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phiphi325鐵蟲 (小有名氣)
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[交流]
反應(yīng)動(dòng)力學(xué) 菜鳥一問 已有5人參與
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請(qǐng)問,為什么反應(yīng)動(dòng)力學(xué)研究(比如計(jì)算活化能),起始10-20% conversion 最重要? 出處是什么? 真誠(chéng)請(qǐng)教! |
鐵桿木蟲 (正式寫手)
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銅蟲 (小有名氣)
金蟲 (小有名氣)
小木蟲
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this is a basic kinetic question. in gerneral, a reaction involved several processes: diffusion, adsoprtion, reaction, desorption and diffusion. at low conversion, the rate determination step is controlled by the reaction, but not the diffusion. it reflects the kinetic nature. Therefore, in most of the kinetic studies, low conversion was used. if conversion is higher, such as 90%, now the diffusion will become the rate determination step. So, if using this process, it will not give a kinetic information because of the rate is controlled by the diffusion. I do not know how to attach a graph. if then a curve of reaction constant vs. 1/T will demonstrate it well . |

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