Chemical Mapping of Nb₂O₅ Catalysts for Hydrodeoxygenaton via XRD-Tomography
Palavras-chave:
Hydrodeoxygenation, X-ray Tomography, Biomass, Synchrotron RadiationResumo
Guaiacol hydrodeoxygenation (HDO) was studied using pelletized X-Nb₂O₅ (X = Ru, Ni, Fe) catalysts to explore structure–activity relations under realistic conditions. Catalysts were prepared by calcination, metal impregnation, and reduction before vapor-phase hydrodeoxygenation at 360 °C. Ru catalysts showed initial activation, while NiFe catalysts deactivated over time due to carbon deposition and possible structural changes, confirmed by SEM. XRD-tomography revealed distinct phase distributions in 3D space within the catalyst pellets, including core–shell structures of Ni⁰ and NiNb₂O₆ influenced by thermal treatment. These structural differences correlated with catalytic activity and selectivity, demonstrating the role of thermal processing and advanced spatial characterization in optimizing pelletized catalysts for biomass upgrading.
Referências
1. G. De Smet; X. Bai; B.U.W. Maes, Chem. Soc. Rev. 2024, 53, 5489–5551.
2. N.K.G. Silva et al., Fuel 2021, 287, 119509.
3. J.E. Peters; J.R. Carpenter; C.D. Dayton, Energy Fuels 2015, 29, 909–916.
4. Q. Chen; H. Xu; H. Li, Sustain. Energy Fuels 2025, DOI: 10.1039/d5se00544b.
5. K.L. Patle; P. Pardhi; S. Pantawane; D.T. Sarve; J. Ekhe; K.L. Wasewar, Catal. Rev. 2025, 1–53, DOI: 10.1080/01614940.2025.2453713.
