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RISS 인기검색어
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- 저자 : Zan Qu (검색결과 3 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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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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Yongpeng Ma,Dongli Yuan,Xiaojing Zhang,Zan Qu,Wenjun Huang 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.2
In this work, we investigated the absorption characteristics of SO₂ and the effect of inhibitors on the desulfurization performances of Na₂SO₃. The results showed that the NO₂ had a competitive effect with SO₂ on SO₃<SUP>2-</SUP> which resulted in a significant decrease in the absorption capacity of SO₂. O₂ in the flue gas could decrease the absorption capacity of SO₂ due to the oxidation of Na₂SO₃. Besides, Na₂S₂O₃ had more excellent inhibiting effect on the oxidation of SO₃<SUP>2-</SUP>; the inhibition mechanism is understood on the basis of the free radical chain reaction, whereby S₂O₃<SUP>2-</SUP> combined with the sulfite free radical to form an inert substance, thus, quenching the reaction of free radical with the dissolved oxygen and invariably inhibiting the oxidation of SO₃<SUP>2-</SUP>. Furthermore, the intrinsic and the apparent oxidation kinetics of Na₂SO₃ oxidation process with Na₂S₂O₃ were investigated to explain the relationships between consumption rates of SO₃<SUP>2-</SUP> and the absorption capacities of SO₂ under different components in flue gas and absorption solution.
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