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Synthesis, Characterization, and Use of Nb V /Ce IV ‐Mixed Oxides in the Direct Carboxylation of Ethanol by using Pervaporation Membranes for Water Removal
Author(s) -
Dibenedetto Angela,
Aresta Michele,
Angelini Antonella,
Ethiraj Jayashree,
Aresta Brunella Maria
Publication year - 2012
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201201561
Subject(s) - pervaporation , carboxylation , catalysis , membrane , ethanol , supercritical fluid , chemistry , chemical engineering , phase (matter) , nuclear chemistry , inorganic chemistry , materials science , organic chemistry , permeation , biochemistry , engineering
New catalytic systems based on ceria have been used in the direct carboxylation of ethanol. The catalytic behavior of Al 2 O 3 and Nb 2 O 5 loaded ceria is compared, the latter showing a better performance. A morphological and structural study has been carried out on Nb 2 O 5 /CeO 2 catalysts in order to explain their behavior 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 CO 2 or in supercritical conditions. A set‐up has been developed that allows the production of quite pure DEC (>90 %) with recycling of CO 2 and ethanol.