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Pt/xNb₂O₅/(100-x)Al₂O₃ (x = 0, 5, 20, 100, wt.%) catalysts were tested on the gas phase hydrodeoxygenation (HDO) of guaiacol (2-methoxyphenol, C₇H₈O₂), model compound representative of the lignin-derived portion of the bio-oil produced after pyrolysis or HTL. The physicochemical properties of the catalysts were analyzed by XRD, N₂ physisorption, CO chemisorption, and temperature programmed desorption of isopropylamine. The catalytic performances were evaluated in a continuous flow system at atmospheric pressure with the aim of reducing the oxygen content of the guaiacol molecule as an upgrading step of the biomass processing. The influence of H₂ partial pressure, temperature, space velocity, and pure supports performance on both activity and selectivity was determined. The Pt/Nb₂O₅ catalyst exhibited superior oxygen removal. Niobia addition enhanced the selectivity towards phenol while Pt …