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

项目负责人：Adhikari， Sushil / Ragauskas， Arthur j提案编号：1333372 / 1333375机构：奥本大学/佐治亚理工学院研究公司标题：合作提案：热处理对生物质结构和使用催化热解工艺生产碳氢化合物的影响生物质转化为热解油（即生物油）并随后升级为汽油和柴油系列化合物在减少美国？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量的生物油。然而，生物油不稳定且呈酸性，含有炭颗粒，其热值约为石油液体燃料的一半。酸性、高粘度、高氧含量、难以去除炭颗粒以及与石油液体的不混溶限制了生物油的使用。催化热解过程可以有效地缓解生物油的一些负面性质。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键的裂解，并产生芳香化合物。焙烧过程已被用于预处理生物质原料，以降低氧含量，并假设通过热解过程可以产生更少的含氧化合物，这些化合物更稳定，具有更高的热值。本研究的中心假设是，热处理导致弱醚键和糖苷键的断裂可以提高生物质热解过程中芳烃的产量。本项目研究热处理对生物质特性及其结构的影响。此外，还研究了形状选择性催化剂中生物质结构与产率的关系。过去对碳化生物质热解的研究主要是研究物化性质对生物油收率的影响，而没有详细了解生物质结构及其对液体产物的影响。此外，虽然Bronsted酸位点在催化热解中的重要性早已被认识，但生物质性质、酸位点数量、热解后烃产物光谱与焦炭形成之间的关系尚不清楚。阐明H+ZSM-5催化剂中酸性（Bronsted）位点在催化热解碳化生物质以最大限度地提高碳氢化合物产量和减少焦炭生成中的作用。这项研究将提供对沸石催化剂上发生的化学反应的基本理解，当热处理-结构损坏-生物质被热解时。生物质衍生的液体燃料有潜力提供具有成本效益和可持续的能源供应，同时达到减少温室气体的目标。该项目的成功完成将对美国农业、林产品和纸浆工业的盈利能力产生影响。该项目将培养以生物能源研究为重点的多学科新一代毕业生，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将涉及k -12年级的教师和学生在这个项目中使用奥本大学现有的基础设施。

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.