. 2021 Oct 21;143(43):18305–18316. doi: 10.1021/jacs.1c09269

Table 1. Rate Constants for Desorption and Diffusion of Ammonia on Platinum^a,^b.

elementary rate constants	fitted parameters	fit results
k_d^T(T)	E_a,d^T/eV	1.09 ± 0.02
k_d^T(T)	log₁₀(A_d^T/s^–1)	14.8 ± 0.2
k_h^S(T)	ΔE_ST/eV^c	0.23 ± 0.03
k_h^S(T)	log₁₀(A_h^S/s^–1)	13.7 ± 0.6
k_h^T(T)	E_a,h^T/eV	0.73 ± 0.04
k_h^T(T)	log₁₀(A_h^T/s^–1)	13.6 ± 0.4
derived quantities
k_d^S(T) = k_dk_h^S/k_h	E_a,d^S/eV	1.32 ± 0.04
k_d^S(T) = k_dk_h^S/k_h	log₁₀(A_d^S/s^–1)	14.9 ± 0.6
D^T(T)^d	log₁₀(D₀^T/cm² s^–1)	–1.9 ± 0.4

Results were obtained from the global fit of the kinetics model to experimental desorption rates from Pt(111) and Pt(332).

The elementary rate constants are parametrized according to the Arrhenius equation: k(T) = A exp(−E_a/k_BT).

E_a,h^S = E_a,h + ΔE_ST. Since A_h^S ≈ A_h, the difference of activation energies ΔE_ST is nearly equal to the difference of binding energies ΔE_0, ST.

Inline graphic , where D₀^T is derived from A_h following ref (29).

Table 1. Rate Constants for Desorption and Diffusion of Ammonia on Platinuma,b.

Table 1. Rate Constants for Desorption and Diffusion of Ammonia on Platinum^a,^b.