Collaborative Proposal: Effect of thermal treatment on biomass structure and hydrocarbons production using catalytic pyrolysis process

主要研究者：Adhikari，Sushil / Ragauskas，亚瑟J提案编号：1333372 /1333375机构：奥本大学/格鲁吉亚技术研究公司标题：合作提案：热处理对使用催化热解工艺的生物质结构和烃类生产的影响生物质向热解油的转化（即，生物油）和随后的加氢汽油和柴油范围的化合物有一个显着的潜力，在减少美国？依赖进口石油产品。利用快速热解技术，可以从各种生物质原料中获得高产率的生物油。然而，生物油是不稳定的和酸性的，含有炭颗粒，并且具有石油液体燃料的大约一半的热值。生物油的酸性、高粘度、高含氧量、炭粒难以脱除以及与石油液体的不相容性限制了生物油的应用。已经发现催化热解过程在减轻生物油的一些负面性质方面是有效的。催化过程-使用一些形状选择性沸石-涉及与脱水，脱羧和脱羰基相关的C-C键的断裂，并产生芳香族化合物。烘焙过程已用于预处理生物质原料以降低氧含量，假设结果是更少的氧化化合物，更稳定且具有更高的热值，可以使用热解方法生产。本研究的中心假设是，作为热处理的结果的弱醚键和糖苷键的断裂可以增加生物质热解过程中的芳烃产率。本项目研究热处理对生物质性质及其结构的影响。此外，生物质结构和形状选择性催化剂的烃产率之间的关系将得到阐明。过去的研究已经研究了生物质的物理化学性质对生物油产率的影响，但没有详细了解生物质的结构及其对液体产物的影响。此外，虽然布朗斯台德酸中心对催化热解的重要性已被认识了很长一段时间，生物质性质，酸中心的数量，热解后的烃类产物的光谱，和焦炭形成之间的关系并不清楚。H+ZSM-5催化剂中的酸（Bronsted）位点的作用将在焙烧的生物质的催化热解中阐明，以最大化烃类产量并最小化焦炭形成。这项研究将提供一个基本的了解，发生在沸石催化剂上的化学反应时，热处理-结构损坏-生物质热解，生物质衍生的液体燃料有可能提供一个具有成本效益和可持续的能源供应，同时满足温室气体减排目标。该项目的成功完成将对美国农业，林业产品和纸浆行业的盈利能力产生影响。该项目将培养新一代的毕业生，其多学科重点是生物能源研究，同时在其核心领域提供坚实的基础背景，这将有助于将技术转移到美国工业，从而提高其在能源技术领域的竞争力。作为人类发展过程的一部分，PI将利用奥本大学现有的基础设施，让K-12年级的教师和学生参与该项目。

PI: Adhikari, Sushil / Ragauskas, Arthur JProposal Number: 1333372 / 1333375Institution: Auburn University / Georgia Tech Research CorporationTitle: Collaborative Proposal: Effect of theral treatment on biomass structure and hydrocarbons production using catalytic pyrolysis processmThe conversion of biomass to pyrolysis oil (i.e., bio-oil) and subsequent upgradation to gasoline and diesel range compounds have a significant potential in reducing the United States? dependence on imported petroleum products. Using fast pyrolysis technology, a high yield of bio-oil can be achieved from various biomass feedstocks. However, bio-oil is unstable and acidic, contains char particles, and has about half the heating value of petroleum liquid fuels. Acidity, high viscosity, high oxygen content, difficulties in removing char particles, and immiscibility with petroleum liquids have restricted the use of bio-oil. A catalytic pyrolysis process has been found to be effective in alleviating some of the negative properties of the bio-oil. The catalytic process-- that uses some shape selective zeolites-- involves the cleavage of C-C bonds associated with dehydration, decarboxylation, and decarbonylation, and produces aromatic compounds.Torrefaction process has been used to pretreat biomass feedstocks in order to reduce oxygen content with the assumption that as a result less oxygenated compounds, that are more stable and have higher heating value, can be produced using pyrolysis process. The central hypothesis of this study is that the cleavage of weak ether and glycosidic bonds as a result of thermal treatment can increase aromatics yield in biomass pyrolysis process. This project examines the effects of thermal treatment on biomass properties and its structure. In addition, the relationship between biomass structure and the hydrocarbon yields in shape selective catalysts will be elucidated. Past studies on torrefied biomass pyrolysis have investigated the effect of physicochemical properties on bio-oil yield without developing detailed understanding of biomass structure and its impact on liquid product. In addition, although the importance of Bronsted acid sites on catalytic pyrolysis has been recognized for a long time, the relationship among biomass properties, number of acid sites, spectrum of hydrocarbon products after pyrolysis, and coke formation is not understood. The role of acid (Bronsted) sites in H+ZSM-5 catalyst will be elucidated in catalytic pyrolysis of torrefied biomass to maximize hydrocarbons production and minimize coke formation. This research will provide a fundamental understanding of the chemistry that occurs on the zeolite catalysts when thermally treated --structurally damaged-- biomass is pyrolyzed.Biomass-derived liquid fuels have a potential to provide a cost-effective and sustainable supply of energy, while meeting greenhouse gas reduction targets. The successful completion of this project will have an impact on the profitability of farming, forest products, and pulp industries in the United States. The project will train a new generation of graduates with its multidisciplinary focus on bio-energy research, while providing a solid fundamental background in their core areas, which will help transfer technology to U.S. industry, thereby enhancing its competitiveness in the field of energy technologies. As a part of the human development process, the PI will involve K-12th grade teachers and students in this project using the existing infrastructures at Auburn University.