Different Active Phases of CuMnOx for Total Oxidation and Partial Oxidation
TANG Yuantao1,2, ZHANG Haidong1,2,3, CHEN Jia1,2, SHEN Yu2,3, XIONG Kun1,2, ZHOU Yufeng1,2, LI Xiaojie1,2, HU Yueyue1,2
1 Research Center for Waste Oil Recovery Technology and Equipment of Ministry of Education of the People’s Republic of China,Chongqing 400067, China 2 Chongqing Key Laboratory of Catalysis and New Environmental Materials, Key Laboratory of Catalysis Science and Technology of Chongqing Education Commission,Chongqing 400067, China 3 National Research Base of Intelligent Manufacturing Service, Chongqing Technology and Business University, Chongqing 400067, China
Abstract: The target products of total oxidation and partial oxidation are completely different. CuMnOx can catalyze total oxidation and partial oxidation reactions like the catalytic combustion of volatile organic compounds (VOCs) and the partial oxidation of alcohols to aldehydes and ketones. CuMnOx have very complex structure which is highly sensitive to their preparation strategies. Such a high sensitivity implies that a tiny change of preparation method can lead to significant differences in catalyst structure. CuOx and MnOx species with different valence states as well as spinel phase or amorphous Cu-Mn mixed oxide can be found in CuMnOx. These species are all active in either total oxidation or partial oxidation. Howe-ver, researchers have not achieved a consensus for the active phase of CuMnOx. In the partial oxidation reactions of alcohols, the active phase of CuMnOx is spinel Cu-Mn mixed oxide, which can provide a variety of active oxygen species, movable surface adsorbed oxygen species, surface oxygen vacancy and lattice oxygen species. In the total oxidation reactions of VOCs, the spinel Cu-Mn mixed oxide with high content of Mn4+, which can adsorb reactants, present high redox performance and therefore exhibit high catalytic activity. The amorphous Cu-Mn-O species with abundant Mn3+ is also highly active due to the reaction (Cu2++Mn3+→Cu++Mn4+) carrying on catalyst surface. The mixtures of spinel and MnOx or CuOx were found to be active in the total oxidation reactions. In such a mixture, MnOx species can provide sufficient molecular oxygen for the spinel species due to their high storage-release capacity of oxygen species while highly dispersed CuOx species can activate molecular oxygen. Herein, a summary of the active phases of CuMnOx in both the partial oxidation of alcohols and the total oxidation of VOCs was taken. An introduction to spinel CuxMn3-xO4 species as the active phase of the partial oxidation of alcohols and the analyzing of the partial oxidation reaction mechanism on these species were demonstrated. In order to offer an useful clue to the development of highly effective catalysts for partial oxidation and total oxidation, the roles of amorphous Cu-Mn-O species, spinel CuxMn3-xO4 species, the mixtures of spinel CuxMn3-xO4 species and copper oxide or manganese oxide compounds in total oxidation were discussed, respectively.
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2020, Vol. 34 
