Effect of chemical activation on sorption characteristics of selected wood samples

Abstract

Two samples of hardwood, beech and a mixture of beech and oak were pyrolyzed by continuous chemical activation with K2CO3. Two final temperatures were tested on activated samples (550 °C, 750 °C). In the same temperature regime, also non-activated original samples were pyrolyzed. The sorption for carbonaceous material was measured with a high-pressure thermal analyzer (TGA-HP50) in the presence of nitrogen and the carbon dioxide atmosphere in the range of pressure from 0,03 to 4,5 MPa, respectively from 0,03 to 2 MPa. The sorption experiments were carried out at three different temperatures – 20, 30 a 40 °C. The tests indicate that the final temperature of activation and sorption conditions (pressure, temperature) have significant impact on sorption properties of material.