期刊
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
卷 138, 期 -, 页码 120-131出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jaap.2018.12.015
关键词
Lignin; Catalytic pyrolysis; TGA; TD-GC-MS; Phenols
资金
- Nigerian Tertiary Education Trust Fund (TETFUND)
- Stellenbosch University, South Africa
The structural nature of lignin renders it suitable as a renewable source of phenolic compounds. The production of phenols from pyrolysis of sugarcane lignins with impregnated catalysts was investigated by screening of twelve catalysts (Al2O3, CaO, Fe2O3, TiO2, ZnO, MgO, CuO, MoO3, NiO, Ni/Al2O3-SiO2, NaOH, and KOH) at 1 wt.% content. Sugarcane bagasse lignins were isolated after soda-pulping (SD), soda-anthraquinone-pulping (SAQ) and steam explosion pre-treatment followed by enzymatic hydrolysis (SEH). Pyrolysis was conducted using a thermogravimetric analyser (TGA), and captured volatiles were quantified by thermal desorption (TD) gas chromatography-mass spectroscopy (GC-MS). The TGA results showed that the degradation profiles and char yields were influenced by the presence of catalysts, through modifications in conversion mechanisms. The highest increases in the total yield of phenols were obtained with KOH for SD lignin (+ 25.7%), CaO for SAQ lignin (+ 59.7%), and Fe2O3 for SEH lignin (+ 43.0%). Due to the enhancement of depolymerisation at low temperature (< 350 degrees C), the yields of syringol, guaiacol, and vinylguaiacol increased by 41%, 32%, and 43% for SD lignin, 121%, 93%, and 84% for SAQ lignin, and 72%, 77%, and 54% for SEH lignin respectively. These significant increases in the yields of phenols using 1 wt.% compared to >= 10 wt.% reported in literatures demonstrated the effectiveness of impregnation method.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据