title: Vapour phase hydrogenation of phenol over rhodium on SBA-15 and SBA-16.
abstract: In the present work, mesoporous SBA-15 and SBA-16 were synthesised using classical methods, and their physicochemical properties were investigated by X-ray diffraction (XRD), FTIR, TEM and N2 adsorption-desorption. Rhodium (Rh, 1 wt %) was loaded on the mesoporous SBA-15 and SBA-16 by an impregnation method. The Rh surface coverage, dispersion and crystallite size were determined by room temperature H2 chemisorption on reduced samples. The catalytic activity of Rh supported on mesoporous SBA-15 and SBA-16 was evaluated for the first time in the hydrogenation of phenol in vapour phase in a temperature range between 130 and 270 °C at atmospheric pressure. The reaction over Rh/SBA-15 at 180 °C produced cyclohexanone as the major product (about 60%) along with lower amounts of cyclohexanol (about 35%) and cyclohexane (about 15%). The influences of temperature, H2/phenol ratio, contact time and the nature of the solvent on the catalytic performance were systematically investigated. The Rh/SBA-16 system offered lower phenol conversion compared to Rh/SBA-15, but both have a very high selectivity for cyclohexanone (above 60%).
authors.affiliation: Departamento de Química, Universidad Nacional de Colombia, Bogotá 110911, Colombia.
authors.forename: Liliana
authors.initials: L
authors.lastname: Giraldo
authors.affiliation: Departamento de Ingeniería Mecánica, Facultad de Ingeniería, Universidad de la Guajira, Riohacha 440001, Colombia.
authors.forename: Marlon
authors.initials: M
authors.lastname: Bastidas-Barranco
authors.affiliation: Grupo de Investigación en Sólidos Porosos y Calorimetría, Departamento de Química, Universidad de los Andes, Bogotá 110911, Colombia. jumoreno@uniandes.edu.co.
authors.forename: Juan Carlos
authors.initials: JC
authors.lastname: Moreno-Piraján
mesh_terms: D000327:Adsorption; D003512:Cyclohexanones / Q000138:chemical synthesis; D006865:Hydrogenation; D019800:Phenol / Q000737:chemistry*; D016062:Porosity; D012238:Rhodium / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013227:Steam; D013499:Surface Properties; D014961:X-Ray Diffraction
chemical_list: D003512:Cyclohexanones; C509969:SBA-15; C000600619:SBA-16; D013227:Steam; D019800:Phenol; C036468:cyclohexanone; D012822:Silicon Dioxide; D012238:Rhodium