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gas-diffusion
相关语句
  气体扩散
     STUDY ON THE MANUFACTURE OF Pt-C/PTFE GAS-DIFFUSION ELECTRODES
     Pt—C/PTFE型气体扩散电极制备的研究
短句来源
     Spectrophotometric Determination of Cyanide in Waste Water in a Flow Injection Analysis System With Gas-diffusion Separation
     微孔膜气体扩散分离流动注射光度法测定废水中氰化物
短句来源
     The curves of oxygen reduction current vs. potential polariz ation for the porous gas-diffusion electrode made from the nanophase γ-MnO2 ultramicro particle was researched.
     研究了用这种纳米γ MnO2超微粒子制成的多孔三相气体扩散电极的氧还原电流 电位极化曲线。
短句来源
     Study on the Manufacture of Pt/C Gas-diffusion Electrodes
     Pt/C气体扩散电极制备方法的探索
短句来源
     Review on gas-diffusion layer materials for PEM fuel cell
     PEM燃料电池用气体扩散层材料研究进展
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  “gas-diffusion”译为未确定词的双语例句
     Development survey of fuel cell and electrode material with gas-diffusion porous substrate made up of carbon-fiber paper home and abroad were demonstrated in the article. The function and performance demand and application prospect of carbon-fiber paper were also presented in it.
     阐述了国内外燃料电池及其多孔扩散层电极材料——碳纤维纸的发展概况,介绍了碳纤维纸的作用、性能要求与应用前景。
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  相似匹配句对
     Gas Station
     加油站
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     Gas Bearings
     气轴承
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     INTRODUCTION TO THE GAS-TO-LIQUIDS
     天然气制合成油介绍
短句来源
     identify the gas-bearing ;
     识别和评价气层;
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     Nonlinear Diffusion
     非线性扩散
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  gas-diffusion
For small samples, for which gas-diffusion processes do not affect the rate, the rate is controlled by a slow chemical reaction.
      
Formic acid was shown to be the only product of the reaction in the initially aprotic medium with the use of a hydrogen gas-diffusion anode.
      
The possibility of anodic generation of a solvated proton on a gas-diffusion electrode in an aprotic medium in the presence of carbon dioxide and 1,3-butadiene has been demonstrated.
      
Dynamic gas-diffusion techniques have been developed for measuring the binding energy for adsorption which are effective even when adsorbents of only small surface area are available.
      
Using drop surface temperatures, we were able to calculated analytically binary gas-diffusion coefficients of liquids in ambient air.
      
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The oxidation rates of molten cuprous sulphide were examined with variations of temperature,oxygen concentrations and air flow rates. The results showed that the oxidationrates of conjugate solution of Cu-Cu_2S sys- tem are constant,that is,the percentage of desulphurization of Cu_2S vers time is a straight line relationship.The slopes of the straight-lines increase with temper- atures,oxygen concentrations in the air and air flow rates. Effect of oxygen partial pressures: When Po_2<0.60 atm d(s%)/dt=k,=2.2×10~(-2).Po_2+0.82(S%/min.cm~2)....

