title: Cumene hydroperoxide hydrogenation over Pd/C catalysts.
abstract: Pd/C catalysts were prepared by wet impregnation using K(2)PdCl(4) as precursor and their performance in hydrogenation of cumene hydroperoxide (CHP) was investigated. The catalytic activity was examined on the formaldehyde-reduced and on the hydrogen-reduced Pd/C catalysts. Results from XRD, TEM and CO chemisorption showed that reduction methods have a significant impact on the palladium particles size of resulting catalysts. Formaldehyde-reduced Pd/C catalyst has larger palladium particles than hydrogen-reduced Pd/C catalyst. Consequently, higher activity but lower selectivity to alpha-cumyl alcohol (CA) was obtained on formaldehyde-reduced Pd/C catalyst. Moreover, hydrogenation of CHP over hydrogen-reduced Pd/C catalyst can give similar CA selectivity to Na(2)SO(3) reduction process, an industrial process for CA production. High rate of CHP conversion and CA selectivity can be obtained at an elevated temperature and H(2) pressure. Kinetics studies revealed that CHP hydrogenation is zero-order for CHP concentration and the activation energy was calculated to be 13.6 kJ/mol.
authors.affiliation: State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, PR China.
authors.forename: Qing-cai
authors.initials: QC
authors.lastname: Zhu
authors.forename: Ben-xian
authors.initials: BX
authors.lastname: Shen
authors.forename: Hao
authors.initials: H
authors.lastname: Ling
authors.forename: Rong
authors.initials: R
authors.lastname: Gu
mesh_terms: D000327:Adsorption; D000438:Alcohols / Q000737:chemistry; D001555:Benzene Derivatives / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D002627:Chemistry, Physical / Q000379:methods*; D006859:Hydrogen / Q000737:chemistry; D006865:Hydrogenation; D007700:Kinetics; D046529:Microscopy, Electron, Transmission / Q000379:methods; D015233:Models, Statistical; D010165:Palladium / Q000737:chemistry*; D011312:Pressure; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D000438:Alcohols; D001555:Benzene Derivatives; D010165:Palladium; D002244:Carbon; D006859:Hydrogen; C007164:cumene hydroperoxide