Selective CO oxidation over monolithic Au-MgO/Al 2O 3 catalysts
Journal of Chemical Technology and Biotechnology, cilt.87, sa.1, ss.58-64, 2012 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 87 Sayı: 1
- Basım Tarihi: 2012
- Doi Numarası: 10.1002/jctb.2682
- Dergi Adı: Journal of Chemical Technology and Biotechnology
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.58-64
- Anahtar Kelimeler: Fuel cell, MgO, Monolithic catalysts, Promoted Au/Al 2O 3 catalyst, Selective CO oxidation
- Boğaziçi Üniversitesi Adresli: Evet
Özet
Background: Selective CO oxidation was studied in a hydrogen-rich environment over monolithic Au/MgO/Al 2O 3 catalysts at 50-150 °C. The wash-coating of cordierite monoliths with colloidal Al 2O 3 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/Al 2O 3 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/F CO 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. © 2011 Society of Chemical Industry.