pd catalysts in H/D exchange reactions between H2 and D2O

Isaline Bonnin
  • Fonction : Auteur
Raphaël Mereau
Karine de Oliveira Vigier
  • Fonction : Auteur
Thierry Tassaing

Résumé

In this study, catalytic H/D exchange experiments have been performed between H2 and D2O catalyzed by supported metal catalysts, namely, Ru/Al2O3, Pt/Al2O3 and Pd/Al2O3 in order to unveil the reaction mechanism at work in the glucose hydrogenation reaction on these supported metal catalysts. The conversion of H2 and D2O towards the formation of the exchange species namely HOD, HD and D2 was investigated using in operando simultaneous ATR-IR/Raman spectroscopy allowing the monitoring of the liquid/gas phase respectively. After 24 h of reaction at 22 °C under 30 bar of H2, it is found that Pt/Al2O3 has the highest efficiency for the H/D exchange between H2 and D2O, followed by Ru/Al2O3 and then Pd/Al2O3. On the other hand, the enhanced activity of Ru/Al2O3 for the hydrogenation of glucose is tentatively assigned to H atoms adsorbed and activated on the Ru surface leading to an Ru-H infrared band located around 1940-1970 cm-1 , that is observed only with Ru/Al2O3. This activated H* could be directly added to the carbon atom of the carbonyl of glucose to give sorbitol in a more efficient way compared to the other metals.
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Dates et versions

hal-04246507 , version 1 (17-10-2023)

Identifiants

Citer

Isaline Bonnin, Raphaël Mereau, Karine de Oliveira Vigier, Thierry Tassaing. In operando simultaneous ATR-IR/Raman spectroscopic investigation of the catalytic activity of supported Pt, Ru, and Pd catalysts in H/D exchange reactions between H2 and D2O. Molecular Catalysis, 2023, 547, pp.113279. ⟨10.1016/j.mcat.2023.113279⟩. ⟨hal-04246507⟩
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