Vapour Phase Hydrogenation of Phenol over Rhodium on SBA-15 and SBA-16

Molecules

Liliana Giraldo²  Marlon Bastidas-Barranco¹  Juan Carlos Moreno-Piraján³ 

[1]Departamento de Ingeniería Mecánica, Facultad de Ingeniería, Universidad de la Guajira, Riohacha 440001, Colombia

[2]Departamento de Química, Universidad Nacional de Colombia, Bogotá 110911, Colombia

[3]Grupo de Investigación en Sólidos Porosos y Calorimetría, Departamento de Química, Universidad de los Andes, Bogotá 110911, Colombia

关键词: phenol hydrogenation;    mesoporous materials;    rhodium/SBA;    zeolites;   

DOI  :  10.3390/molecules191220594

来源: mdpi

【 摘 要 】

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%).

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.