Adsorption–Reaction Kinetics
A(g) + * → A* → B(g) + * | First-order Langmuir with surface reaction
Parameters
Fixed
A
rxn
= 10
11
s⁻¹ · A
ads
= 10
8
s⁻¹
A
des
= 10
13
s⁻¹ · E
ads
= 0
At T = 1000 K
Rate Expressions
k
r
= A
r
· exp(−E
a
/RT)
k
a
= A
a
· exp(0/RT)
k
d
= A
d
· exp(−E
d
/RT)
─────────────────────
K
= k
a
/ (k
d
+ k
r
)
θ
= KP / (1 + KP)
rate
= k
r
· θ
k
eff
= k
r
· K · P / (1 + KP)
Potential Energy Diagram
Surface View
8×8 lattice at T = 1000 K
Empty *
A*
TS ‡
B(g) ↑
●
A lands →
●
reacts →
●
B(g) desorbs ↑