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溴酸钾催化氧化结晶紫-茜素红光度法测定废水中痕量铬(Ⅵ)贾华丽1,李艳霞1,王丽品1(1.河南省周口市周口师范学院化学系)摘 要:在H2SO4介质中,痕量铬(Ⅵ)能催化溴酸钾氧化结晶紫和茜素红褪色的指示反应,通过测量627 nm和423 nm处催化反应体系和非催化反应体系吸光度的变化,建立了双波长双指示剂催化动力学光度法测定痕量铬(Ⅵ)的新方法.方法的线性范围为0.04~0.16μg/mL,检出限为11.41 ng/mL.该方法用于电镀废液中铬(Ⅵ)的测定,测定值与原子吸收分光光度法测得结果一致,加标回收率为9......
Gas-solid reduction kinetic model of MgO-fluxed pelletsQiang-jian Gao,Feng-man Shen,Xin Jiang,Guo Wei,Hai-yan ZhengSchool of Materials and Metallurgy,Northeastern University摘 要:kinetic model fitting for the gas-solid phase reduction of pellets in tubular reactors(blast furnace,BF) was built up,and the equations of reduction reaction rate were given for pellets.A series......
Structure and Catalytic Behavior of CuO-ZrO-CeO2 Mixed Oxides 陈诵英1,王恩过1 (1.Institute of Catalysis, Zhejiang University, Hangzhou 310028,China) Abstract:The effect of doping CuO on the structure..., and enhances catalytic activity of CuO-ZrO-CeO2 mixed oxides for CO oxidation. Increasing ceria content in the mixed oxides can enhance the catalytic activity, but some impurities such as sulfate make......
学方程见表1.其中,为浸出率,k为反应速率常数,t为反应时间. 图7 闪锌矿氧压浸出体系过程电势变化 Fig. 7 Potential change of catalytic systems in oxygen pressure leaching process 表1 不同液固反应的动力学方程 Table 1 Kinetic equations... theory calculations of electronic strucfure of sphalerite with vacancy and impurity[J]. The Chinese Journal of Nonferrous Metals, 2010, 20(4): 765-771. [6] NIEDERKORN J S. Kinetic-study on catalytic......
J. Cent. South Univ. Technol. (2009) 16: 0513-0519 DOI: 10.1007/s11771-009-0085-4 Selective catalytic reduction of NO with NH3 over sol-gel-derived CuO-CeO2-MnOx/γ-Al2O3 catalysts ZHAO Qing-sen... CuO-CeO2-MnOx/γ-Al2O3 catalysts were synthesized by the sol-gel method. The performance of the CuO-CeO2-MnOx/γ-Al2O3 catalysts for the selective catalytic reduction (SCR) was studied in a fixed bed......
A COMPUTERIZED SYSTEM ON KINETIC ANALYSIS AND EVALUATION OF GAS/SOLID REACTIONS J.H.Liu1,S.K.Wei1,J.Y.Zhang1 (1.School of Metallurgical and Ecological Engineering, University of Science & Technology Beijing, Beijing 100083, China) Abstract:The present paper presents the structure, features and functions of a computerized system on kinetic analysis and evaluation of gas/solid reactions......
Thermodynamic and Kinetic Study of Crystallization Reaction of Fe/Dy Multilayers Form Amorphous State WANG Pei-xuan1,LI Sheng-li2 (1.Department of Materials Physics, University of Science... that the crystallization of amorphous films is controlled by both thermodynamic and kinetic conditions. The calculated free energies of crystalline Fe and Dy are significantly lower than those in the amorphous states......
CVOCs elimination by catalytic combustion郭利民School of Environmental Science and Technology,Huazhong University of Science and TechnologyHubei Key Laboratory of Processing and Application of Catalytic...,which are highly toxic and a contributor for secondary organic aerogels,tropospheric ozone and photochemical smog[1]. Many technologies have been developed to eliminate CVOCs emission. Catalytic......
J. Cent. South Univ. Technol. (2009) 16: 0876-0880 DOI: 10.1007/s11771-009-0145-9 Hydrogen sorption properties of nanocrystalline Mg2FeH6-based complex and catalytic effect of TiO2 LIU Yi(刘 燚... of transition metal chloride or oxide in Mg-Ni powders. SHANG et al[4] and HERRICH et al[14] added Cu and Pt respectively to Mg2FeH6 and found that there was no catalytic effect on Mg2FeH6 hydrogen......
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