In　contrast　to　previous　defect　engineering　methods,　the　preparation　of　amorphous　materials　can　obtain　abundant　defect　sites　through　a　simple　way,　which　is　expected　to　effectively　degrade　Volatile　Organic　Compounds　(VOCs)　under　milder　conditions.　However,　in-depth　and　systematic　studies　in　this　area　are　still　lacking.　Novel　types　of　amorphous　CeMn　x　catalysts　with　abundant　defects　were　prepared　through　simple　hydrothermal　synthesis　and　used　for　Cl-VOCs　catalysis　for　the　first　time.　Experimental　characterizations　and　DFT　calculations　proved　that　Ce　doping　induced　MnO2　lattice　distortion,　which　led　to　the　transformation　of　CeMn　x　into　an　amorphous　structure　and　the　formation　of　abundant　defect　sites.　It　was　observed　that　CeMn0.16　was　able　to　eliminate　chlorobenzene　(CB)　at　200　degrees　C,　and　the　CO(2　)yields　and　the　selectivity　of　inorganic　chlorine　was　significantly　higher　than　that　of　MnO2.　The　O-18　isotope　kinetic　experiments　revealed　that　the　interfacial　reaction　process　followed　the　MVK　mechanism.　The　large　number　of　oxygen　vacancies　accelerated　the　migration　of　lattice　oxygen　from　the　interior　to　the　exterior,　enhancing　the　ability　to　trap　gas-phase　oxygen.　Mn4+　acted　as　the　main　active　center　to　participate　in　CB　catalysis,　and　the　resulting　reactive　oxygen　species　(ROS)　and　Mn3+-[O2-]-Ce4+　further　accelerated　the　entire　oxidation　cycle.