Effects of compression on the textural properties of porous solids

This work deals with the analysis of the effects of compression in the textural properties, the crystallinity and the packing density of porous solids it has been found that compression produces the decrease of both, the pore volume and the interparticle voids of porous solids The reduction of the pore volume depends on the mechanical strength of the material. Activated carbons and inorganic porous oxides With a high mechanical strength. show a relatively low reduction of their pore volume, while porous solids Ill which the pore walls are constituted by organic frameworks, like MCF-5. have a lower mechanical strength and thus, their porous texture is largely affected by compression. In general terms, all increasing compressive pressure produces the removal of pores in the following sequence: mesopores, broad micropores and narrow micropores Thus, compression of porous materials could be considered is a procedure to tailor the pore volume and the pore size distribution of porous solids The results obtained ill this work allow affirming that, in the preparation of adsorbent materials, together with the development of a high specific pore volume or a Specific Surface area. the behaviour upon compactatation must. undoubtedly. be taken into account (C) 2009 Elsevier Inc All rights reserved