Synergistic interaction of metal–acid sites for phenol hydrodeoxygenation over bifunctional Ag/TiO2 nanocatalyst

doi:10.1016/j.cjche.2018.08.028

Abstract

Abstract: The use of silver metal for hydrodeoxygenation (HDO) applications is scarce and different studies have indicated of its varying HDO activity. Several computational studies have reported of silver having almost zero turnover frequency for HDO owing to its high C-O bond breaking energy barrier and low carbon and oxygen binding energies. Herein this work, titania supported silver catalysts were synthesized and firstly used to examine its phenol HDO activity via experimental reaction runs. BET, XRD, FESEM, TEM, EDX, ICP-OES, Pyridine-FTIR, NH₃-TPD and H₂-TPD analyses were done to investigate its physicochemical properties. Phenomena of hydrogen spillover and metal- acid site synergy were examined in this study. With the aid of TiO₂ reducible support, hydrogen spillover and metal-acid site interactions were observed to a certain extent but were not as superior as other Pt, Pd, Ni-based catalysts used in other HDO studies. The experimental findings showed that Ag/TiO₂ catalyst has mediocre phenol conversion but high benzene selectivity which confirms the explanation from other computational studies.

Key words: Silver based catalyst, Physicochemical properties, Hydrogen spillover, Metal&ndash, acid sites, Hydrodeoxygenation

摘要： The use of silver metal for hydrodeoxygenation (HDO) applications is scarce and different studies have indicated of its varying HDO activity. Several computational studies have reported of silver having almost zero turnover frequency for HDO owing to its high C-O bond breaking energy barrier and low carbon and oxygen binding energies. Herein this work, titania supported silver catalysts were synthesized and firstly used to examine its phenol HDO activity via experimental reaction runs. BET, XRD, FESEM, TEM, EDX, ICP-OES, Pyridine-FTIR, NH₃-TPD and H₂-TPD analyses were done to investigate its physicochemical properties. Phenomena of hydrogen spillover and metal- acid site synergy were examined in this study. With the aid of TiO₂ reducible support, hydrogen spillover and metal-acid site interactions were observed to a certain extent but were not as superior as other Pt, Pd, Ni-based catalysts used in other HDO studies. The experimental findings showed that Ag/TiO₂ catalyst has mediocre phenol conversion but high benzene selectivity which confirms the explanation from other computational studies.

关键词: Silver based catalyst, Physicochemical properties, Hydrogen spillover, Metal&ndash, acid sites, Hydrodeoxygenation

Andrew Ng Kay Lup, Faisal Abnisa, Wan Mohd Ashri Wan Daud, Mohamed Kheireddine Aroua. Synergistic interaction of metal–acid sites for phenol hydrodeoxygenation over bifunctional Ag/TiO₂ nanocatalyst[J]. Chin.J.Chem.Eng., 2019, 27(2): 349-361.

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Synergistic interaction of metal–acid sites for phenol hydrodeoxygenation over bifunctional Ag/TiO₂ nanocatalyst

Synergistic interaction of metal–acid sites for phenol hydrodeoxygenation over bifunctional Ag/TiO₂ nanocatalyst

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