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Production of phenolic compounds in catalytic pyrolysis of bagasse lignin in the presence of Ca0.5Pr0.5FeO3
Journal of Rare Earths ( IF 4.9 ) Pub Date : 2021-02-27 , DOI: 10.1016/j.jre.2021.02.014
Hongjing Han , Qin Ge , Mei Zhang , Yanguang Chen , Haiying Wang , Yanan Zhang , Yizhen Wang , Hua Song , Chunlei Zhang

Herein, sodium dodecylbenzene sulfonate (SDBS) was used as a template to control the synthesis of Ca0.5Pr0.5FeO3. Its microstructure, composition, and morphology were detected via X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). The properties of catalyzing bagasse lignin (BL) pyrolysis were determined by thermogravimetric analysis (TG) test and evaluation of a fixed bed alumina microreactor. The results show that the sample Ca0.5Pr0.5FeO3 regulated by SDBS has a cubic crystal phase, and the addition of SDBS does not cause phase transition. Moreover, when the SDBS concentration is 0.10 mol/L, the particle size is 200–500 nm and the specific surface area is 11.26 m2/g. The yields of gas, liquid, and solid products in the BL catalytic pyrolysis are 39.58 wt%, 26.76 wt% and 32.36 wt%, respectively. The contents of CO2 and CO decrease from 54.07% and 4.98% to 45.29% and 3.23%, respectively. The liquid products are mainly guaiacol, syringol, and phenol, and the total selectivity of phenols is 83.67%, accompanied by a small amount of non-aromatic oxygen-containing compounds (five-membered ring (furan) or ester). Compared with the BL pyrolysis and Ca0.5Pr0.5FeO3 catalytic pyrolysis products, the selectivity of guaiacol compounds increases by 43.26%, while those of syringol compounds and phenylketones decrease by 30.08% and 3.39%, respectively. The selectivity of 2,6-dimethoxyphenol is 28.37%. After five catalytic pyrolysis-regeneration cycles, the characteristic peaks of the catalyst do not change significantly and the particles are uniform, suggesting that the catalyst has good crystal phase stability and regeneration stability.



中文翻译:

Ca0.5Pr0.5FeO3存在下甘蔗渣木质素催化热解生产酚类化合物

本文以十二烷基苯磺酸钠(SDBS)为模板控制Ca 0.5 Pr 0.5 FeO 3的合成。通过 X 射线衍射 (XRD)、傅里叶变换红外光谱 (FT-IR) 和扫描电子显微镜 (SEM) 对其微观结构、组成和形貌进行了检测。通过热重分析(TG)测试和固定床氧化铝微反应器的评估确定了催化甘蔗渣木质素(BL)热解的性质。结果表明样品Ca 0.5 Pr 0.5 FeO 3SDBS调节的晶相为立方晶相,添加SDBS不会引起相变。此外,当SDBS浓度为0.10 mol/L时,粒径为200~500 nm,比表面积为11.26 m 2 /g。BL催化热解中气体、液体和固体产物的产率分别为39.58 wt%、26.76 wt%和32.36 wt%。CO 2和CO的含量分别从54.07%和4.98%下降到45.29%和3.23%。液体产物主要为愈创木酚、紫丁香酚和苯酚,苯酚总选择性为83.67%,并伴有少量非芳香族含氧化合物(五元环(呋喃)或酯)。与BL热解和Ca 0.5 Pr 0.5 FeO 3比较催化裂解产物,愈创木酚类化合物的选择性提高43.26%,紫丁香醇类化合物和苯酮类化合物的选择性分别降低30.08%和3.39%。2,6-二甲氧基苯酚的选择性为28.37%。经过5次催化热解-再生循环后,催化剂的特征峰没有明显变化,颗粒均匀,表明催化剂具有良好的晶相稳定性和再生稳定性。

更新日期:2021-02-27
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