Three-dimensionally　(3D)　ordered　mesoporous　beta-MnO2-supported　Au　nanocatalysts　(Au/beta-MnO2(urea),　Au/beta-MnO2(NaOH),　and　Au/beta-MnO2(Na2CO3))　with　an　Au　loading　of　5　wt.%　were　prepared　by　the　deposition-precipitation　method　using　urea,　NaOH　and　Na2CO3　as　precipitating　agent,　respectively.　The　physicochemical　properties　of　the　materials　were　characterized　by　means　of　numerous　analytical　techniques,　and　their　catalytic　activities　were　evaluated　for　the　complete　oxidation　of　CO,　benzene,　and　toluene.　It　is　shown　that　the　nature　of　precipitating　agent　had　an　important　influence　on　the　physicochemical　properties　of　the　beta-MnO2　support,　Au　nanoparticles,　and　Au/beta-MnO2　catalysts.　Among　the　three　Au/beta-MnO2　samples,　the　Au/beta-MnO2(NaOH)　showed　the　highest　surface　atomic　ratios　of　Mn3+/Mn4+,　O-ads/O-latt,　and　Au3+/Au-0.　The　loading　of　gold　could　greatly　modify　the　reducibility　of　Au/beta-MnO2　via　the　strong　interaction　between　the　gold　and　the　beta-MnO2　support,　and　the　Au/beta-MnO2(NaOH)　sample　possessed　the　best　low-temperature　reducibility.　Gold　loading　resulted　in　a　significant　enhancement　in　catalytic　activity　of　beta-MnO2.　The　three　Au/beta-MnO2　catalysts　outperformed　the　Au-free　beta-MnO2　catalyst,　among　which　the　Au/beta-MnO2(NaOH)　one　showed　the　best　catalytic　activity　(T-50%　and　T-100%　=　48　and　70　degrees　C　for　CO　oxidation,　200　and　250　degrees　C　for　benzene　oxidation,　and　170　and　220　degrees　C　for　toluene　oxidation,　respectively).　It　is　concluded　that　factors,　such　as　the　better　gold　dispersion,　higher　surface　Au3+　and　oxygen　adspecies　concentrations,　better　low-temperature　reducibility,　stronger　synergistic　action　between　the　gold　and　the　support　as　well　as　the　high-quality　3D　ordered　mesoporous　structure　of　the　support,　might　be　responsible　for　the　excellent　catalytic　performance　of　Au/beta-MnO2(NaOH).　(C)　2013　Elsevier　Inc.　All　rights　reserved.