小川 asked in 教育與參考考試 · 1 decade ago

化工動力學、幾個問題急需解答@@20點

1. For a reaction in series in a batch reactor:

where k1 = 1.0/min, k2 = 0.01/min, CA0 = 0.4 mol/L, CR0 = CS0 = 0

Find:

the maximum concentration of R

the time at which is reached

2. Derive a rate equation for a catalytic reaction: . Its possible reaction mechanism is described as follows:

(rate determining step)

Where KA and KB are equilibrium constant of adsorption and desorption steps, respectively. ks is the rate constant of surface reaction. S is an active site on the catalyst.

急需高手解答ˇˇ感謝

1 Answer

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  • 1 decade ago
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    1.

    這一題你沒給反應機構

    我就自己假設

    k1 k2

    A → R → S

    列出反應速率方程式:

    -rA = k1CA ........(1)

    rR = k1CA-k2CR........(2)

    rS = k2CR ........(3)

    列出設備方程式:

    -rA = -dCA/dt ........(4)

    rR = dCR/dt ........(5)

    rS = dCS/dt ........(6)

    將(1)(4)合併得CA = CA0exp(-k1t)

    將(2)(5)合併得CR = ~  ( 必為t的函數 )

    當 t = t(max)

    則 CR = CR(max)

    所以 dCR/dt = 0

    CR用(2)(5)合併得來的代進去對t微分

    即可求得 t(max)

    再把 t(max)丟回 CR

    即可求得 CR(max)

    我只能告訴你解法

    中間的過程太多了,20點不值得付出

    不懂的話我是建議你去問老師比較妥當~

    2.

    你題目沒給反應機構

    實在不知道怎麼解答你所要的觸媒反應式

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