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.

引用

页数：10

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