degradation characteristics of wood using supercritical alcohols使用超临界醇降解木材的特点.pdfVIP

Energies 2012, 5, 5038-5052; doi:10.3390/en5125038 OPEN ACCESS energies ISSN 1996-1073 /journal/energies Article Degradation Characteristics of Wood Using Supercritical Alcohols Jeeban Poudel and Sea Cheon Oh * Department of Environmental Engineering, Kongju National University, 275 Budae-dong, Cheonan, Chungnam 330-717, South Korea; E-Mail: jeeban1985@ * Author to whom correspondence should be addressed; E-Mail: ohsec@kongju.ac.kr; Tel.: +82-41-521-9423; Fax: +82-41-552-0380. Received: 24 September 2012; in revised form: 20 November 2012 / Accepted: 20 November 2012 / Published: 27 November 2012 Abstract: In this work, the characteristics of wood degradation using supercritical alcohols have been studied. Supercritical ethanol and supercritical methanol were used as solvents. The kinetics of wood degradation were analyzed using the nonisothermal weight loss technique with heating rates of 3.1, 9.8, and 14.5 °C/min for ethanol and 5.2, 11.3, and 16.3 °C/min for methanol. Three different kinetic analysis methods were implemented to obtain the apparent activation energy and the overall reaction order for wood degradation using supercritical alcohols. These were used to compare with previous data for supercritical methanol. From this work, the activation energies of wood degradation in supercritical ethanol were obtained as 78.0–86.0, 40.1–48.1, and 114 kJ/mol for the different kinetic a