Low-Temperature Deoxidization of Lignin and Its Impact on Liquid Products from Pyrolysis

Type of content
Journal Article
Thesis discipline
Degree name
Publisher
American Chemical Society (ACS)
Journal Title
Journal ISSN
Volume Title
Language
English
Date
2020
Authors
Mei, Y.
Zhang, S.
Wang, H.
Jing, S.
Hou, T.
Pang, Shusheng
Abstract

In this study, low temperature deoxidization of lignin at temperature range of 200~390°C as a pretreatment method had been exploited to gain high quality pyrolysis products. A two-dimensional infrared correlation spectroscopy (2D-PCIS) was used to analyze the evolution of the functional groups of lignin in the process of low temperature deoxidization, and the deoxidized samples were pyrolysed in the pyrolysis gas chromatography mass spectrometry (Py-GC/MS). The results of 2D-PCIS showed that the decomposition of the lignin was accelerated from 320 °C and which was dominated by the elimination reaction. Notably, aromatization reaction was intensified at 350 °C, whereas the structure of lilac aromatic ring was more stable than the guaiac aromatic. It was also found that the alcohol hydroxyl group was significantly removed, and due to this removal other functional groups also underwent changes during the deoxidization. The results from Py-GC/MS experiments showed that deoxidization treatment at lower than 230 °C had insignificant effect on the pyrolysis products. However, when the deoxidization temperature was at 230°C and above, the oxygen-containing compounds in the pyrolysis liquid products (mainly phenols) decreased significantly, and when the deoxidization temperature was above 290 °C, hydrocarbons were the main compounds in the pyrolysis liquid product.

Description
Citation
Mei Y, Zhang S, Wang H, Jing S, Hou T, Pang S Low-Temperature Deoxidization of Lignin and Its Impact on Liquid Products from Pyrolysis. Energy & Fuels.
Keywords
Lignin, Pretreatment, Deoxidization, 2D-PCIS, Pyrolysis
Ngā upoko tukutuku/Māori subject headings
ANZSRC fields of research
Fields of Research::40 - Engineering::4004 - Chemical engineering::400402 - Chemical and thermal processes in energy and combustion
Fields of Research::30 - Agricultural, veterinary and food sciences::3007 - Forestry sciences::300705 - Forestry biomass and bioproducts
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