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Article

CO Total and Preferential Oxidation over Stable Au/TiO2 Catalysts Derived from Preformed Au Nanoparticles

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Institute of Energy Technologies, Department of Chemical Engineering and Barcelona Research Centre in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, Campus EEBE, Eduard Maristany 10-14, 08019 Barcelona, Spain
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Planta Piloto de Ingeniería Química, PLAPIQUI (UNS-CONICET), Camino la Carrindanga Km 7, 8000 Bahía Blanca, Argentina
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Department of Inorganic and Organic Chemistry, Inorganic Chemistry Section, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain
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Fraunhofer Institute of Microengineering and Microsystems, Carl-Zeiss-Str. 18-20, D-55129 Mainz, Germany
*
Authors to whom correspondence should be addressed.
Catalysts 2020, 10(9), 1028; https://doi.org/10.3390/catal10091028
Received: 29 July 2020 / Revised: 20 August 2020 / Accepted: 1 September 2020 / Published: 7 September 2020
(This article belongs to the Special Issue Catalytic CO Oxidation and Preferential CO Oxidation (PROX))
CO preferential oxidation (PROX) is an effective method to clean reformate H2 streams to feed low-temperature fuel cells. In this work, the PROX and CO oxidation reactions were studied on preformed Au nanoparticles (NPs) supported on TiO2 anatase. Preformed Au NPs were obtained from gold cores stabilized by dodecanethiols or trimethylsilane-dendrons. A well-controlled size of ca. 2.6 nm and narrow size distributions were achieved by this procedure. The catalysts were characterized by high-resolution transmission electron microscopy and ex situ and in situ X-ray photoelectron spectroscopy (XPS). The XPS results showed that the preformed Au NPs exhibited high thermal stability. The different ligand-derived Au catalysts, as well as a conventional gold catalyst for comparison purposes, were loaded onto cordierite supports with 400 cells per square inch. The activity and selectivity of the samples were evaluated for various operation conditions. The catalyst prepared using dodecanethiol-capped Au NPs showed the best performance. In fact, CO conversions of up to 70% at 40% CO2 selectivity and 90% O2 conversion were observed operating at 363 K in H2-rich atmospheres. The performance of the best catalysts was subsequently tested on stainless steel microreactors. A 500-hour stability test was carried out under a real post-reformate stream, including 18 vol.% CO2 and 29 vol.% H2O. A mean CO conversion of ca. 24% was measured for the whole test operating at 453 K and a gas hourly space velocity (GHSV) of 1.3 × 104 h−1. These results reveal our dodecanethiol- and carbosilane-derived Au catalysts as extremely promising candidates to conduct a PROX reaction while avoiding deactivation, which is one of the major drawbacks of Au/TiO2 catalysts. View Full-Text
Keywords: preformed Au nanoparticles; dendrons; dendrimers; thiols; CO oxidation; PROX; CO-PrOx; microreactor; fuel reformer; stability test preformed Au nanoparticles; dendrons; dendrimers; thiols; CO oxidation; PROX; CO-PrOx; microreactor; fuel reformer; stability test
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MDPI and ACS Style

Divins, N.J.; López, E.; Angurell, I.; Neuberg, S.; Zapf, R.; Kolb, G.; Llorca, J. CO Total and Preferential Oxidation over Stable Au/TiO2 Catalysts Derived from Preformed Au Nanoparticles. Catalysts 2020, 10, 1028. https://doi.org/10.3390/catal10091028

AMA Style

Divins NJ, López E, Angurell I, Neuberg S, Zapf R, Kolb G, Llorca J. CO Total and Preferential Oxidation over Stable Au/TiO2 Catalysts Derived from Preformed Au Nanoparticles. Catalysts. 2020; 10(9):1028. https://doi.org/10.3390/catal10091028

Chicago/Turabian Style

Divins, Núria J., Eduardo López, Inmaculada Angurell, Stefan Neuberg, Ralf Zapf, Gunther Kolb, and Jordi Llorca. 2020. "CO Total and Preferential Oxidation over Stable Au/TiO2 Catalysts Derived from Preformed Au Nanoparticles" Catalysts 10, no. 9: 1028. https://doi.org/10.3390/catal10091028

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