Reaction pathways for the HDO of guaiacol over supported Pd catalysts: Effect of support type in the deoxygenation of hydroxyl and methoxy groups

Mechanistic insights on Ru nanoparticle in situ formation during hydrodeoxygenation of lignin-derived substances to hydrocarbons

“…58 The most intense bands in the spectra of the catalyst surface in the substrate flow in the range of 1300–950 cm −1 belong to stretching and bending vibrations at the C–O–C sites, 59 and in the longer-wavelength region of this range (950–1100 cm −1 ), the bands usually lie between the alkyl bonds –O–C (Alk) and C–OH, while above the wavenumber (1200–1300 cm −1 ) there are bands from the –O–C(Ph) bonds. 60 The high intensity of the bands in this spectral range emphasizes the high content of such bonds in the substance and reaction intermediates. In the frequency range 1380–1480 cm −1 , there are bands from deformation vibrations of CH bonds in alkyl groups that are part of the starting substance and the solvent.…”

Hydrodeoxygenation Performance of Lignin-Derived Phenolics to Cycloalkanes: Insights into the Crystal Structures of the Nb2O5 Support

“…20 Therefore, metal oxides that mainly provided oxygen vacancies and had certain acidic properties were considered as advantageous alternative supports, such as Nb 2 O 5 , ZrO 2 , TiO 2 , CeO 2 , and CrO 2 . 21−23 Teles et al 24 studied the deoxidation efficiency in the catalytic HDO of guaiacol over the catalysts with Pd loading on SiO 2 , CeO 2 , ZrO 2 , TiO 2 , and Nb 2 O 5 supports. It was found that the reaction rate and the proportion of deoxidation products followed the order Pd/ Nb 2 O 5 > Pd/TiO 2 > Pd/ZrO 2 > Pd/CeO 2 > Pd/SiO 2 .…”

Hydrocracking Mechanisms of Oxygenated Plastics and Vacuum Gasoil Blends

“…Traditionally, hydrocracking studies on plastic waste valorization have focused on hydrocarbon-based polymers [19,20], whereas heteroatom-containing plastics have gone comparatively unnoticed. However, exploring the latter's potential, especially oxygenated plastics, has clear interest from both the industrial (the presence of heteroatoms can affect hydroprocessing unit operation [21][22][23]) and environmental perspectives, given the heterogeneous composition of MSW. Despite being susceptible to deactivation by poisoning, supported Pt-Pd/HY zeolite catalysts have proven robust if the support material is correctly selected, providing high activity and stability in hydrocracking, especially when dealing with aromatic, waxy, and heteroatom-containing feedstock [24,25].…”