Mesoporous　Co3O4　(meso-Co3O4)-supported　Pt　(0.53　wt.%　Pt/meso-Co3O4)　was　synthesized　via　the　KIT-6-templating　and　polyvinyl　alcohol　(PVA)-assisted　reduction　routes.　Mesoporous　CoO　(meso-CoO)　was　fabricated　through　in　situ　reduction　of　meso-Co3O4　with　glycerol,　and　the　0.18-0.69　wt.%　Pt/meso-CoO　samples　were　generated　by　the　PVA-assisted　reduction　method.　Meso-Co3O4　and　meso-CoO　were　of　cubic　crystal　structure　and　the　Pt　nanoparticles　(NPs)　with　a　uniform　size　of　ca.　2　nm　were　well　distributed　on　the　meso-Co3O4　or　meso-CoO　surface.　The　0.56　wt%　Pt/meso-CoO　(0.56Pt/meso-CoO)　sample　performed　the　best　in　benzene　combustion　(T-50%　=　156　degrees　C　and　T-90%　=　186　degrees　C　at　a　space　velocity　of　80,000　mL/(g　h)).　Introducing　water　vapor　or　CO2　with　a　certain　concentration　led　to　partial　deactivation　of　0.56　Pt/meso-CoO　and　such　a　deactivation　was　reversible.　We　think　that　the　superior　catalytic　activity　of　0.56　Pt/meso-CoO　was　intimately　related　to　its　good　oxygen　activation　and　benzene　adsorption　ability.　(C)　2019　The　Research　Center　for　Eco-Environmental　Sciences,　Chinese　Academy　of　Sciences.　Published　by　Elsevier　B.V.