title: Kinetics of lactose and rhamnose oxidation over supported metal catalysts.
abstract: Several mono- and bimetallic Pd, Pt, Rh and Ru supported on alumina and active carbon catalysts were characterized by CO chemisorption, nitrogen adsorption, XPS and XRD and acidity titrations were performed for active carbon supported catalysts. These catalysts were tested in oxidation of two sugars, namely lactose and rhamnose, at 60 °C and at 70 °C under slightly alkaline conditions (pH 8) with molecular oxygen. The results revealed that there is an optimum metal particle size in a range of 3-10 nm giving the highest initial TOFs for both oxidations. Furthermore, the catalytic activities and conversions were related to other catalyst properties, such as the type and amount of promoters and the presence of different phases. In situ catalyst potential measurements revealed that there is an inverse correlation between the increase of catalyst potential as a function of sugar conversion and the catalyst activity after prolonged reaction times. This method is a valuable tool for in situ characterization of catalysts correlating well with their activities.
authors.affiliation: Process Chemistry Centre, Åbo Akademi University, Biskopsgatan 8, FIN-20500 Turku/Åbo, Finland.
authors.forename: Päivi
authors.initials: P
authors.lastname: Mäki-Arvela
authors.forename: Anton V
authors.initials: AV
authors.lastname: Tokarev
authors.forename: Elena V
authors.initials: EV
authors.lastname: Murzina
authors.forename: Betiana
authors.initials: B
authors.lastname: Campo
authors.forename: Teemu
authors.initials: T
authors.lastname: Heikkilä
authors.forename: Jenny-Maria
authors.initials: JM
authors.lastname: Brozinski
authors.forename: Dorit
authors.initials: D
authors.lastname: Wolf
authors.forename: Dmitry Yu
authors.initials: DY
authors.lastname: Murzin
mesh_terms: D002384:Catalysis; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007785:Lactose / Q000737:chemistry*; D008670:Metals / Q000737:chemistry*; D010084:Oxidation-Reduction; D012210:Rhamnose / Q000737:chemistry*
chemical_list: D008670:Metals; D007785:Lactose; D012210:Rhamnose