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Topic: Heterogenous catalysis problem  (Read 2184 times)

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Offline LovesOrganic

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Heterogenous catalysis problem
« on: February 04, 2017, 04:44:42 PM »
Hello everyone! I'm having some trouble with a problem concerning adsorption kinetics. So, here it is :
Consider a process A+B ::equil:: C+D
1) At standard conditions an equimolar mixture of A and B are passed over a catalyst. Assume the catalyst is 95% efficient and the mixture reaches equilibrium. What's the ΔG° for this reaction?
2) Assume large surface of catalyst is available intially. In the table you'll find several p0 and initial rates. Find the missing rate.
pA, barpB, barrC, bar*s-1
0.100.904*10-4
0.150.855.6*10-4
0.250.758.2*10-4
0.30.7??

The first part was standard and I obtained a value of ΔG°=-13.4 kj/mol.
For the second part... I'm very confused and not sure where to start from. If this were a simple reaction (without adsorption), I'd try finding the rate law. Actually, I have tried this but got values that are not whole and differ depending on which values I choose, hence I believe this to be the wrong approach.

I've done some reading around and found this equation
[itex]r=\frac{k_r\alpha_A\alpha_B p_A p_B}{(1+\alpha_A p_A+\alpha_B p_B)^2}[/itex]
I could write three such equations and solve a system of simultaneous equations but even wolfram couldn't solve it.
And that's where I am stuck right now. Any help would be highly appreciated :)

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