Integrated Experimental and Theoretical Endeavor for Fundamental Understanding of Processes in Methane Dehydroaromatization

综合实验和理论研究对甲烷脱氢芳构化过程的基本理解

• 批准号: 2005324
• 负责人: Sheima Khatib
• 金额: $ 50.94万
• 依托单位: Texas Tech University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-09-01 至 2023-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2005324&HistoricalAwards=false
• 关键词: Integrated; Experimental; Theoretical; Endeavor; Fundamental

The West Texas Permian Basin holds trillions of cubic feet of natural gas resources predominantly comprised of methane, which constitutes an economic opportunity in the billions of dollars to upgrade this low-carbon fossil fuel to higher-value fuels and chemicals. The project advances catalytic processing technology that upgrades methane to higher-value chemicals in small plants located at or near the production wells, thus avoiding flaring or costly gas pipeline transport. The catalysts currently employed in this process do not fulfill the activity and stability requirements necessary to make the process economically viable. The study integrates experimental and theoretical methods to better understand the factors limiting current catalyst performance, and uses that knowledge to guide the design of improved catalysts and processing schemes. The project also promotes training of graduate and undergraduate students in technologies related to efficient, cost-effective, and low environmental impact utilization of hydrocarbon resources, while promoting outreach to predominantly minority schools to attract K-12 students to STEM fields.This project targets methane dehydroaromatization (MDA) which constitutes a path for the direct conversion of methane to benzene and hydrogen. Specifically, the project focuses on ZSM-5-supported molybdenum (Mo) catalysts. Previous work by the investigators has revealed that the specific processes by which a ZSM-5-supported Mo oxide precursor is activated to form Mo carbide species strongly affects the catalytic behavior. Thus, Mo-C-support interactions play a pivotal role in achieving the stable formation of aromatics. To further investigate those interactions, model catalysts, with active metals existing only on either the outer surface or within the zeolite channels, will be prepared and evaluated by a suite of experimental and computational tools. The structure, location, and evolution of the Mo species will be monitored by in situ and operando experiments using advanced characterization techniques, including X-ray absorption and high-resolution powder diffraction. The experimental data will be combined with density functional theory calculations to advance knowledge with respect to the structure-activity relationship of the catalysts and the reaction pathways involved in the complete MDA catalytic cycle (activation, reaction, deactivation, regeneration). The combination of kinetic tests, in situ structural characterization, and theoretical calculations will result in the determination of the reaction and deactivation pathways of MDA and will provide the basis for the rational design of catalysts. Beyond the research efforts, the investigators will develop a novel virtual reality (VR) technology module that will allow K-12 students to immerse themselves into a catalyst structure and allow them to directly interact with dynamic 3-D images of the molecules involved in a catalytic process.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

西德克萨斯二叠纪盆地拥有数万亿立方英尺的天然气资源，主要由甲烷组成，这构成了数十亿美元的经济机会，可以将这种低碳化石燃料升级为更高价值的燃料和化学品。 该项目推进了催化加工技术，在位于生产威尔斯井或其附近的小型工厂中将甲烷升级为更高价值的化学品，从而避免了燃烧或昂贵的天然气管道运输。 目前在该方法中使用的催化剂不能满足使该方法经济可行所必需的活性和稳定性要求。该研究整合了实验和理论方法，以更好地了解限制当前催化剂性能的因素，并利用这些知识来指导改进催化剂和加工方案的设计。 该项目还将促进对研究生和本科生进行有关高效、经济、低环境影响的碳氢化合物资源利用技术的培训，同时促进对以少数民族为主的学校的宣传，以吸引K-12学生进入STEM领域。该项目的目标是甲烷脱氢芳构化（MDA），这是甲烷直接转化为苯和氢气的途径。具体而言，该项目侧重于ZSM-5负载的钼（Mo）催化剂。 研究人员先前的工作已经揭示了ZSM-5负载的Mo氧化物前体被活化以形成Mo碳化物物种的特定过程强烈影响催化行为。 因此，Mo-C-载体相互作用在实现芳烃的稳定形成中起着关键作用。 为了进一步研究这些相互作用，模型催化剂，活性金属只存在于外表面或沸石通道内，将制备和评估的一套实验和计算工具。 Mo物种的结构、位置和演变将通过使用先进表征技术（包括X射线吸收和高分辨率粉末衍射）的原位和操作性实验进行监测。 实验数据将与密度泛函理论计算相结合，以推进关于催化剂的结构-活性关系和完整MDA催化循环（活化，反应，失活，再生）中所涉及的反应途径的知识。 动力学测试、原位结构表征和理论计算的结合将导致MDA的反应和失活途径的确定，并将为催化剂的合理设计提供依据。除了研究工作，研究人员将开发一种新的虚拟现实（VR）技术模块，使K-12学生能够沉浸在催化剂结构中，并使他们能够直接与动态3-该奖项反映了NSF的法定使命，并被认为是值得通过使用基金会的智力价值和更广泛的评估支持。影响审查标准。