Synergistic effect between Mn and Ce for active and stable catalytic wet air oxidation of phenol over MnCeOx

被引：48
|
作者：
Geng, Lili [1 ,2 ]
Chen, Bingbing [1 ,2 ]
Yang, Jihao [1 ,2 ]
Shui, Cailing [1 ,2 ]
Ye, Songshou [1 ,2 ]
Fu, Jile [1 ,2 ,3 ]
Zhang, Nuowei [1 ,2 ]
Xie, Jianrong [1 ,2 ]
Chen, Binghui [1 ,2 ]
机构：
[1] Xiamen Univ, Coll Chem & Chem Engn, Dept Chem & Biochem Engn, Natl Engn Lab Green Prod Alcohols Ethers Esters, Xiamen 361005, Peoples R China
[2] Xiamen Univ Malaysia, Sch Energy & Chem Engn, Jalan Sunsuria, Bandar Sunsuria 43900, Sepang, Malaysia
[3] Western Univ, Dept Chem & Biochem Engn, London, ON N6A 5B9, Canada
来源：
APPLIED CATALYSIS A-GENERAL | 2020年 / 604卷
关键词：
Catalytic wet air oxidation; MnCeO(x)catalyst; Oxygen activation; Oxygen transfer; Phenol degradation; BIRNESSITE-TYPE MNO2; FORMALDEHYDE OXIDATION; TOLUENE; COMBUSTION; ABATEMENT; HOLLOW; VOCS;
D O I：
10.1016/j.apcata.2020.117774
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A series of MnCeOx catalysts for the catalytic wet air oxidation (CWAO) of phenol is developed by a redoxprecipitation preparation method. Among them, Mn9Ce1Ox (Mn/Ce= 9:1) shows excellent activity and stability which can achieve TOC conversion of 88.1 % in 60 min at 70 degrees C and retain stable for five consecutive runs. Even at 50 degrees C, Mn9Ce1Ox can reach a phenol conversion of 84. 2% and a TOC conversion of 73.8 %. The roles of Mn valence state and Ce modification in the catalytic performance of Mn9Ce1Ox are extensively investigated by XRD, BET, Raman, H-2-TPR and XPS. It is found that high Mn4+ concentration favors phenol adsorption and oxidation while high Mn3+ concentration favors oxygen activation. Ce optimizes the Mn4+/Mn3+ ratio and thus enhances catalytic activity. Additionally, Ce retains the structure of the catalyst and prevents Mn4+ and Mn3+ from being reduced to Mn2+, which contributes the good stability.
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页数：10
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