Porous solid for gas adsorption separation and gas adsorption separation process employing it

A gas adsorption separation process whereby adsorption separation of components in a gas is accomplished by contacting the gas with a porous solid having an X-ray diffraction pattern with at least one peak at a diffraction angle corresponding to a d value of 1 nm or greater;

• and
• having a nitrogen adsorption isotherm measured at liquid nitrogen temperature with at least one section where the change in nitrogen adsorption in terms of the volume of nitrogen under standard conditions is 50 ml/g or greater with a relative vapor pressure change of 0.1 in a relative vapor pressure range of 0.2-0.8;
• wherein said porous solid possesses mesopores with a median pore size of 2-50 nm in the pore size distribution curve and pore walls that are porous.

The gas adsorption separation process according to 10, wherein the thickness of said pore walls is 2 nm or greater.