Studies of the Structure of Porous Carbon Materials Obtained by Pyrolysis of Microcrystalline Cellulose from Birch Wood
B. N. KUZNETSOV1,2, N. V. CHESNOKOV1,2, YU. L. MIKHLIN1, S. I. TSYGANOVA1, N. M. MIKOVA1, N. V. GARYNTSEVA1 and N. M. IVANCHENKO1
1Institute of Chemistry and Chemical Technology, Siberian Branch of the Russian Academy of Sciences, Akademgorodok, 50-24, Krasnoyarsk 660036 (Russia)
2Siberian Federal University, Prospekt Svobodny 79, Krasnoyarsk 660041 (Россия)
Keywords: древесина березы, делигнификация, микрокристаллическая целлюлоза, пиролиз, пористый углеродный материал, выход, строение, birch wood, delignification, microcrystalline cellulose, pyrolysis, porous carbon material, yield, structure
Abstract
Optimal conditions were chosen for obtaining microcrystalline cellulose (MCC) by means of birch wood delignification by hydrogen peroxide in the presence of sulphuric catalyst for the purpose of obtaining MCC with low lignin and hemicellulose content. The evolution of MCC into porous carbon materials (PCM) during pyrolysis within temperature range 200-800 °C was studied by means of IR spectroscopy, XPA, DTA-DSC, XPES, SEM and elemental analysis. It was established that depending on the final pyrolysis temperature and heating rate, the yield and specific surface of solid pyrolysis products vary within the range 97.3-18.3 mass % and 1-473 m2/g, respectively. The most substantial loss of MCC mass is observed within pyrolysis temperature range 300-400 °С. An increase in heating rate during MCC pyrolysis causes a decrease in PCM yield and promotes the development of its porous structure. With pyrolysis temperature range of 400-500 °С, MCC undergoes only paprtial carbonization, while solid products are present in the form of carbon fibres and cellulose clews.
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