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Improved CO-PROX Performance of CuO/CeO2 Catalysts by Using Nanometric Ceria as Support

1
Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, University of Naples Federico II, P.le Tecchio 80, 80125 Naples, Italy
2
Institute of Researches on Combustion-CNR, P.le Tecchio 80, 80125 Naples, Italy
*
Author to whom correspondence should be addressed.
Catalysts 2018, 8(5), 209; https://doi.org/10.3390/catal8050209
Received: 24 April 2018 / Revised: 11 May 2018 / Accepted: 11 May 2018 / Published: 15 May 2018
(This article belongs to the Special Issue Catalysts for Hydrogen Purification for Fuel Cell Applications)
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Abstract

Despite of the huge number of papers about the catalytic preferential oxidation of CO (CO-PROX) for the purification of H2 streams, there is still a need for more effective catalysts in order to reduce the large required catalyst volume of CO-PROX unity. In this work, large surface area nanometric ceria was used as support for CuO/CeO2 catalysts with CuO load up to 10 wt % easily dispersed by wet impregnation. Catalysts were characterized by ICP-MS, XRD, SEM/EDS, N2 physisorption, H2 temperature programmed reduction (TPR), and CO2 temperature programmed desorption (TPD) and tested under different reaction conditions (including under feed containing inhibiting species such as CO2 and H2O). Catalytic tests revealed that our samples show high activity and selectivity even under stringent reaction conditions; moreover, they result among the most active catalysts when compared to those reported in the scientific literature. The high activity can be related to the enhanced amount of highly dispersed copper sites in strong interaction with ceria related to the nature of the nanometric support, as evidenced by the characterization techniques. Despite the high concentration of active copper sites, catalytic performance is limited by CO2 desorption from ceria in the neighborhood of copper sites, which prevents a further improvement. This suggests that new catalyst formulations should also provide a lower affinity towards CO2. View Full-Text
Keywords: CO-PROX; hydrogen; CuO/CeO2; nanoparticles CO-PROX; hydrogen; CuO/CeO2; nanoparticles
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Di Benedetto, A.; Landi, G.; Lisi, L. Improved CO-PROX Performance of CuO/CeO2 Catalysts by Using Nanometric Ceria as Support. Catalysts 2018, 8, 209.

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