Page 19 - Adsorption Technology & Design, Elsevier (1998)

16 Adsorbents

Figure 2.7 Example adsorbents

directly from the raw material, although the pores tend to be larger than with
materials produced via steam activation. Granular materials for use in
packed beds have particle sizes typically in the range 0.4-2.4 mm. Activated
carbon cloths are made from cellulose-based woven cloth and can have a
higher capacity and better kinetic properties than the granular, but cheaper,
forms. Cloths can have both high external surface areas and high internal
surface areas. Activated carbons can now be manufactured in monolithic
forms for low pressure drop applications or for the bulk storage of natural
gas.
Activated carbons contain a full range of pore sizes as shown in Table 2.1.
Micropore diameters are generally less than 2 nm while macropore
diameters are generally greater than 50 nm. Some pores may be inaccessible