title: Characteristics and catalytic behavior of Pd catalysts supported on nanostructure titanate in liquid-phase hydrogenation.
abstract: Titanate nanowire (TNW) and nanotube (TNT) structures were synthesized by the hydrothermal reaction using spherical shape anatase TiO2 nanoparticles (TNP) as the starting material and employed as Pd catalyst supports for the liquid-phase selective hydrogenation of 1-heptyne to 1-heptene. Pd dispersion was significantly improved as the specific surface area of the supports increased in the order: Pd/TNT > Pd/TNW >> Pd/TNP. While the hydrogenation rate increased with increasing number of active Pd(0) surface, the selectivity to 1-heptene depended largely on the degree of interaction between Pd and the supports. The catalysts prepared by impregnation method led to a stronger metal-support interaction than those prepared by colloidal route. The selectivity of 1-heptene at complete conversion of 1-heptyne was obtained in the order: I-Pd/TNT > I-Pd/TNP >pd/TNT approximately Pd/TNW > Pd/TNP.
authors.affiliation: Faculty of Engineering, Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Chulalongkorn University, Bangkok 10330, Thailand.
authors.forename: Somjit
authors.initials: S
authors.lastname: Putdee
authors.forename: Okorn
authors.initials: O
authors.lastname: Mekasuwandumrong
authors.forename: Apinan
authors.initials: A
authors.lastname: Soottitantawat
authors.forename: Joongjai
authors.initials: J
authors.lastname: Panpranot