The　chemical　state　of　Pd　plays　an　important　role　in　the　catalytic　combustion　of　volatile　organic　compounds　(VOCs).　In　this　work,　we　adopted　a　novel　one-step　modified　KIT-6-templating　strategy　with　nitrates　of　cobalt　and　palladium　as　the　metal　source　to　successfully　synthesize　the　three-dimensionally　ordered　mesoporous　Co3O4-supported　Pd　nanoparticles　(0.85　wt%　Pd/meso-Co3O4,　denoted　as　0.85Pd/meso-Co3O4).　The　0.93　wt%　Pd/meso-CoO　(denoted　as　0.93Pd/meso-CoO)　and　1.08　wt%　Pd/meso-Co-CoO　(denoted　as　1.08Pd/meso-Co-CoO)　samples　were　prepared　via　in　situ　reduction　of　0.85Pd/meso-Co3O4　in　a　H-2　flow　at　200　and　350　degrees　C,　respectively.　Among　these　samples,　0.93Pd/meso-CoO　exhibited　the　highest　catalytic　activity　for　benzene　combustion　(T-50%　=　167　degrees　C　and　T-90%　=　189　degrees　C　at　a　space　velocity　of　40000　mL　(g　h)(-1)).　The　chemical　state　of　Pd　on　the　0.93Pd/meso-CoO　surface　was　metallic　Pd-0,　which　favored　oxygen　activation　to　active　adsorbed　oxygen　(O-ads)　species,　hence　rendering　this　sample　to　possess　the　largest　desorption　of　O-ads　species　below　400　degrees　C.　The　intermediates　of　formate,　acetate,　maleate,　and　phenolate　were　generated　via　the　interaction　of　benzene　and　O-ads　species.　We　conclude　that　the　excellent　catalytic　performance　of　0.93Pd/meso-CoO　was　related　to　the　mainly　formed　Pd-0　species,　good　oxygen　activation　ability,　and　high　surface　area.