Fig. 2: Adsorption of pyridine on siliceous porous materials in liquid water.
From: Understanding solvent effects on adsorption and protonation in porous catalysts
a Pyridine adsorption isotherms on adsorbents of varying average pore diameters in liquid water in ATR-FTIR at 20 °C. The pore-phase pyridine concentration on MAS is denoted by “+” signs and the pyridinium is denoted by dots. The sum of the pyridine on BAS and MAS is denoted with a dashed line for H/USY. b The pore-phase pyridine concentration with 0.1 M pyridine in the external solvent as a function of pore diameter. The ATR-FTIR spectra for the data in Fig. 2 can be found in Supplementary Figs. 26-31. Note that aluminosilicate FAU is used because siliceous FAU cannot be synthesized. Inset: depiction of the adsorbent pore diameter (dp). c Depiction of pyridine adsorption in micropores and mesopores where molecules of identical color experience similar adsorption energetics.
