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I think the difference between adsorption and absorption is that in absorption, substance goes into another substance else while in adsorption, a substance/molecule sits on top of the other. For heterogeneous catalysts I think the importance of adsorption vs. absorption is that the reactants sit on the SURFACE of the catalyst rather than going into the catalyst.
As Lavelle mentioned in class, I think the main difference between absorption and adsorption is that in absorption, a substance goes inside another substance (as in water into a sponge) whereas in adsorption, the reactants just sit on the surface of the catalyst.
In Adsorption, Dr. Lavelle mentioned that you'd want to maximize the surface area of the catalyst so that more of it is making contact with the reactants. In absorption, that wouldn't really be a problem. I agree with Destiny that it's not something that we need to worry about too much.
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