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Copper-based catalysts supported on highly porous silica for the Water Gas Shift reaction

Marras, C, Loche, D, Carta, Daniela, Casula, MF, Schirru, M, Cutrufello, G and Corrias, A (2016) Copper-based catalysts supported on highly porous silica for the Water Gas Shift reaction ChemPlusChem, 81 (4). pp. 421-432.

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Copper-based nanoparticles, supported on either a silica aerogel or cubic mesostructured silicas obtained by using two different synthetic protocols, were used as catalysts for the water gas shift reaction. The obtained nanocomposites were thoroughly characterised before and after catalysis through nitrogen adsorption–desorption measurements at −196 °C, TEM, and wide- and low-angle XRD. The samples before catalysis contained nanoparticles of copper oxides (either CuO or Cu2O), whereas the formation of metallic copper nanoparticles, constituting the active catalytic phase, was observed either by using pre-treatment in a reducing atmosphere or directly during the catalytic reaction owing to the presence of carbon monoxide. A key role in determining the catalytic performances of the samples is played by the ability of different matrices to promote a high dispersion of copper metal nanoparticles. The best catalytic performances are obtained with the aerogel sample, which also exhibits constant carbon monoxide conversion values at constant temperature and reproducible behaviour after subsequent catalytic runs. On the other hand, in the catalysts based on cubic mesostructured silica, the detrimental effects related to sintering of copper nanoparticles are avoided only on the silica support, which is able to produce a reasonable dispersion of the copper nanophase.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemistry
Authors :
Marras, C
Loche, D
Casula, MF
Schirru, M
Cutrufello, G
Corrias, A
Date : 2 February 2016
DOI : 10.1002/cplu.201500395
Uncontrolled Keywords : copper; mesoporous materials; silica; supported catalysts; water gas shift reaction
Depositing User : Jane Hindle
Date Deposited : 29 Aug 2017 12:46
Last Modified : 24 Aug 2018 08:12

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