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小甲009

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1.反应步骤包括:1)液态反应物或产物通过液体边界层的外扩散;2)液态反应物或产物通过液体边界层的内扩散;3)界面化学反应。固态反应物RE2(CO3)3近似按球形处理,假设液态产物的扩散速率足够快,则3个依次发生的动力学方程如下:

2.式中D1和Ds分别为反应物A通过液体边界层和固体产物层的有效扩散系数;δ为液体边界层厚度;kr为界面化学反应速率常数。
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小甲009

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2楼2010-01-22 17:57:21
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ice625

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小甲009(金币+50):thanks 1-26 10:23
1.The reaction steps include: 1) liquid reactants or products through the the external diffusion of liquid boundary layer; 2) liquid reactants or products through the  internal diffusion of the liquid boundary layer; 3) interface chemical reaction. Solid-state reactants (RE2 (CO3) 3) are approximation treated with by spherical,if it is assumed that the diffusion rate of liquid product fast enough, then the three kinetic equation sequence occurre as follows:
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3楼2010-01-22 20:06:44
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ice625

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2.D1 and Ds in the expression are the effective diffusion coefficient of the   liquid boundary layer and solid produt layer separately when A reactant through both of them;the   thickness  of liquid boundary layer is δ;the interface chemical reaction rate constant is kr.
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4楼2010-01-22 20:41:56
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