IR Studies of Carbons. V. Effects of NaCl on Cellulose Pyrolysis and Char Oxidation

摘要

The pyrolysis in vacuum of cellulose containing 5 wt.% of NaCl (NCC) was followed by i.r. photothermal beam deflection spectroscopy, and compared observations made with pure cellulose (PC) Carbon 21, 238 (1938). Although the overall aspects of NCC and PC pyrolysis wer similar, NaCl accelerated the cellulose decomposition, the relative amounts of aliphatic and aromatic residues were changed, and i.r.-detectable species disappeared about 100 C lower than with PC, all implying changes in the decomposition and charring mechnaisms. The reactions of NCC chars with O2 was also followed and compared with those of PC chars. NaCl caused the ratios of oxidation products to change (some band assignments are discussed) but the behavior of NCC chars produced at 650 C, when NaCl evaporated, was similar to high-temperature PC chars.