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.