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Role of CuO in improving NH3 and SO2 capture on nanoporous Fe2O3 sorbents
Journal of Colloid and Interface Science ( IF 9.9 ) Pub Date : 2018-03-12 , DOI: 10.1016/j.jcis.2018.03.027
Xiaowei Ma , Xiuyun Zhao , Aaron Liu , Matthew A. Rankin , Lisa M. Croll , R.A. Dunlap , J.R. Dahn

In this work, mixed Fe/Cu oxides as sorbents for SO2 and NH3 removal were investigated. Nanoporous iron oxide mixed with 10, 20 and 30 at.% CuO were prepared by thermal decomposition of the corresponding oxalates at 250 °C for 5 h in air. The mixed Fe/Cu oxalates were obtained from the co-precipitation of iron/copper sulfate and ammonium oxalate during ultrasonication. The physical properties of the oxalate precursors and the resulting mixed Fe/Cu oxides were characterized with SEM, TGA-DSC, FTIR, powder XRD and Mössbauer spectroscopy. The porosity was studied by N2 adsorption-desorption isotherms and small angle X-ray scattering. Evenly dispersed CuO hindered the crystallization of Fe2O3, which significantly increased the specific BET surface area from 211 m2/g for Fe2O3 to 354 m2/g for Fe0.8Cu0.2Ox. As a result, SO2 and NH3 adsorption on Fe0.8Cu0.2Ox were enhanced by about 70% compared to Fe2O3. Compared to Fe2O3-impregnated activated carbons, nanoporous Fe0.8Cu0.2Ox could capture five times more SO2 per unit weight, which will be attractive for applications in respirators with lower weight and smaller size.



中文翻译:

CuO在改善纳米多孔Fe 2 O 3吸附剂上NH 3和SO 2捕获中的作用

在这项工作中,研究了混合的Fe / Cu氧化物作为脱除SO 2和NH 3的吸附剂。通过在空气中将相应的草酸盐在250°C下热分解5小时,可制得与10、20和30 at。%CuO混合的纳米多孔氧化铁。混合的Fe / Cu草酸盐是在超声处理过程中铁/硫酸铜和草酸铵的共沉淀制得的。用SEM,TGA-DSC,FTIR,粉末XRD和Mössbauer光谱对草酸盐前体和所得混合的Fe / Cu氧化物的物理性质进行了表征。通过N 2吸附-解吸等温线和小角度X射线散射研究了孔隙率。均匀分散的CuO阻碍了Fe 2 O 3的结晶,这使BET比表面积从Fe 2 O 3的211 m 2 / g显着增加到Fe 0.8 Cu 0.2 O x的354 m 2 / g 。结果,与Fe 2 O 3相比,SO 2和NH 3在Fe 0.8 Cu 0.2 O x上的吸附提高了约70%。与Fe 2 O 3浸渍的活性炭相比,纳米多孔Fe 0.8 Cu 0.2 O x可以捕获五倍的SO 2。 每单位重量,这将对重量更轻,尺寸更小的呼吸器具有吸引力。

更新日期:2018-03-12
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