The correlations between the D4 adsorption capacities and BET
surface area, total pore volume, and mesopore volume have been
reported in the literature [12,13,23,50] and are in good agreement
with this study. Moreover, this study further contributes to this
research topic with the correlations between the D4 capacities
and the external surface area and mesopore volume. The external
surface area and mesopore volume have even better data regression
than the BET surface area and the total pore volume. This
means that the external surface area and mesopore volume of
the mesoporous aluminosilicates have stronger impacts on the
D4 adsorption than the other textual parameters. As has been mentioned
in Section 3.3, the higher external surface area will promote
the adsorption of D4 by increasing the residence time for the D4
bulk diffusion, while the larger pore size will affect the diffusion
rate of D4.