Gas-phase hydrodeoxygenation (HDO) of guaiacol over Pt/Al2O3 catalyst promoted by Nb2O5

• Published in: Fuel (Guildford) Vol. 287; p. 119509
• Main Authors: Silva, Nathacha Kare G., Ferreira, Rondinele A.R., Ribas, Rogério M., Monteiro, Robson S., Barrozo, Marcos Antonio S., Soares, Ricardo R.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-03-2021; Elsevier BV
• Subjects: Aluminum oxide; Bio-oil upgrading; Catalysts; Catechol; Chemisorption; Continuous flow; Deactivation; Flow system; Gas-phase hydrodeoxygenation (HDO); Guaiacol; Lignin; Niobium oxides; Oxygen; Oxygen content; Partial pressure; Phenol; Phenols; Physicochemical properties; Pt/Nb2O5 catalyst; Pt/NbOx/Al2O3 catalysts; Pyrolysis; Selectivity; Temperature; Vapor phases; Bio-oil upgrading; Guaiacol; Phenol; Gas-phase hydrodeoxygenation (HDO); Pt/NbOx/Al2O3 catalysts; Pt/Nb2O5 catalyst
• ISSN: 0016-2361; 1873-7153
• DOI: 10.1016/j.fuel.2020.119509

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•Pt-supported on Nb2O5-based carrier catalysts.•High performance on Gas-Phase HDO of guaiacol.•HTL or Pyrolysis-derived bio-oil upgrading.
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/Al2O3 formed mainly catechol. The interaction between Pt and NbOx species probably enables oxophilic sites formation which enhances DDO reaction towards phenol formation and less deactivation even at low hydrogen content.