Figure 5. The BJH (a) and DFT (b)
pore distribution plots of 350 ℃ degassed sample and room condition
equilibrium (RC.EQ).
Since both pore surface area, pore volume and the amount of micropores
decrease as the adsorption temperature decreases, the availability of
silver sites may decrease due to the increasing water coverage.
Potential Reaction Pathway and Diffusion
Limitation
For the chemisorption with gas phase product generated, Zhou and
White32 and Robb and Harriott33suggested that the formation of gases and the successive diffusion
limitations may result in a fractional order reaction, which has been
observed in the CH3I adsorption on
Ag0-Aerogel by Tang et al.23 To
explain this observation, a potential reaction pathway is proposed.