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J Colloid Interface Sci

Title:		"Catalytic oxidation of dibromomethane over Ti-modified Co(3)O(4) catalysts: Structure, activity and mechanism"
Author(s):		Mei J; Huang W; Qu Z; Hu X; Yan N;
Address:		"School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai 200240, PR China. School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai 200240, PR China. Electronic address: nqyan@sjtu.edu.cn"
Journal Title:		J Colloid Interface Sci
Year:		2017
Volume:		20170623
Issue:
Page Number:		870 - 883
DOI:		10.1016/j.jcis.2017.06.077
ISSN/ISBN:		1095-7103 (Electronic) 0021-9797 (Linking)
Abstract:		"Ti-modified Co(3)O(4) catalysts with various Co/Ti ratios were synthesized using the co-precipitation method and were used in catalytic oxidation of dibromomethane (CH(2)Br(2)), 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. Co(4)Ti(1) (Co/Ti molar ratio was 4) achieved higher catalytic activity with a T(90) (the temperature needed for 90% conversion) of approximately 245 degrees C for CH(2)Br(2) oxidation and higher selectivity to CO(2) at a low temperature than the other investigated catalysts. In addition, Co(4)Ti(1) was stable for at least 30h at 500ppm CH(2)Br(2), 0 or 2vol% H(2)O, 0 or 500ppm p-xylene (PX), and 10% O(2) at a gas hourly space velocity of 60,000h(-1). The final products were CO(x), Br(2), and HBr, without the formation of other Br-containing organic byproducts. The high catalytic activity was attributed to the high Co(3+)/Co(2+) ratio and high surface acidity. Additionally, the synergistic effect of Co and Ti made it superior for CH(2)Br(2) oxidation. Furthermore, based on the analysis of products and in situ DRIFTs studies, a receivable reaction mechanism for CH(2)Br(2) oxidation over Ti-modified Co(3)O(4) catalysts was proposed"
Keywords:		Catalytic oxidation Cobalt Dibromomethane (CH(2)Br(2)) Titania;
Notes:		"PubMed-not-MEDLINEMei, Jian Huang, Wenjun Qu, Zan Hu, Xiaofang Yan, Naiqiang eng 2017/07/04 J Colloid Interface Sci. 2017 Nov 1; 505:870-883. doi: 10.1016/j.jcis.2017.06.077. Epub 2017 Jun 23"