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iris19860908金蟲 (小有名氣)
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【求助】關(guān)于催化反應(yīng)中的活化能 已有7人參與
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各位蟲友,我在做有關(guān)氣體催化反應(yīng)的過程中想要得到反應(yīng)的活化能,即在不同種材料上處理反應(yīng)的活化能,改變反應(yīng)溫度得到一些相關(guān)的不同材料反應(yīng)的數(shù)據(jù),但是如何得到活化能呢?是通過軟件還是手算呢? 還有就是動力學(xué)實(shí)驗(yàn)應(yīng)該如何進(jìn)行呢?本人剛接觸氣體催化反應(yīng),還請各位蟲友多多幫助! [ Last edited by iris19860908 on 2010-8-23 at 16:34 ] |
金蟲 (小有名氣)
小木蟲
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according to the question, you want to obtain the reaction active energy. if you want to know the adsorption behavior, then the adsorption energy could be done by soprtion experiments. the basice equation is : r=d[c]/dt, Here c is the the reactant concentration, and t is the contact time. as we know the concentraiont change with the raction time, it is c=c0(1-x) herein the x is conversion, so d[c]=C0d[x] t=W/F, from those, then you could get the rate equation r=C0 d[x]/D[W/F] normally, the weight the catalyst dosen't change, so, it could be obtained by changing the flow rate. at one temperature, reaction rate is r=C0 x/[W/G] according to Arrhinius equation, r=a exp(-Ea/RT) Ln(r)=-Ea/RT plot the r as a function of reaction temperature, normally, you could get a line, from the slope, you could calculate the active energy. |

木蟲 (正式寫手)
金蟲 (小有名氣)
木蟲 (正式寫手)
木蟲 (職業(yè)作家)
捐助貴賓 (正式寫手)
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樓主的問題很大..... 建議:如果你有某一溫度下,催化反應(yīng)后反應(yīng)物不同時(shí)間的濃度數(shù)據(jù)的話,你可以擬合動力學(xué)方程。先從理論書上或者文獻(xiàn)上找到適合你的氣體催化反應(yīng)的動力學(xué)模型,用軟件(eg.Matlab,polymath......)擬合你的實(shí)驗(yàn)數(shù)據(jù),弄出你的反應(yīng)動力學(xué)模型,就可以得到在該溫度下你的反應(yīng)速率常數(shù)k,同理得到另一溫度下的k,通過不同的k值你可以得到你反應(yīng)的活化能(應(yīng)該是表征活化能)........ 具體做的樓主自己翻書,查文獻(xiàn)..... |

金蟲 (小有名氣)
銀蟲 (小有名氣)
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