New catalytic systems based on ceria have been used in the direct carboxylation of ethanol. The catalytic behaviour of Al2O3 or Nb2O5 loaded ceria are compared, the latter showing a better performance. A morphological and structural study has been carried out on Nb2O5/CeO2 catalysts in order to explain their behaviour in catalysis. Pervaporation membranes have been used for water separation. The synthesis of diethylcarbonate-DEC has been carried out either in a liquid phase (ethanol) pressurized with CO2 or in supercritical conditions. A set-up has been developed that allows the production of quite pure DEC (>90%) with recycling of CO2 and ethanol.
Synthesis, characterization and use of Nb(V)/Ce(IV)-mixed oxides in the direct carboxylation of ethanol by using pervaporation membranes for water removal.
DIBENEDETTO, Angela;
2012-01-01
Abstract
New catalytic systems based on ceria have been used in the direct carboxylation of ethanol. The catalytic behaviour of Al2O3 or Nb2O5 loaded ceria are compared, the latter showing a better performance. A morphological and structural study has been carried out on Nb2O5/CeO2 catalysts in order to explain their behaviour in catalysis. Pervaporation membranes have been used for water separation. The synthesis of diethylcarbonate-DEC has been carried out either in a liquid phase (ethanol) pressurized with CO2 or in supercritical conditions. A set-up has been developed that allows the production of quite pure DEC (>90%) with recycling of CO2 and ethanol.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
