期刊
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
卷 143, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jaap.2019.104669
关键词
Bagasse; Selective pyrolysis; 4-Vinylphenol; Alkali pretreatment; Ca(OH)(2)
资金
- National Natural Science Foundation of China [51576064, 51821004]
- Beijing Nova Program [Z171100001117064]
- Beijing Natural Science Foundation [3172030]
- Fok Ying Tung Education Foundation [161051]
- Fundamental Research Funds for the Central Universities [2018ZD08, 2017ZZD05]
Herbaceous biomass has been confirmed as a promising renewable source to produce the valuable phenol compound 4-vinylphenol (4-VP) from low temperature fast pyrolysis process. In this work, a novel and simple method was proposed to increase 4-VP production via alkali pretreatment of herbaceous biomass. Three alkali compounds, i.e., Ca(OH)(2), NaOH and Na2CO3, were adopted to pretreat sugarcane bagasse for catalytic fast pyrolysis to selectively produce 4-VP. Pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) experiments were firstly conducted to investigate the effects of alkali type, alkali content, pyrolysis temperature, and pretreatment time on 4-VP formation. Quantitative results of 4-VP yield and selectivity suggested that Ca(OH)(2) was the optimal catalyst for bagasse pretreatment. Under pyrolysis temperature of 280 degrees C with impregnation time of 10 min and Ca(OH)(2) content of 1 wt%, the highest 4-VP yield of 6.37 wt% and selectivity of 58.90% were obtained, compared with the yield and selectivity of 4.28 wt% and 39.95% from raw bagasse. Furthermore, a lab-scale fixed bed reactor was employed for fast pyrolysis of Ca(OH)(2) pretreated bagasse to quantitatively determine the distribution of solid, liquid and gas products. The maximal yield of 4-VP was 6.57 wt% obtained at 310 degrees C. In addition, characterization of Ca(OH)(2) pretreated bagasse samples indicated that alkali pretreatment facilitated the release of 4-VP precursor during the impregnation process.
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