Enhanced levoglucosan production by graphene oxide-catalyzed pyrolysis of biomass

IF 15 2区 环境科学与生态学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Shuai Zhang, Jingjing Ma, Xiangjun Liu, Yayun Ma, Junqi Wang
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Abstract

Pyrolysis of modern biomass is a sustainable technique to produce chemicals, yet efficient and selective conversion remains challenging. We studied biomass pyrolysis catalyzed by graphene oxide for the production of levoglucosan, a chemical with potential applications in biodegradable plastics and surfactants. We tested model compounds containing 40–100 wt% cellulose, poplar biomass, and we modelled the role of graphene oxide by calculations using the density functional theory. Results for model compounds show that levoglucosan production is higher for compounds containing less than 50% cellulose. By contrast, levoglucosan yield are reduced for model compounds having more than 60 wt% cellulose, because graphene oxide induced the breakdown of levoglucosan. Experiments show that pyrolysis of poplar biomass with 5 wt% graphene oxide increased about three times the yield of levoglucosan, compared to non-catalyzed pyrolysis. Enhanced levoglucosan formation is explained by the formation of a six-membered ring intermediate.

Abstract Image

氧化石墨烯催化生物质热解提高左旋葡聚糖产量
现代生物质热解是一种生产化学品的可持续技术,但高效和选择性转化仍具有挑战性。我们研究了在氧化石墨烯催化下生产左旋葡聚糖的生物质热解过程,左旋葡聚糖是一种可用于生物降解塑料和表面活性剂的化学品。我们测试了含有 40-100 wt% 纤维素的杨树生物质模型化合物,并通过密度泛函理论计算模拟了氧化石墨烯的作用。模型化合物的结果表明,纤维素含量低于 50%的化合物左旋葡聚糖产量较高。相比之下,纤维素含量超过 60% 的模型化合物的左旋葡聚糖产量会降低,因为氧化石墨烯会导致左旋葡聚糖分解。实验表明,与非催化热解相比,使用 5 wt% 氧化石墨烯热解杨树生物质可使左旋葡聚糖的产量增加约三倍。六元环中间体的形成解释了左旋葡聚糖形成增强的原因。
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来源期刊
Environmental Chemistry Letters
Environmental Chemistry Letters 环境科学-工程:环境
CiteScore
32.00
自引率
7.00%
发文量
175
审稿时长
2 months
期刊介绍: Environmental Chemistry Letters explores the intersections of geology, chemistry, physics, and biology. Published articles are of paramount importance to the examination of both natural and engineered environments. The journal features original and review articles of exceptional significance, encompassing topics such as the characterization of natural and impacted environments, the behavior, prevention, treatment, and control of mineral, organic, and radioactive pollutants. It also delves into interfacial studies involving diverse media like soil, sediment, water, air, organisms, and food. Additionally, the journal covers green chemistry, environmentally friendly synthetic pathways, alternative fuels, ecotoxicology, risk assessment, environmental processes and modeling, environmental technologies, remediation and control, and environmental analytical chemistry using biomolecular tools and tracers.
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