The oxidation rates of molten cuprous sulphide were examined with variations of temperature,oxygen concentrations and air flow rates. The results showed that the oxidationrates of conjugate solution of Cu-Cu_2S sys- tem are constant,that is,the percentage of desulphurization of Cu_2S vers time is a straight line relationship.The slopes of the straight-lines increase with temper- atures,oxygen concentrations in the air and air flow rates. Effect of oxygen partial pressures: When Po_2<0.60 atm d(s%)/dt=k,=2.2×10~(-2).Po_2+0.82(S%/min.cm~2). When Po_2>0.6~1.0 atm, k_t=14.5×0~(-2)(S%/min.cm~2). The kinetic equation is: d(S%)/dt=k_t=(k·Po_2)/(β+k_2·Po_2) Effect of temperature: The specific rate constant increases with temperature,and the logarithmic rate constant vers 1/T(K)is a straight-line relationship.The equation of rates constant as function of temperature is: k_t-5.45×10~(-1)×exp[-7100/RT](S%/min.cm~2) which activation energy E=7100 cal/mol. Effect of air flow rates: When the air flow rate is below 200 cm~3/min,the rate constant increases with flow rates.Consequently,the rate of oxidation process is regarded as limited by oxygen diffusion in the gasphase at a definite temperature(1200℃).When the air flow rate is larger than 200 cm~3/min,the specific rate constant remains unchanged. Consequently,the velocity of oxidation process is determined by the rate of chemical reaction. Order of Reaction: The results show that at 1200℃ in the Cu-Cu_2S conjugate solution the desulp- hurization kinetics of Cu_2S is first order with respect to the oxygen partial pressure and zero order with respect to the sulphur concentration when Po_2<0.60 atm, i.e. d(S%)/dt=Ks.Po_2+A d(△S%/△t)/d(S%)=0 When Po_2>0.60 atm,the desulphurization kinetics is zero order with respect to the oxygen partial pressure and sulphur concentration. d(△S%/△t)/d Po_2=0 d(△S%/△t)/d(S%)=0 In the low sulphur single phase the desulphurization kinetics is first order with respect to the oxygen and sulphur concentrations,i.e. d(S%)/dt=Km(S%)Po_2+B In the plots of reaction rates against concentration of sulphur according to fol- lowing equations: d(△S%/△t)/d(S%)=0 d(△S%/△t)/d(S%)=-Km(constant) a turning-point of phase transformation of Cu_2S from conjugate solution to single phase is shown.At the turning-point of reaction rate,its sulphur content in the melts beginning to form single phase is 1.2 wt% at 1200℃. As to the activities of Cu_2S the similar forms of equations are obtained. At the turning-point of phase transformation,its sulphur content in the melts beginning to form single phase is 1.28 wt% at 1200℃. In the commercial copper converting practice,such as 40~50 ton furnace,the air- flow rates is about 400~500 M~3/min,equivalent to 6~8 M~3/ton Cu_2S.The oxidation rate is either gas phase control or liquid phase control. In our experiments,the air flow rate used exceeded 200 cc/min,corresponding to 13.3 M~3/ton Cu_2S.Under this condition neither the gas diffusion nor the liquid dif- fusion is the rate-determining step.Consequently,the data show that the chemical reaction adsorption is the rate-determining step in the oxidation of conjugate solution of Cu_2S. According to above kinetic equations the end-point of converting process may be controlled by continuous analysis of SO_2% during the white-metal blowing period.

本文研究了富氧吹炼、温度及空气流量等因素对熔体 Cu_2S 氧化脱硫速度的影响。试验结果表明,在 Cu—Cu_2S 体系中,反应速度为一常数,即在体系分层区,脱硫量与吹风时间成直线关系。直线斜率即反应速度随氧浓度、温度和空气流量的增高而增大。白冰铜(Cu_2S)在吹炼过程中的反应级数,在分层区:当Po_2<0.60atm 时,与氧分压为一阶反应,与硫浓度为零阶反应;Po_2>0.60atm 时,与 Po_2及硫浓度均为动力学上的零阶反应。在分层后的低硫单相区,用空气吹炼,与硫浓度及 Po_2均为一阶反应。试验还验证了:温度在1200℃时,用空气吹炼,脱硫速度由分层区转入低硫单相区时,有显著的转折点,与此转折点相应的含硫量约1.2%左右,和由热力学计算所得1.28%的含硫量相差不大。转折点以后的脱硫速度的降低,与含硫浓度的减少成直线关系,与硫活度的降低成比例。根据转折点前后的动力学方程式,讨论了铜转炉吹炼第二周期终点的控制问题。由于吹风量大,Cu—Cu_2S 系分层区吹炼过程的限制步骤,为氧分子在界面上的吸附作用,其动力学方程式与 Langmuir 等温吸附相似。

This paper reports on the results of the experiment using teflonbonded oxygen-gas diffusion electrode as the cathode in electrolytic H2O2 produc-tion.

本文报导氟塑氧气扩散电极作阴极,应用于电解制取H_2O_2的实验初步结果.

The effect of the gas diffusion rate on the chemical reaction rate

本文研究在铜锌铝催化剂上,一氧化碳变换反应中的气体扩散速率对化学反应速率的影响。建立了各反应气体在柱形催化剂内扩散过程的数学模型;并用正交配置法将模型离散后,以拟牛顿法求得数值解,获得颗粒内的气体浓度分布及催化剂的效率因子,并与其它简化模型作了比较;同时通过实验获得化学反应本征动力学方程及宏观反应速率,从而求得效率因子实验值。二维多组分扩散模型理论计算值与实验值是比较接近的,最高偏差13%,平均偏差为7.5%。而一维模型的偏差比其大2—3%,但能简化计算,节省机时。

 
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