CO preferential oxidation reaction aspects in a nanocrystalline CuO/CeO2 catalyst

• Published in: Catalysis today 2020-03, Vol.344, p.124-128
• Main Authors: Reis, C.G.M., Almeida, K.A., Silva, T.F., Assaf, J.M.
• Format: Article
• Language: English
• Subjects: Cerium; CO-PROX; Copper; Pechini method; Real PRPOX
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2018.10.037

[Display omitted] •CuO/CeO2 catalysts with low copper were prepared by the Pechini method.•At low temperatures, the CuO/CeO2 system has high selectivity to CO-PROX reaction.•The catalysts activity depends on the CuO species dispersion on CeO2 support.•H2O/CO2 addition does not influence significantly in the reaction results.•The lower copper content favors the CO conversion and selectivity. CuO/CeO2 catalysts were prepared by the Pechini method and applied in the CO preferential oxidation (CO-PROX). The CuO content effects on the catalysts and the presence of H2O and CO2 in the reaction stream on the catalytic performance were investigated. The catalyst with 1.0 wt.% CuO presented the highest conversion and selectivity in the COPROX in the temperature range 100–250 °C. It was observed that the catalytic system is sensitive to the dispersion of the active phase and, independently of the copper content, the high activity of the CuO/CeO2 catalysts is closely related to the finely dispersed CuO species strongly interacting with CeO2 support. In the long-term stability test under the real CO-PROX condition with 10 mol% H2O and 15 mol% CO2 in the reactant stream, about 90% CO conversion can be maintained even at low temperature (150 °C) with 95% selectivity.