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RISS 인기검색어
- 검색키워드
- 저자 : Jiangkun Xie (검색결과 2 건)
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Design of Co3O4/CeO2–Co3O4 hierarchical binary oxides for the catalytic oxidation of dibromomethane
Jian Mei,Jiangkun Xie,Yaning Sun,Zan Qu,Naiqiang Yan 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.73 No.-
Developing the catalysts that can efficiently degrade brominated volatile organic compounds (Br-VOCs)is a priority due to the low activity, the low product selectivity, and the low resistance to Br-poisoning. Inthis work, Co3O4/CeO2–Co3O4 hierarchical binary oxides were designed as a high-performance catalystfor the catalytic oxidation of dibromomethane (CH2Br2) as a model pollutant for Br-VOCs. The surface ofcarbon spheres was coated with a layer of CeO2 nanoparticles, and core-shell CSs@CeO2 were theprecursors of Co3O4/CeO2–Co3O4 hierarchical binary oxides. Co3O4/CeO2–Co3O4(HS) had a hierarchicalporous structure, there was a strong interaction between Co3O4 and CeO2 Co3O4/CeO2–Co3O4(HS)showed an excellent catalytic activity, and its T90 value was only 321 C. Meanwhile, Co3O4/CeO2–Co3O4(HS) showed good stability for at least 30 h. Co3O4 provided the active sites for CH2Br2 oxidation,and the hierarchical porous structure and high specific surface area were conducive to the adsorption ofCH2Br2 molecules. Meanwhile, CeO2 promoted the oxygen mobility of the composite and the oxidationperformance of Co3O4. CH2Br2 molecularfirstly adsorbed on Co3O4/CeO2–Co3O4(HS) surface, anddissociated to form the intermediates (i.e., formate species, and methoxy species), which werefinallyoxidized to CO and CO2, and Br species were removed in the form of HBr and Br2.
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Experimental and theoretical analysis of element mercury adsorption on Fe3O4/Ag composites
Lu Dong,Jiangkun Xie,Guangping Fan,Yaji Huang,Jun Zhou,Qingke Sun,LiangWang,Zhengwen Guan,Di Jiang,Ye Wang 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.11
A novel magnetic nano-sorbent Fe3O4/Ag was synthesized and applied to capture the elemental mercury from the simulated flue gas. The morphology, components and crystal phase of the sorbents were characterized by transmission electron microscope (TEM), energy dispersive spectrometry (EDS) and X-ray diffraction (XRD), respectively. The mercury removal performance of the sorbents was investigated through the fixed-bed tests. The results indicated that silver was successfully loaded on the surface of Fe3O4 particles, which could significantly enhance the Hg0 removal performance of the sorbents. Flue gas components, including CO2, SO2, and NO, have little impact on the Hg0 removal performance of Fe3O4/Ag sorbents, while O2 has a slightly positive effect. The Hg0 removal efficiency decreased with the increasing of temperature, Hg0 inlet concentration and gas hourly space velocity. Only one broad mercury desorption peak at approximately 210 oC could be observed during the temperature-programmed desorption (TPD) process, which indicated that mercury species existing on the surface of Fe3O4/Ag sorbents might be elemental mercury instead of oxidized mercury. Furthermore, the reusability tests showed that the Fe3O4/Ag sorbents could be efficiently regenerated and reused. Finally, the theoretical analysis based on the DFT method showed that a weak chemisorption of Hg0 on Fe3O4 sorbents changed to a strong chemisorption when silver was loaded. The results of theoretical analysis conformed to the experiments results well.
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