权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Production of Renewable Acrylic Acid via Catalytic Dehydration of Lactic Acid: Mechanistic Studies and Catalysts Design

通过乳酸催化脱水生产可再生丙烯酸：机理研究和催化剂设计

基本信息

批准号：
1437129
负责人：
Bingjun Xu
金额：
$ 30万
依托单位：
University of Delaware
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2014
资助国家：
美国
起止时间：
2014-11-01 至 2018-10-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1437129&HistoricalAwards=false
关键词：
Production Renewable Acrylic Acid via

项目摘要

Abstract Title: Production of green polymer precursors from biomass through catalytic dehydration of lactic acid to acrylic acidAs environmental concerns and the price of hydrocarbon-derived feedstocks and intermediates escalate on a continuing basis, the shift of the production of fuels and chemicals from fossil to renewable carbon sources not only makes economic sense due to price volatility and dwindling reserve of crude oil, but also is highly desirable from the environmental perspective by effectively reducing some CO2 emissions. Acrylic acid and its esters are key precursors in the polymer industry, with an annual demand of 4 million metric tons. They are currently produced through an energy intensive crude oil-based process. In addition, the explosive growth of natural gas production has led to a sudden increase in the use of natural gas relative to crude oil as a carbon source, has created significant gaps between the production capacity and demand of many key chemicals including propylene, the raw material for acrylic acid production. Fortunately, recent progress in the field of biomass conversion has made the production of various chemicals, such as renewable lactic acid, from biomass technologically feasible and economically competitive. Professor Bingjun Xu at the University of Delaware, proposes to develop the fundamental understanding to formulate a process for using this lactic acid as a green precursor to make acrylic acid. This award supports the research needed to answer the challenges of a shift to renewable, biomass-derived feedstocks. Production of acrylic acid from lactic acid via catalytic dehydration is potentially more selective compared to the current industrial route due to the structural similarity of lactic and acrylic acids. In contrast to the current industrial process, which requires several selective oxidation steps starting from propylene, only one dehydration step is needed to convert lactic acid to acrylic acid. Thus catalysts and reaction condition can be optimized for a single step rather than many reactions, which typically occur on different type of active sites and reach optimal performance under different conditions. In addition, it is generally easier to control selectivities in dehydration than partial oxidation reactions, since total oxidation is typically more thermodynamically favored than partial oxidation reactions. The proposed work aims at rationally designing efficient catalysts to facilitate the conversion of lactic acid to acrylic acid through a combination of reactivity evaluations, materials synthesis and spectroscopic investigations. The study of catalytic dehydration of lactic acid to acrylic acid will also provide fundamental insights into the interaction and selective activation of bi- or multi-functional molecules, a group to which most biomass-derived molecules belong, with catalytic active sites. Thus, the mechanistic insights gained in the proposed research could lead to guiding principles for tailoring active sites of catalysts, not only for the specific reaction of dehydration of lactic acid, but also for a broad range of other chemical transformations involving multifunctional biomass-derived molecules.

摘要标题:由于环境问题和碳氢化合物衍生原料和中间体的价格持续上涨，燃料和化学品生产从化石转向可再生碳源不仅具有经济意义，因为价格波动和原油储备减少，而且从环境的角度来看，通过有效地减少一些二氧化碳的排放也是非常可取的。丙烯酸及其酯是聚合物工业的关键前体，年需求量为400万吨。目前，它们是通过能源密集型的原油生产工艺生产的。此外，天然气产量的爆炸性增长导致天然气相对于原油作为碳源的使用量突然增加，造成了包括丙烯（丙烯酸生产的原料）在内的许多关键化学品的产能和需求之间的显著差距。幸运的是，最近生物质转化领域的进展使得从生物质中生产各种化学品，如可再生乳酸，在技术上是可行的，在经济上是有竞争力的。特拉华大学（University of Delaware）的徐炳军（Bingjun Xu，音译）教授建议，开发一种基本的理解，制定一种使用这种乳酸作为绿色前体来制造丙烯酸的工艺。该奖项支持应对向可再生生物质原料转变的挑战所需的研究。由于乳酸和丙烯酸的结构相似，与目前的工业路线相比，通过催化脱水从乳酸中生产丙烯酸可能更具选择性。与目前的工业工艺相比，从丙烯开始需要几个选择性氧化步骤，将乳酸转化为丙烯酸只需要一个脱水步骤。因此，催化剂和反应条件可以针对单个步骤而不是多个反应进行优化，这些反应通常发生在不同类型的活性位点上，并在不同的条件下达到最佳性能。此外，在脱水反应中通常比部分氧化反应更容易控制选择性，因为总的氧化反应通常比部分氧化反应在热力学上更有利。本工作旨在通过反应性评价、材料合成和光谱研究相结合，合理设计高效催化剂，促进乳酸转化为丙烯酸。乳酸催化脱水制丙烯酸的研究也将为双或多功能分子的相互作用和选择性活化提供基本的见解，这是大多数生物质衍生分子所属的一类具有催化活性位点的分子。因此，在拟议的研究中获得的机制见解可以为定制催化剂活性位点提供指导原则，不仅适用于乳酸脱水的特定反应，还适用于涉及多功能生物质衍生分子的广泛其他化学转化。