Heterolytic Hydrogenation and H^– Migration-Assisted Hydrodeoxygenation Reaction under Mild Conditions over Pt/TiO₂-D

Abstract

Hydrodeoxygenation of lignin-derived guaiacol to aromatic products under mild conditions was achieved using an interesting Pt/TiO 2 -D catalyst. The defects in TiO 2 -D played a pivotal role in H 2 dissociation and exhibited a unique capability for the migration of active H species on the surface and within the bulk phase of TiO 2 -D, resulting in the formation of a “H reservoir” adjacent to the Pt active sites. Consequently, Pt/TiO 2 -D exhibited superb activity for the cleavage of the C–O bond under extremely low hydrogen concentration (1 atm 10% H 2 /Ar). Moreover, the H − migration into the TiO 2 -D bulk induced the formation of a new Ti 3 O 5 crystalline phase, creating additional defects, which in turn accelerated H 2 activation, the formation of Pt-H species, and the H reservoir, which account for the satisfactory ability of Pt/TiO 2 -D for guaiacol adsorption and C–O cleavage under mild conditions.