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She-Min Zhu,Da-Hai Zheng,Yuesong Shen,Yun-Shun Qiu,Bing Li,Yan-Wei Zeng,Shubao Shen,Shemin Zhu 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-
Effects of catalyst loading amount, reaction temperature, O2 concentration, NH3/NO molar ratio and SO2 on low-temperature catalytic performance of the Mn–La–Ce–Ni–Ox (Mn/La/Ce/Ni = 2.5:2.5:1:1 in mol)/ PPS for NH3-SCR of NO were mainly studied. Results showed that the filter with catalyst loading amount of 250 g/m2 obtained more than 95% NO removal efficiency at 200 8C under filtration velocity of 1 m/min. The NO removal efficiency was still above 85% by injecting 300 ppm SO2 at 200 8C. Anyway, the Mn–La– Ce–Ni–Ox/PPS catalytic filter is promising to achieve the expectation of simultaneous removing particulate and NOx from low-sulfur flue gas in cement kiln.
Adsorption equilibrium, kinetics and mechanism studies of mercury on coal-fired fly ash
Qiang Zhou,Yufeng Duan,Chun Zhu,Jun Zhang,Min She,Hongqi Wei,Yaguang Hong 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.7
Fly ash samples were collected from the electrostatic precipitator (ESP) of a 600MW pulverized coal boiler firing Zhungeer bituminous coal in China to evaluate and explore its mercury adsorption capacity and mechanism. Samples characterization was conducted to feature their morphologies correlated to mercury content, and experimental studies on mercury adsorption in a fixed-bed apparatus were carried out to further verify its mercury adsorption availability. Based on the experimental data, adsorption isotherm was modeled with Langmuir, Freundlich, and Temkin equations. Adsorption kinetic analysis was also performed. The results show that mercury content of fly ash samples is associated with particle size, unburned carbon content and functional groups of Al-O/Si-O or Si-O-Si/Si-O-Al tetrahedron on fly ash. Increase of initial mercury concentration is beneficial to promote mercury adsorption due to the enhancement of mercury diffusion force onto the fly ash surface, mercury intraparticle diffusion rate and initial mercury adsorption rate. Fly ash with medium size displays better mercury adsorption capacity. Smaller particle size results in higher specific surface area, but brings about low specific surface area utilization rate for mercury adsorption. Freundlich isotherm equation presents better fitting result, indicating that fly ash surface is non-uniform. Mercury adsorption on fly ash at 120 oC is mainly physisorption enhanced by chemisorption with ΔG at −36.73 kJ/mol. The pseudo-first-order kinetic model can describe the adsorption process more accurately and predict mercury adsorption capacity of fly ash preferably, showing that mercury adsorption on fly ash surface in fixed-bed is controlled dominantly by external mass transfer.
Qiong Huang,Zhi-Yuan Zhang,Wen-Jiao Ma,Ying-Wen Chen,She-Min Zhu,Shu-Bao Shen 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.2
The catalytic combustion of toluene over Ni–Mn mixed complex supported on industrial cordierite was investigated. The catalysts were prepared by the wet impregnation method and characterized by using the Brunauer Emmett Teller (BET), Scanning Electron Microscopy (SEM), X-ray diffraction (XRD),Transmission Electron Microscope (TEM) and X-ray fluorescence (XRF). The catalytic activity toward the complete oxidation of toluene to CO2 and H2O strongly depended on the molar ratio of Ni/Mn, loading amount of Ni–Mn oxides, and calcination temperature. All the results above indicated that the Ni–Mn complex oxide catalyst calcined at 400 8C with 0.5 mol ratio of Ni/Mn, 10 wt.% loading amounts, and showed the highest activity as complete oxidation of toluene.
Qiong Huang,Shu-Bao Shen,Xiaokang Yan,Bing Li,Xiaoliang Xu,Ying-Wen Chen,She-Min Zhu 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.2
Several catalysts of the general formula, MMnOx (M = Co, Ni, Fe and Cu), were synthesised through the impregnation method; their activities were shown to be enhanced by the addition of a small amount of Pd (0.01–0.1 wt%). These catalysts exhibit different activities for the catalytic oxidation of CO, due to the different valence states of various transition metal oxides. The introduction of Pd prominently enhanced both the reduction and oxidation capabilities of the catalysts. These catalysts were optimised for oxidation activities by designing orthogonal experiments. Based upon the catalysts’ properties, the stability of these samples and their ability to resist steam over Pd/CoMnOx/cordierite were investigated.
Xiaokang Yan,Shu-Bao Shen,Qiong Huang,Bing Li,Xiaoliang Xu,Ying-Wen Chen,She-Min Zhu 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.2
Catalytic combustion of CO over perovskite-type oxides LaCo0.5M0.5O3 (M = Mn, Cr, Fe, Ni, Cu) and LaCo0.5Mn0.5O3 supported on cordierite were investigated. The catalysts were synthesized by impregnation method with citrate and characterized by XRD, SEM and TPR. The LaCo0.5Mn0.5O3catalyst showed much higher activity in CO oxidation compared with LaCo0.5M0.5O3 (M = Cr, Fe, Ni, Cu)due to different kinds of valence state and lattice oxygen content. When LaCo0.5Mn0.5O3 was supported on cordierite, the activity was improved significantly. However, calcining temperature and the presence of water vapor affected the catalytic activity due to sintering and competition of H2O with CO for adsorption, respectively.