Kinetic study of toluene partial oxidation to benzaldehyde, using a Ce – Zr – Mo mixed oxide as catalyst

Abstract. The kinetic study of Ce-Zr-Mo catalysts on toluene partial oxidation to benzaldehyde in vapor phase is presented in this work. Three different families of mixed oxides prepared by pseudo sol gel method were characterized. The effect of the synthesis method on the catalysts performance was evaluated by changing procedure steps and the interaction between the active phase and the support of the materials. For the modified pseudo sol gel method samples, the changes of structural properties evidence the predominant role of the Mo species on the catalyst surface promoting total oxidation. The synthesis effect was also evidenced on materials which exhibit ceramic structures, leading heterogeneous surface for deposited catalysts and dispersed grains for integrate catalysts. The theoretical composition proposed, as well as the synthesis methodology lead to solids, which exhibit multiple phases and polycrystallinity. The kinetic study was made for the most selective catalyst evaluated (Ce2.65Zr0.35Mo3O14). The mathematical regression fitting for Mars and Van Krevelen kinetic model present less relative error with respect to the experimental data, compared with three LHHW kinetic models and power law rate model evaluated.

• Autores: Díaz Chaparro, Geraldine
• Fecha de publicación: 2016
• Institución: Universidad Nacional de Colombia
• Repositorio: Universidad Nacional de Colombia
• Idioma: spa
• OAI Identifier: oai:repositorio.unal.edu.co:unal/59003
• Acceso en línea: https://repositorio.unal.edu.co/handle/unal/59003; http://bdigital.unal.edu.co/56147/
• Palabra clave: 53 Física / Physics; 62 Ingeniería y operaciones afines / Engineering; 66 Ingeniería química y Tecnologías relacionadas/ Chemical engineering; Mixed oxides; Catalysts; Toluene; Benzaldehyde; Kinetic study; Estudio cinético; Óxidos mixtos; Catalizadores; Tolueno; Benzaldehído
• Rights: openAccess
• License: Atribución-NoComercial 4.0 Internacional