The catalytic combustion of methylenechloride, carbontetrachloride, and chloroform, three of the chloromethanes, was investigated on metal oxide catalysts prepared on the monolith support or on the spherical alumina pellets. The prepared catalysts were tested for methylenechloride and carbontetrachloride at the different temperatures and at varying GHSV values with an excess air ratios of 216% and 3100%, respectively. The catalyst having the composition of 15% Cr2O3, 5% Ce2O3 and 80% gamma-Al2O3 on the monolith was found to be ultimate due to the complete destruction of methylenechloride and to the highest mechanical stability. The operating conditions were proposed as 77778 h(-1) for the GHSV, 216% for the excess air and 400-500degreesC for the temperature range to combust methylenechloride completely. However the catalyst with a different active part composition (18% Cr2O3, 2% Ce2O3) satisfied nearly complete destruction of carbontetrachloride. The operating conditions were 5702 h(-1) for the GHSV, 3100% for the excess air ratio and 800degreesC for the temperature to combust carbontetrachloride. The catalytic oxidation of chloroform was investigated by the catalyst having the composition of 18% Cr2O3, 2% of Ce2O3 on monolith. The excess air was kept at a value of 4077%. The reactor temperature was changed between 200 and 300degreesC.