Stability of carbon-supported iron catalysts for catalytic wet peroxide oxidation of ionic liquids

被引:11
作者
Mena, Ismael F. [1 ]
Diaz, Elena [1 ]
Moreno-Andrade, Ivan [2 ]
Rodriguez, Juan J. [1 ]
Mohedano, Angel F. [1 ]
机构
[1] Univ Autonoma Madrid, Dept Ingn Quim, Campus Cantoblanco, E-28049 Madrid, Spain
[2] Univ Nacl Autonoma Mexico, Unidad Acad Juriquilla, Lab Res Adv Proc Water Treatment, Inst Ingn, Queretaro, Mexico
来源
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING | 2018年 / 6卷 / 05期
关键词
Stability; Heterogeneous Fenton; Ionic liquids; Sewage sludge; FeCl3; activation; Hydrothermal carbonization; ACTIVATED CARBON; SEWAGE-SLUDGE; HYDROTHERMAL CARBONIZATION; PHYSICOCHEMICAL PROPERTIES; HYDROGEN-PEROXIDE; FECL3; ACTIVATION; GRAPE SEEDS; WASTE TIRE; ADSORPTION; IMIDAZOLIUM;
D O I
10.1016/j.jece.2018.09.061
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The stability of two carbon-supported Fe catalysts in the catalytic wet peroxide oxidation (CWPO) of 1-Butyl-3-methylimidazolium acetate (BmimAc) was examined. One catalyst (Fe/AS) was obtained by chemical activation of dried sewage sludge with iron chloride at a FeCl3:sewage sludge mass ratio of 3 and the other (Fe/HTCS) by hydrothermal carbonization of the sludge in the presence of FeCl3 at a mass ratio of also 3. Fe/AS catalyst exhibited a well-developed porosity, whereas Fe/HTCS one did not show porosity. The carbon content was high in both catalysts, with a total Fe content of 5.2 and 6.6% (w/w) for Fe/AS and Fe/HTCS catalysts, respectively. An aditional Fe catalyst prepared by incipient wetness impregnation on a commercial active carbon support (Fe/AC) was used for comparison with the previous two. All catalysts were active in experiments of H2O2 decomposition and long-term CWPO runs (0.133 kg(Fe) h mol(BmimAc)(-1) at 80 degrees C). Whereas Fe/AC catalyst lost activity largely due to Fe leaching (90% of Fe-Bulk), Fe/AS and Fe/HTCS catalysts exhibited virtually no Fe leaching and hence fairly good stability. Fe/AS catalyst, which afforded complete removal of Bmim(+) and TOC conversion values around 30%, proved the most efficient catalyst.
引用
收藏
页码:6444 / 6450
页数:7
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