Nonlinear Frequency Response Analysis as a Tool for Identification of Adsorption Kinetics: Case Study—Pore-Surface Diffusion Control

Table 3

Characteristic features of F₂(ω,ω) for different mechanisms (spherical geometry).

	Amplitude F2(ω,ω)	Phase F2(ω,ω)
Pore-surface diffusion	Two inflections	Minimum followed by maximum
Pure pore diffusion	One inflection	Single minimum
Micropore diffusion [18]	No inflections	Sigmoidal (single inflection)