Abstract (EN):
The kinetics for the direct synthesis of dimethyl carbonate was studied over CeO2 at high pressure conditions in a batch reactor. Langmuir-Hinshelwood and Eley-Rideal mechanisms were proposed and compared by the performance of the respective reaction rate expression in fitting to the experimental kinetic data. The reactions were held at different temperatures (378-408 K), CO2/methanol molar ratios (1.1-4.0) and pressures (15-20 MPa) in order to adjust the kinetic parameters. An activation energy of 106 kJ mol(-1), as well as the standard enthalpy and Gibbs energy of reaction (-20.10 and 31.50 kJ mol(-1)) were calculated from experiments. Furthermore, the changes in pressure revealed an effect on the kinetic constant, with an activation volume equal to -0.208 cm(3) mol(-1).
Idioma:
Inglês
Tipo (Avaliação Docente):
Científica
Nº de páginas:
8