完全氧化和部分氧化反应中CuMnO<i><sub>x</sub></i>的不同活性相

doi:10.11896/cldb.19040087

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Abstract The target products of total oxidation and partial oxidation are completely different. CuMnO_x 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. CuMnO_x 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. CuO_x and MnO_x species with different valence states as well as spinel phase or amorphous Cu-Mn mixed oxide can be found in CuMnO_x. 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 CuMnO_x.
In the partial oxidation reactions of alcohols, the active phase of CuMnO_x 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 MnO_x or CuO_x were found to be active in the total oxidation reactions. In such a mixture, MnO_x species can provide sufficient molecular oxygen for the spinel species due to their high storage-release capacity of oxygen species while highly dispersed CuO_x species can activate molecular oxygen.
Herein, a summary of the active phases of CuMnO_x in both the partial oxidation of alcohols and the total oxidation of VOCs was taken. An introduction to spinel Cu_xMn_3-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 Cu_xMn_3-xO₄ species, the mixtures of spinel Cu_xMn_3-xO₄ species and copper oxide or manganese oxide compounds in total oxidation were discussed, respectively.

Key words： CuMnO_x active phase partial oxidation total oxidation

Published: 27 April 2020

CLC number:

O643

Fund:This work was financially supported by the National Natural Science Foundation of China (U1362105,21606028), Chongqing Science & Technology Commission Research Projects (cstc2017jcyjAX0192,cstc2017jcyjAX0209,cstc2018jcyjAX0638), Research Project of the Key Laboratory of Catalysis Science and Technology, Chongqing Education Commission (CQCM-2017-05).

About author:: Yuantao Tang graduated from Panzhihua University and became a postgraduate student in Chongqing Technology and Business University,majoring in heteroge-neous catalysis and nano sized functional materials.
Haidong Zhang received his Ph.D. degree in 2005 in Dalian Institute of Chemical Physics. He was offered a position in Chongqing Technology & Business University in 2007 and then do research in environmental catalysis and heterogeneous/homogeneous catalysis.

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	TANG Yuantao
	ZHANG Haidong
	CHEN Jia
	SHEN Yu
	XIONG Kun
	ZHOU Yufeng
	LI Xiaojie
	HU Yueyue

Cite this article:

TANG Yuantao,ZHANG Haidong,CHEN Jia, et al. Different Active Phases of CuMnO_x for Total Oxidation and Partial Oxidation[J]. Materials Reports, 2020, 34(9): 9028-9033.

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http://www.mater-rep.com/EN/10.11896/cldb.19040087 OR http://www.mater-rep.com/EN/Y2020/V34/I9/9028

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