Synthesis and characterization of ceria-supported catalysts for carbon dioxide transformation to diethyl carbonate
Leino, Ewelina; Kumar, Narendra; Mäki-Arvela, Päivi; Rautio, Anne-Riikka; Dahl, Johnny; Roine, Jorma; Mikkola, Jyri-Pekka (2018-05-15)
Ewelina Leino, Narendra Kumar, Päivi Mäki-Arvela, Anne-Riikka Rautio, Johnny Dahl, Jorma Roine, Jyri-Pekka Mikkola, Synthesis and characterization of ceria-supported catalysts for carbon dioxide transformation to diethyl carbonate, Catalysis Today, Volume 306, 2018, Pages 128-137, ISSN 0920-5861, https://doi.org/10.1016/j.cattod.2017.01.016
© 2017 Elsevier B.V. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
The support materials Al₂O₃, SiO₂ and TiO₂ were modified with 16 wt% CeO₂, using two different preparation methods evaporation-impregnation and precipitation-deposition. The synthesized 16 wt% CeO₂-Al₂O₃, 16 wt% CeO₂-SiO₂ and 16 wt% CeO₂-TiO₂ materials were characterized by means of X-ray powder diffraction for the phase purity, scanning electron microscopy for the morphology, nitrogen physisorption to determine the specific surface area and X-ray photo electron spectroscopy for the oxidation state of the Ce in the TiO₂, Al₂O₃ and SiO₂ matrices. Transmission electron microscopy was used to study the particle size of CeO₂ whereas CO₂-temperature programmed desorption (TPD) was used to determine the basicity of ceria-modified TiO₂, Al₂O₃ and SiO₂ catalysts. Furthermore, the catalytic performance of the as prepared CeO₂-modified catalysts were compared in the synthesis of diethyl carbonate starting from ethanol and CO₂ using butylene oxide as the dehydrating agent. The physico-chemical characterization results were correlated with the catalytic activity results and discussed in detail.
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