Selective CO oxidation over monolithic AuMgO/Al2O3 catalysts

• Published in: Journal of chemical technology and biotechnology (1986) 2012-01, Vol.87 (1), p.58-64
• Main Authors: OZDEMIR, Seval, ILSEN ONSAN, Zeynep, YILDIRIM, Ramazan
• Format: Article
• Language: English
• Subjects: Applied sciences; Catalysis; Catalytic reactions; Chemical engineering; Chemistry; Energy; Energy. Thermal use of fuels; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; fuel cell; Fuel cells; General and physical chemistry; MgO; monolithic catalysts; promoted Au/Al2O3 catalyst; Reactors; selective CO oxidation; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
• ISSN: 0268-2575; 1097-4660
• DOI: 10.1002/jctb.2682

BACKGROUND: Selective CO oxidation was studied in a hydrogen‐rich environment over monolithic Au/MgO/Al2O3 catalysts at 50–150 °C. The wash‐coating of cordierite monoliths with colloidal Al2O3 was followed by wet impregnation of MgO; the subsequent deposition of Au was achieved using various methods. All catalysts were characterized using ICP and ESEM. RESULTS: Homogenous deposition‐precipitation was found to be the best Au loading method among those tested for monoliths. The CO conversion over 1%(w/w) Au/1.25%(w/w) MgO/Al2O3 was ca 80% at 90 °C. Increasing the Au content of the catalyst from 0.16 to 1.0%(w/w) increased CO conversion and shifted the required temperature to lower values. A similar trend was also observed for maximum CO conversion at increasing W/FCO ratios. The addition of MgO was beneficial for CO conversion. CONCLUSION: Although CO conversion of ca 80% was lower than that achieved with particulate catalysts, it is high enough as a starting point for further improvement considering the superiority of monolithic supports for practical applications. Copyright © 2011 Society of Chemical Industry