Fast pyrolysis of hot-water-extracted and soda-AQ-delignified okra (Abelmoschus esculentus) and miscanthus (miscanthus x giganteus) stalks by Py-GC/MS

Abstract

Fast pyrolysis of hot-water-extracted and soda-AQ-delignified okra (Abelmoschus esculentus) and miscanthus (miscanthus x giganteus) stalks by Py-GC/MS

Pyrolytic behavior of lignocellulosic-based polysaccharides

“…Most of these pyrolysis products have been detected earlier in related studies after pyrolysis of polysaccharidescontaining samples or polysaccharides, although in different proportions [4-6, 14-17, 23, 29, 51, 56-60]. In our previous pyrolysis studies with birch wood [4] and spruce wood [5] as well as okra and miscanthus [6], there were several pyrolysis products, such as guaiacol, syringyl, naphthalene, and fatty acid derivatives, that originated from lignin and extractives. However, in this back up study, guaiacol and syringyl derivatives were detected only for xylan, indicating that the xylan preparation used contained some minor guaiacyl-syringyl-type lignin impurities.…”

“…It could be noted that, for example, 3-hydroxy-2-penteno-1,5-lactone (lactone) was primarily formed from xylan (also partly from cellulose), 5H-furan-2-one (lactone) from glucomannan (also partly from cellulose), 3-methylcyclopentane-1,2dione (cyclopentenone) from glucomannan, furfural (furan) from cellulose and xylan, and 5-HMF (furan) from cellulose. Based on the our previous studies [4][5][6], of these major pyrolysis products, especially 3-hydroxy-2-penteno-1,5-lactone was produced by a factor of three from hardwood [4] than from softwood [5] indicating the presence of a higher portion of xylan in hardwood. However, its yield from hardwood was still less than that from xylan, probably due to an effect of its integration with cellulose and lignin.…”

“…A decreasing trend of LG formation in untreated and treated softwood samples manifested that it was formed from both glucomannan and cellulose, but more from cellulose. Also 3-methylcyclopentane-1,2-dione and furfural, are Pyrolytic behavior of lignocellulosic-based polysaccharides 127 prominent products from birch wood and spruce wood as well as non-wood [6].…”

“…In our earlier papers, we used pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) for revealing the thermochemical behavior of silver birch [4] and Norway spruce [5] sawdust, as well as non-wood materials, such as okra and miscanthus [6]. In all cases, the effects of pyrolysis conditions on the product distribution were studied.…”

“…In our earlier studies, we investigated the thermochemical behavior of differently treated wood and non-wood materials [4][5][6]. In this comparable study with model substances, firstly, the aim was to further clarify the formation of compound groups under the same pyrolysis conditions as those applied in our previous experiments.…”