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1.根据Arrhenius公式[8]K=Aexp(−Ea/RT)两边取对数可得，lgK=lgA−Ea/RTlge。式中：A为频率因子，Ea为表观活化能，R为摩尔气体常数，T为热力学温度。由图4可以求得不同温度下浸出反应的速率常数K。用lgK-1/T作图(如图7所示) 2.由图8可得直线的斜率为-0.18817，截距为-0.25774。计算得：Ea=8.5166kJ/mol，A=0.7485。将以上所得的参数代入Arrhenius公式和固膜内扩散控制方程可得宏观动力学方程具体表达式为1−2/3x−(1−x)2/3=[0.7485exp(-963.53/T)]t |
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小甲009(金币+60,VIP+0):thanks 1-22 18:02
小甲009(金币+60,VIP+0):thanks 1-22 18:02
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1.根据Arrhenius公式[8]K=Aexp(−Ea/RT)两边取对数可得，lgK=lgA−Ea/RTlge。式中：A为频率因子，Ea为表观活化能，R为摩尔气体常数，T为热力学温度。由图4可以求得不同温度下浸出反应的速率常数K。用lgK-1/T作图(如图7所示) Take the logarithm on both sides of the Arrhenius equation K=Aexp(−Ea/RT), where A is the frequency factor, Ea is the surface activation energy, R is the mole gas constant and T is the thermodynamic temperature. The speed constant K at different temperature can be derived in figure 4 from the lgK-1/T plot. 2.由图8可得直线的斜率为-0.18817，截距为-0.25774。计算得：Ea=8.5166kJ/mol，A=0.7485。将以上所得的参数代入Arrhenius公式和固膜内扩散控制方程可得宏观动力学方程具体表达式为1−2/3x−(1−x)2/3=[0.7485exp(-963.53/T)]t It is seen that the slope of the line is -0.18817 and the intercept is -0.25774. The calculated Ea and A are Ea=8.5166kJ/mol，A=0.7485, respectively. The specific expression of the macro kinetic equation can be achieved as 1−2/3x−(1−x)2/3=[0.7485exp(-963.53/T)]t by substituting the derived parameters into Arrhenius equation and solid-film inner diffusion control equation. [ Last edited by phyweiw on 2010-1-21 at 21:47 ] |
2楼2010-01-21 21:45:52
