当前位置: X-MOL 学术Ind. Crops Prod. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Enhancement of levoglucosan production via fast pyrolysis of sugarcane bagasse by pretreatment with Keggin heteropolyacids
Industrial Crops and Products ( IF 5.9 ) Pub Date : 2020-06-15 , DOI: 10.1016/j.indcrop.2020.112680
Milena Galdino Teixeira , Sarah de Paiva Silva Pereira , Sergio Antonio Fernandes , Márcio José da Silva

In this paper, we report a route to produce levoglucosan (LGA), a biomass-derived platform-molecule that is starting material to obtain various compounds of industrial interest, such as lipids, citric acid, ethanol, 5-hydroxymethylfurfural, furans, aromatic hydrocarbons among other biobased products. Among the several routes to obtain LGA, the fast pyrolysis of lignocellulosic biomass containing glucose monomer has received growing attention due to economic and environmental reasons. In this work, we have developed a new method based on the pretreatment of sugarcane bagasse before the fast pyrolysis with a series of Keggin-type heteropolyacids (i.e., H3PW12O40, H3PMo12O40, and H4SiW12O40), which are solid catalysts easy to handle. Sugarcane bagasse, a biomass waste generated at large scale by food and fuel industries was the feedstock selected. The effects of the main variables of the acid pretreatment such as the nature of the catalyst, time, and temperature of the process were assessed. The efficiency of different pretreatments was examined by the analysis of product distribution obtained from fast pyrolysis. This new method resulted in a significant increase in LGA yield (32 %) as compared to those from pure water pretreated (5 %) and untreated sugarcane bagasse (4 %). Among all the acid catalysts tested, the H3PW12O40 was the most active and selective, due to highest Brønsted acidity strength. The great improvement in LGA yield was attributed to the structural changes in sugarcane bagasse occurred during the acidic pretreatment, which were confirmed by thermal analysis (TG/ DTG) and scanning electron microscopy (SEM) performed before and after the treatment.



中文翻译:

通过用Keggin杂多酸预处理对甘蔗渣进行快速热解来提高左旋葡聚糖的产量

在本文中,我们报告了一种生产左旋葡聚糖(LGA)的途径,左旋葡聚糖(LGA)是一种生物质衍生的平台分子,是获得各种工业感兴趣的化合物的起始原料,例如脂质,柠檬酸,乙醇,5-羟甲基糠醛,呋喃,芳烃碳氢化合物以及其他生物基产品。在获得LGA的几种途径中,由于经济和环境原因,含葡萄糖单体的木质纤维素生物质的快速热解受到越来越多的关注。在这项工作中,我们开发了一种新方法,该方法基于甘蔗渣的预处理,然后使用一系列Keggin型杂多酸(即H 3 PW 12 O 40,H 3 PMo 12 O 40和H4 SiW 12 O 40),它们是易于处理的固体催化剂。选择的原料是甘蔗渣,一种由食品和燃料工业大规模产生的生物质废物。评估了酸预处理的主要变量的影响,例如催化剂的性质,过程的时间和温度。通过分析快速热解获得的产物分布,检查了不同预处理的效率。与来自纯水预处理(5%)和未经处理的甘蔗渣(4%)的LGA产量相比,此新方法显着提高了LGA产量(32%)。在所有测试过的酸催化剂中,H 3 PW 12 O 40由于布朗斯台德酸度强度最高,因此是最活跃和最有选择性的。LGA产量的大幅提高归因于酸性预处理期间甘蔗渣的结构变化,该变化通过处理前后的热分析(TG / DTG)和扫描电子显微镜(SEM)得以证实。

更新日期:2020-06-15
down
wechat
bug