
54 Green Chemical Engineering
I. Rate equation for A ⇔ B
Consider a reversible catalytic reaction
We will write the rate equations for the three steps:
Step 1 (Adsorption):
Chemisorption of reactant A on to vacant site l resulting in the formation of intermediate
compound A ⋅ l is a reversible step
Al
k
k
A
A
+
′
⋅
The equation for the rate of adsorption of A, r
A
, is written assuming simple mass action
law to be applicable:
rkCC
C
K
AAAl
Al
A
(2.128)
where
C
A
: concentration of A on the catalyst surface (not attached to the surface)
C
l
: concentration of vacant site
C
Al
: concentration of chemisorbed A
k
A
: chemisorption rate constant of A
K
A
: adsorpt ...