I find myself in quite a pinch: I have to sustain a Chemical Physics exam, and I know for a fact that the professor often asks this particular question:
Suppose that we have both a reacting species and an inhibitor in a homogeneous solution, and we insert a solid catalyst in it. What is the equation that describes the variation of the inhibitor's concentration in this heterogeneous catalysis?
I know for a fact that four different types of flows are included (or at least the professor explained it that way): two "scalar" flows, identified by the consumption of reagent and the consumption of inhibitor, and two "vectorial" flows, identified by the creation of a gradient in concentration of the two species.
However, I can't seem to find or even build up a satisfying equation that describes it. Can someone help?