Putdee Somjit, Mekasuwandumrong Okorn, Soottitantawat Apinan, Panpranot Joongjai
Faculty of Engineering, Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Chulalongkorn University, Bangkok 10330, Thailand.
J Nanosci Nanotechnol. 2013 Apr;13(4):3062-7. doi: 10.1166/jnn.2013.7403.
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.
以球形锐钛矿型二氧化钛纳米颗粒（TNP）为原料，通过水热反应合成了钛酸纳米线（TNW）和纳米管（TNT）结构，并将其用作钯催化剂载体，用于1-庚炔液相选择性加氢制1-庚烯。随着载体比表面积按Pd/TNT > Pd/TNW >> Pd/TNP的顺序增加，钯的分散度显著提高。虽然加氢速率随着活性Pd(0)表面数量的增加而增加，但对1-庚烯的选择性在很大程度上取决于钯与载体之间的相互作用程度。通过浸渍法制备的催化剂比通过胶体法制备的催化剂具有更强的金属-载体相互作用。在1-庚炔完全转化时，1-庚烯的选择性顺序为：I-Pd/TNT > I-Pd/TNP > pd/TNT ≈ Pd/TNW > Pd/TNP。
