Various unpromoted and alkali (earth) promoted gold catalysts were characterized by means of XRD, HRTEM, DR/UV–Vis and TPR. Based on the results we conclude that metallic Au is the active species in CO oxidation and that the reduction of Au3+ to Au0 proceeds below 200 °C. Pretreatment at mild temperatures, viz. 200 °C, results in the highest catalytic performance of Au/Al2O3 in low-temperature CO oxidation. Alkali (earth) metal oxide additives are most probably structural promoters. The best promoting effect is found for BaO.
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Gluhoi, A.C., Tang, X., Marginean, P. et al. Characterization and catalytic activity of unpromoted and alkali (earth)-promoted Au/Al2O3 catalysts for low-temperature CO oxidation. Top Catal 39, 101–110 (2006). https://doi.org/10.1007/s11244-006-0043-4
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DOI: https://doi.org/10.1007/s11244-006-0043-4