Active Coordinatively Unsaturated Manganese Monoxide-Containing Mesoporous Carbon Catalyst in Wet Peroxide Oxidation
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- 作者：Lina Kong ; Wei Wei ; Qingfei Zhao ; Jian-Qiang Wang ; Ying Wan
- 刊名：ACS Catalysis
- 出版年：2012
- 出版时间：December 7, 2012
- 年：2012
- 卷：2
- 期：12
- 页码：2577-2586
- 全文大小：427K
- 年卷期：v.2,no.12(December 7, 2012)
- ISSN：2155-5435
文摘
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), N2 sorption, and transmission electron microscopy results reveal that the catalysts have the ordered two-dimensional hexagonal mesostructure, large surface areas (530鈥?52 m2/g), uniform pore sizes (3.3鈥?.4 nm), and large pore volumes (0.34鈥?.44 cm3/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.