CARBON MOLECULAR-SIEVES FROM WALNUT SHELL

Carbon molecular sieves (CMS) for air separation have been prepared fr om walnut shells. Walnut shells were first carbonized to produce a mic roporous char. The char was finely ground and extruded with coal tar a nd phenol-formaldehyde resin(PF resin) as binder. The extrudate was th en heat treated to produce a CMS having good air separation ability. C onditions including carbonization temperature, heat treatment temperat ure, and amounts of coal tar and PF resin were investigated. The micro pore structure of the CMS was investigated by means of gas adsorption. The predominating micropore size distribution of the CMS is 3, 3-4. 0 Angstrom.