CBET: A two step chemocatalytic conversion of cellulosic biomass to hydrocarbon biofuels

CBET：纤维素生物质向碳氢化合物生物燃料的两步化学催化转化

基本信息

批准号：
1704144
负责人：
Ananda Amarasekara
金额：
$ 31.5万
依托单位：
Prairie View A & M University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-09-01 至 2023-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1704144&HistoricalAwards=false
关键词：
CBET two step chemocatalytic conversion

项目摘要

The long-term security of our economy requires a portfolio of domestic feedstocks to produce fuels and chemicals. Biomass is a promising choice; however, conversion technologies that are reliable, reproducible and economic are still needed. This project addresses fundamental knowledge supporting a conversion technology uses resources that are targeted solely for fuels production. This project addresses direct conversion of lignocellulosic biomass into a bio-oil that has the potential to be a drop-in replacement for gasoline and other fuels. These fuels would be applicable in current automotive internal combustion engines and for air transportation. The project researches a novel catalyst that serves three functions to break up the biomass structure of cellulose, hemicellulose, and lignin into smaller chemical entities that are converted into a fuel mixture. The catalyst mixture is recyclable and readily recovered from the product mixture. Potential savings are gained in a simpler 2-step process, recycling of catalyst, and higher yield of product from the feedstock. The resulting product would be stable and have high energy content to mix into existing fuel stockpiles. The project's educational activities stress undergraduate research and outreach to high school students for participation in STEM careers.The objective of the project is to research an energy efficient recyclable two step catalytic process for the transformation of biomass to next generation hydrocarbon biofuels. This goal will be achieved by the design of a recyclable catalyst that can produce C5-C20 range partially oxygenated furanic alkene type biocrude oil from lignocellulosic biomass in a single reactor operation under mild conditions. In the first conversion step, cellulose and hemicelluloses in the biomass undergoes an acidic ionic liquid catalyzed depolymerization to glucose and xylose at a relatively low temperature. In the next stage the catalyst will dehydrate the monosaccharides into a furan mixture, 5-hydroxymethylfurfural and furfural. In the final reaction step, the furan aldehydes will undergo acid catalyzed aldol condensation with acetone in the medium. The complex product will consist of C5-C20 range compounds resulting from cross aldol condensation between biomass derived furans and acetone, as well as acetone self-condensation products. The biocrude produced by this catalytic process is stable and composed of well-defined stable furanic alkene and enone products, which are then upgraded to hydrocarbons using established catalytic reduction technology.

我们经济的长期安全要求国内原料组合生产燃料和化学物质。生物质是一个有前途的选择；但是，仍然需要可靠，可再现和经济的转换技术。该项目解决了支持转换技术的基本知识，使用仅针对燃料生产的资源。该项目介绍了木质纤维素生物量直接转化为生物油，有可能替代汽油和其他燃料。这些燃料将适用于当前汽车内燃机和航空运输。该项目研究了一种新型的催化剂，该催化剂具有三种功能，以将纤维素，半纤维素和木质素的生物量结构分解为被转化为燃料混合物的较小化学实体。催化剂混合物是可回收的，并且很容易从产品混合物中回收。潜在的节省在更简单的两步过程中，催化剂的回收利用和原料产物产量更高。最终的产品将是稳定的，并且具有高能量含量，可以混合到现有的燃料库存中。该项目的教育活动强调本科生的研究并向高中生参与STEM职业。该项目的目的是研究可节能的可回收两步催化过程，以将生物量转化为下一代碳氢化合物生物料。该目标将通过设计可回收催化剂的设计来实现，该催化剂可以在轻度条件下单个反应器操作中从木质纤维素生物量中部分氧化的Furanic Alkene型生物碱性油。在第一个转换步骤中，生物质中的纤维素和半纤维素经历酸性离子液体在相对较低的温度下催化葡萄糖和木糖的催化性离子液体。在下一阶段，催化剂会将单糖脱水成呋喃混合物，5-羟甲基曲面和毛茸茸。在最后的反应步骤中，呋喃醛将在培养基中与丙酮催化酸催化醛降解。复杂的产物将由由生物质衍生的Furans和丙酮以及丙酮自构敏产物之间的跨藻凝结产生的C5-C20范围化合物组成。这种催化过程产生的生物乳腺素是稳定的，由定义明确的稳定呋喃烯烃和烯烯型产品组成，然后使用已建立的催化还原技术升级为碳氢化合物。