I tried to use the sorption module in materials studio to study the adsorption isotherm of carbon dioxide on FUA zeolite with a silicon aluminum ratio of 1:1. FUA zeolite has balanced its charge by adding Na+. But the final results indicate that the carbon dioxide adsorption capacity of my model is much lower than the carbon dioxide adsorption capacity in the literature. (For example, under conditions of 293K and 200kpa, FUA adsorbs 25 carbon dioxide molecules, while the actual adsorption can reach around 55 carbon dioxide molecules) I don't know what happened. The original file is below. Can anyone help me answer this?