Kinetic study of the conversion of 2-methoxyphenol over supported Re catalysts: Sulfide and oxide state

LEIVA, K.; SEPÚLVEDA, C.; LAURENTI, D.; VRINAT, M.; GEANTET, C.; ESCALONA, N.
Applied Catalysis A: General 505 (2015) 302-308.

DOI: 10.1016/j.apcata.2015.08.010

Abstract

The kinetics of guaiacol conversion over ReS₂/SiO₂ and ReOx/SiO₂ catalysts in a batch reactor at 300 °C and 5 MPa hydrogen pressure was studied. The ReOx/SiO₂ catalyst was more active and selective towards deoxygenated products (mainly cyclohexane), while the ReS₂/SiO₂ catalyst was more selective towards the formation of phenol. Langmuir–Hinshelwood kinetic models were developed in order to identify changes in the reaction mechanism with the ReOx/SiO₂ and ReS₂/SiO₂ catalysts. The results for the guaiacol conversion over ReS₂/SiO₂ catalyst were fitted to a model that assumes the presence of two different kinds of active sites and that hydrogen adsorption is generated through heterolytic dissociation. The conversion of guaiacol over the ReOx/SiO₂ catalyst was fitted to a model that assumes hydrogen adsorption via homolytic dissociation and a single catalytic site.