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[求助]
動力學(xué)同位素效應(yīng)(CH4/CD4)的原理
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我是做甲烷干重整催化劑反應(yīng)課題的。最近看一篇關(guān)于動力學(xué)同位素效應(yīng)的文獻(xiàn)。其中講到當(dāng)用CD4取代CH4時,CO的生成速率會大幅降低,從而說明CH4中C-H健的斷裂是一個緩慢的過程。反之,則說明是一個快速的過程。請教各位一下這是為什么?(原文:The results of the kinetic isotope effect for the reaction of carbon dioxide reforming of methane to synthesis gas over the Ni/La203 and Ni/'y-A1203 catalysts are presented in table 1. Before switching the mixture from CHa/COz/He to CDa/CO2/He, the reaction was run for at least 5 h to reach stable performance of the Ni/ La203 catalyst and pseudo-stable performance of the Ni/-A1203 catalyst. It is shown in table 1 that the rate of CO formation (Rco) over the Ni/La203 catalyst is significantly reduced upon replacing CH4 with CD4 in the feed mixture, indicating that breaking of the C-H bond of the CH4 molecule is a slow step over the Ni/ La203 catalyst. Only a small reduction in the rate of CO formation, by a factor of 1.02-1.08, was detected over the Ni/ A1203 catalyst upon switching CH4 / CO2 to CD4 / CO2, suggesting that methane activation over the Ni/A1203 catalyst is a fast step.) [ Last edited by X號君 on 2013-3-2 at 12:39 ] |

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