セルロースの熱分解と焦げ臭

抄録

Pyrolysis mechanism of cellulose and it's roasted odor were studied by odor sensor, GC-MS and TG-MS. The roasted odor was generated from 170°C when cellulose was heated and decomposed. Odor sensor made of tin oxide semiconductor thin film detected the odor products at 170°C. A human nose could detect the odor at the same temperature. The human and the artificial nose could be understood to sense the same evolved gas among the decomposition products. We analyzed the decomposition products of cellulose and found levoglucosan as a main product around 300-400°C by GC-MS under He condition. TG-MS study was carried out under air condition and levoglucosan was detected. Levoglucosan (mp 182°C, bp 280°C) was estimated to sublimate over the temperature of 200°C. When the cellulose pyrolized, the chemical weak bonding of -O- was scissored randomly. Finally this scission stopped when it created the monomer unit of cellulose, i.e., levoglucosan. Considering these facts we concluded the roasted odor by the decomposition of cellulose must be levoglucosan.