“…5 The size of supported Au particles can affect their geometric structure/morphology and subsequently the number of low-coordinated Au atoms generally with enhanced catalytic activity. 5,9 However, it has been recognized that CO oxidation catalyzed by supported Au catalysts follows various reaction pathways involving different active sites and corresponding surface species/intermediates, 10 involving CeO 2 surfaces upon CO adsorption on Au/CeO 2 catalysts 15,16,27 and the facile oxidation of CO(a) adsorbed on Au surfaces by O 2 16,26,27 whereas TAP results demonstrated 4 the participation of carbonate, bicarbonate and formate species involving CeO 2 surfaces in CO oxidation. 5,9 However, it has been recognized that CO oxidation catalyzed by supported Au catalysts follows various reaction pathways involving different active sites and corresponding surface species/intermediates, 10 involving CeO 2 surfaces upon CO adsorption on Au/CeO 2 catalysts 15,16,27 and the facile oxidation of CO(a) adsorbed on Au surfaces by O 2 16,26,27 whereas TAP results demonstrated 4 the participation of carbonate, bicarbonate and formate species involving CeO 2 surfaces in CO oxidation.…”