title: Hydrodeoxygenation of Guaiacol over Ceria-Zirconia Catalysts.
abstract: The hydrodeoxygenation of guaiacol is investigated over bulk ceria and ceria-zirconia catalysts with different elemental compositions. The reactions are performed in a flow reactor at 1 atm and 275-400 °C. The primary products are phenol and catechol, whereas cresol and benzene are formed as secondary products. No products with hydrogenated rings are formed. The highest conversion of guaiacol is achieved over a catalyst containing 60 mol % CeO2 and 40 mol % ZrO2 . Pseudo-first-order activation energies of 97-114 kJ mol(-1) are observed over the mixed metal oxide catalysts. None of the catalysts show significant deactivation during 72 h on stream. The important physicochemical properties of the catalysts are characterized by X-ray diffraction (XRD), temperature-programmed reduction, titration of oxygen vacancies, and temperature-programmed desorption of ammonia. On the basis of these experimental results, the reasons for the observed reactivity trends are identified.
authors.affiliation: School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Dr., NW, Atlanta, GA, 30332 (USA).|Renewable Bioproducts Institute, Georgia Institute of Technology, Atlanta, GA, 30332 (USA).
authors.forename: Sarah M
authors.initials: SM
authors.lastname: Schimming
authors.affiliation: School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Dr., NW, Atlanta, GA, 30332 (USA).|Micromeritics Instrument Corporation, Norcross, GA, 30093 (USA).
authors.forename: Onaje D
authors.initials: OD
authors.lastname: LaMont
authors.affiliation: School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Dr., NW, Atlanta, GA, 30332 (USA).|Technische Universität München, Catalysis Research Center, 85748 Garching (Germany).
authors.forename: Michael
authors.initials: M
authors.lastname: König
authors.affiliation: School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Dr., NW, Atlanta, GA, 30332 (USA).|National Renewable Energy Laboratory, Golden, CO 80401 (USA).
authors.forename: Allyson K
authors.initials: AK
authors.lastname: Rogers
authors.affiliation: Micromeritics Instrument Corporation, Norcross, GA, 30093 (USA).
authors.forename: Andrew D
authors.initials: AD
authors.lastname: D'Amico
authors.affiliation: National Renewable Energy Laboratory, Golden, CO 80401 (USA).
authors.forename: Matthew M
authors.initials: MM
authors.lastname: Yung
authors.affiliation: School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Dr., NW, Atlanta, GA, 30332 (USA). carsten.sievers@chbe.gatech.edu.|Renewable Bioproducts Institute, Georgia Institute of Technology, Atlanta, GA, 30332 (USA). carsten.sievers@chbe.gatech.edu.
authors.forename: Carsten
authors.initials: C
authors.lastname: Sievers
mesh_terms: D002384:Catalysis; D002563:Cerium / Q000737:chemistry*; D006139:Guaiacol / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D013696:Temperature; D015040:Zirconium / Q000737:chemistry*
chemical_list: D002563:Cerium; C030583:ceric oxide; D006139:Guaiacol; D015040:Zirconium; C028541:zirconium oxide; D010100:Oxygen
keywords: arenes; bio-oil; heterogeneous catalysis; hydrodeoxygenation; oxygen vacancies