Chlorinated　volatile　organic　compounds　(CVOCs)　existing　widely　in　the　industries　are　harmful　to　the　environment　and　human＇s　health.　It　is　urgent　to　develop　highly　efficient　catalysts　for　their　combustion.　Herein,　a　series　of　porous　MnOx/Co3O4　nanocomposites　are　synthesized　by　the　pyrolysis　of　Mn@Co-ZIF-67　precursors,　in　which　the　Mn　ions　are　introduced　by　impregnation　method.　XRD,　Raman,　ICP-OES,　BET,　SEM,　TEM,　XPS,　O2-TPD,　and　H2-TPR　have　been　performed　to　investigate　the　as-prepared　catalysts’　physicochemical　properties.　The　optimal　catalyst　MnOx/Co3O4-4h　exhibits　90%　and　100%　chlorobenzene　(CB)　conversion　(1000　ppm,　Air,　WHSV　=　60,000　mL/(g　h))　at　334　°C　and　350　°C,　respectively.　And　the　better　catalytic　performance　over　MnOx/Co3O4-4h　compared　with　the　pure　Co3O4　and　other　MnOx/Co3O4　nanocomposites　mainly　ascribes　to　its　porous　structures,　homogeneous　dispersion,　optimal　Mn/Co　molar　ratio,　more　lattice　defects,　and　higher　surface　OLatt/OAds　ratio.　Meanwhile,　MnOx/Co3O4-4h　displays　high　stability　and　resistance　to　moisture.　Main　intermediates　have　been　further　investigated　by　in　situ　DRIFT,　and　the　degradation　mechanism　has　been　proposed　according　to　the　analysis　of　intermediates.　©　2021