Active Coordinatively Unsaturated Manganese Monoxide-Containing Mesoporous Carbon Catalyst in Wet Peroxide Oxidation

被引:55
作者
Kong, Lina [1 ,2 ]
Wei, Wei [1 ,2 ]
Zhao, Qingfei [1 ,2 ]
Wang, Jian-Qiang [3 ]
Wan, Ying [1 ,2 ]
机构
[1] Shanghai Normal Univ, Shanghai Key Lab Rare Earth Funct Mat, Minist Educ, Key Lab Resource Chem, Shanghai 200234, Peoples R China
[2] Shanghai Normal Univ, Dept Chem, Shanghai 200234, Peoples R China
[3] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China
来源
ACS CATALYSIS | 2012年 / 2卷 / 12期
基金
美国国家科学基金会;
关键词
manganese monoxide; carbon; mesostructure; coordinative unsaturation; confinement; oxidation; SIZE-SELECTIVE SYNTHESIS; HETEROGENEOUS CATALYSIS; HYDROGEN-PEROXIDE; PHENOL; SILICA; NANOPARTICLES; IRON; CRYSTALLINE; COMPOSITES; MESOPHASES;
D O I
10.1021/cs300534y
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 novel heterogeneous coordinatively unsaturated manganese monoxide-containing mesoporous carbon catalyst (C-MnO) is reported here. The catalysts exhibit high catalytic activity in wet oxidation of phenol (almost complete mineralization with an initial concentration of 50 mg/L at atmospheric pressure) and stability (reused 20 times without obvious activity loss or metal leaching), and they take more advantages than most developed heterogeneous Fenton catalysts. The one-pot surfactant self-assembly approach is used for the synthesis of the mesoporous C-MnO catalysts. Small-angle X-ray diffraction (XRD), N-2 sorption, and transmission electron microscopy results reveal that the catalysts have the ordered two-dimensional hexagonal mesostructure, large surface areas (530-552 m(2)/g), uniform pore sizes (3.3-5.4 nm), and large pore volumes (0.34-0.44 cm(3)/g); MnO nanoparticles (<12 nm) are well dispersed inside carbon mesopore systems with high crystallinity. The wide-angle XRD pattern reveals the presence of cubic rock salt structure MnO, and the Mn K-edge X-ray absorption fine structure spectra confirms the low chemical valence and the coordination unsaturated state of Mn. The high activity and stability of C-MnO catalysts might be related to the mesostructure, carbon pore wall, and, more importantly, the confined undercoordinative MnO nanoparticles.
引用
收藏
页码:2577 / 2586
页数:10
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