Ti-modified Co3O4 catalysts with various Co/Ti ratios were synthesized using the co-precipitation method and were used in catalytic oxidation of dibromomethane (CH2Br2), which was selected as the model molecule for brominated volatile organic compounds (BVOCs). Addition of Ti distorted the crystal structure and led to the formation of a Co-O-Ti solid solution. Co4Ti1 (Co/Ti molar ratio was 4) achieved higher catalytic activity with a Tar (the temperature needed for 90% conversion) of approximately 245 degrees C for CH2Br2 oxidation and higher selectivity to CO2 at a low temperature than the other investigated catalysts. In addition, Co4Ti1 was stable for at least 30 hat 500 ppm CH2Br2, 0 or 2 vol% H2O, 0 or 500 ppm p-xylene (PX), and 10% O-2 at a gas hourly space velocity of 60,000 h(-1). The final products were COx, Br-2, and HBr, without the formation of other Br-containing organic byproducts. The high catalytic activity was attributed to the high Co3+/Co2+ ratio and high surface acidity. Additionally, the synergistic effect of Co and Ti made it superior for CH2Br2 oxidation. Furthermore, based on the analysis of products and in situ DRIFTs studies, a receivable reaction mechanism for CH2Br2 oxidation over Ti-modified Co3O4 catalysts was proposed. (C) 2017 Elsevier Inc. All rights reserved.