An object of the present invention is to provide a method for manufacturing a porous body, the method making it possible to suppress volume shrinkage during drying at a pressure of 10.sup.2 Pa or more and 10.sup.6 Pa or less, and to obtain a porous body with a high porosity; and a porous body. The present invention is a method for manufacturing a porous body, the method including subjecting a gel that has a solvent including water and a structure body with a three-dimensional mesh structure to a drying treatment to produce a porous body, in which the drying treatment is carried out at a pressure of 10.sup.2 Pa or more and 10.sup.6 Pa or less and a temperature equal to or higher than a boiling point of the solvent such that an internal temperature of the gel is equal to or higher than an external temperature of the gel.

A facility for processing CO2 from a high-output CO2 source includes at least one CO2 distribution system having a supply circuit comprising an inlet end connected to the high-output CO2 source for collecting and storing the CO2, and an outlet end; drying means for drying in a CO2 atmosphere, connected to the CO2 distribution system, and configured to process said CO2 thus distributed during a drying operation and comprising storage means connected on the one hand to the outlet end of the supply circuit and on the other hand to the drying means, said storage means being configured to temporarily store the CO2 from the high-output CO2 source for later processing of said CO2.