GOALI: Correlated atomic scale STEM and X-ray synchrotron methods for understanding structure-property relationships of supported nanocluster catalysts

建议编号：CTS-0500511建议编号：CTS-0500511首席研究员：Nigel BrowningInstitution：加州大学戴维斯分校分析(决定的基本原理)：尽管催化是纳米技术最长期的应用，但控制许多反应的复杂机制仍未完全了解。在纳米尺度上设计催化剂的模型的开发为催化剂在制造、能源转换和环境质量方面的使用带来了巨大的希望。由于许多催化剂的重要反应中心与大小从单个原子到几个纳米的金属团簇有关，因此理解催化的关键第一步需要在原子尺度上表征金属团簇的能力。这个GALI项目将使用电子显微镜和同步辐射中的先进技术来确定各种精确合成的催化剂系统中的形状、尺寸分布、成分、化学价态和金属-载体相互作用。这项研究的显微镜方面将利用新开发的仪器，这些仪器特别适合于分析小金属团簇。这些仪器配备了一个空间分辨率将降至0.1纳米以下的像差校正器，一个将光谱分辨率降至0.2 eV以下的单色仪，以及一个允许样品在气态环境下进行三维分析的原位阶段。为了确保这项研究对催化领域具有广泛的适用性，将与埃克森美孚和孟山都这两家工业合作伙伴一起进行。这些合作者将提供样品，就工业规模催化剂的要求提供指导，并在共同建议研究生方面发挥积极作用。通过实习和合作会议，将进一步加强与该项目学生的互动，从而帮助教育下一代科学家将先进的表征技术应用于多相催化研究。这些更广泛的影响是加州大学戴维斯分校一个更大的跨学科计划的一部分：环境、农业和技术中的纳米材料(NEAT)，该计划为纳米科学的所有方面的教育和推广计划提供了重点。

AbstractProposal Title: GOALI: Correlated atomic scale STEM and X-ray synchrotron methods for understanding structure-property relationships of supported nanocluster catalysts Proposal Number: CTS-0500511Principal Investigator: Nigel BrowningInstitution: University of California-DavisAnalysis (rationale for decision):Although catalysis is the longest standing application of nanotechnology, the complex mechanisms controlling many reactions are still not fully understood. The development of models to engineer catalysts on the nanoscale holds great promise for the use of catalysts in manufacturing, energy conversion, and environmental quality. As the important reaction sites for many catalysts are related to metal clusters that range in size from single atoms up to a few nanometers, the key first step in the development of an understanding of catalysis requires the ability to characterize the metal clusters on the atomic scale. This GOALI project will use advanced techniques in both electron microscopy and with synchrotron radiation to determine the shape, size distribution, composition, chemical valence state, and metal-support interactions in a variety of precisely synthesized catalyst systems. The microscopy aspect of this research will make use of newly developed instruments that are particularly suited to the analysis of small metal clusters. These instruments feature an aberration corrector that will take spatial resolution down below 0.1 nm, a monochromator that will take the spectral resolution down below 0.2 eV, and an in-situ stage that will permit samples to be analyzed in 3-D while maintained under a gaseous environment. To ensure that this research has broad applicability to the catalysis community, it will be performed with two industrial partners, ExxonMobil and Monsanto. These collaborators will supply samples, provide guidance on the requirements for industrial-scale catalysts, and play an active role in co-advising the graduate students. This interaction with students on this program will be further enhanced through internships and collaborative meetings, thereby helping to educate the next generation of scientists in the application of advanced characterization techniques to the study of heterogeneous catalysis. These broader impacts are part of a larger interdisciplinary program at UC Davis: Nanomaterials in the Environment, Agriculture, and Technology (NEAT), which provides a focus for education and outreach programs in all aspects of the nanosciences.