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- 저자 : Songjian Zhao (검색결과 2 건)
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Jian Mei,Zan Qu,Songjian Zhao,Xiaofang Hu,Haomiao Xu,Naiqiang Yan 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
Co3O4 catalysts modified with Mn and Ti, prepared by co-precipitation method, were used for catalytic oxidation of dibromomethane (CH2Br2), a model molecule for brominated volatile organic compounds (BVOCs). Addition of Ti or Ti + Mn distorted the crystal structure and led to the formation of a Co–O–Ti solid solution. The addition of Mn further enhanced the surface acidity and redox ability of the catalysts. Co–Mn–Ti exhibited the highest activity with a T90 of approximately 234 °C and the highest selectivity to CO2 at low temperatures. Additionally, Co–Mn–Ti showed good stability for at least 30 h at 500 ppm CH2Br2, 0 or 2 vol% H2O, 0 or 500 ppm p-xylene (PX), and 10% O2 at a gas hourly space velocity of 60,000 h−1, and the final products were COx, Br2, and HBr, without the formation of other Br-containing organic byproducts. This high catalytic activity was attributed to its high specific area, high surface acidity, and strong redox property. Furthermore, the synergetic effect of Co, Mn, and Ti made it superior for CH2Br2 oxidation. A plausible reaction mechanism for CH2Br2 oxidation over Co–Mn–Ti catalysts was proposed based on the analysis of the products and in situ diffuse-reflectance infrared Fourier transform spectroscopy results.
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Daorong Sun,Zhen Li,Shouqiang Huang,Fengli Yang,Jiawen Chi,Songjian Zhao 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.100 No.-
High-quality spinel mixed ferrites (M-Fe) are obtained from the electroplating wastewater, which arethen used as adsorbents for the removal of elemental mercury (Hg0) in theflue gas to simultaneouslyrealize the purpose of waste resource utilization and pollution control. In the “ferrite process”, throughadjusting the dosages of ferrous sulfate (FeSO4 7H2O), the chromium (Cr) in wastewater can be fullyrecycled to synthesize the M-Fe adsorbents with good crystal morphology and chemical stability, andthey can be easily separated by applying a magneticfield. Hg0 removal experiments indicated that thefeeding mass ratio of FeSO4 7H2O: Cr6+ and temperatures had great influence on mercury removalefficiency, and the M-Fe adsorbents with FeSO4 7H2O: Cr6+ mass ratio of 100: 1 (M-Fe (100)) had thehighest Hg0 removal performance with nearly 100% at 100℃. In addition, M-Fe (100) presented goodsulfur resistance, which remained above 90% Hg0 removal efficiency after SO2 injection, and it can recoveractivity when stopping SO2. The XPS and desorption dynamics analysis showed mercury existed in theform of physically and chemically adsorbed states. Adsorption kinetic studies manifested that surfaceactive sites were the adsorption rate controlling step, and inner active sites played an important role inmercury adsorption process. Mercury equilibrium analysis indicated mercury amount during adsorptionand desorption process was approximately identical, manifesting M-Fe (100) was well recyclablemagnetic adsorbent.
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