In Situ Nanocharacterization of the Synthesis and Early Evolution of Supported Metal and Bimetallic Nanoparticles for Catalytic Applications

摘要提案标题：目标：用于催化应用的负载金属和双金属纳米颗粒的合成和早期演化的原位纳米表征提案号：cts -0553445首席研究员：Peter a . crozier机构：亚利桑那州立大学分析（决策依据）：本研究的目标是对负载金属催化剂合成和早期操作过程中的纳米尺度过程有一个基本的了解。负载型金属催化剂对社会的技术影响是巨大的，关于它们在反应气体条件下的合成和操作，还有许多重要的科学问题尚未得到解答。在许多负载型金属催化剂的合成中，自组装过程在高表面积的载体上创造了金属纳米颗粒的精细分散。本研究将探讨这些自组装过程的步骤，以及近反应器条件下催化剂形态的演变。最先进的原位环境电子显微镜的独特功能将允许在高表面积支撑上直接观察动态纳米级变化。纳米级表面支撑特征（如台阶、边缘位置、表面切面和点缺陷）对金属前驱体分布、分解、扩散以及随后的纳米颗粒成核和生长的作用将被研究。由于溶液浸渍技术广泛应用于工业催化剂的合成，因此研究将重点放在金属颗粒的合成上。实验还将进行，以联系纳米级化学和形态的变化，发生在金属纳米粒子在近反应器条件下。纳米结构的变化将与两种相对简单的与能源生产相关的反应的催化性能相关联：甲烷的部分氧化和水气转换反应。这项工作的广泛技术影响将是重要的，因为从这项研究中获得的信息可以用于开发控制纳米颗粒形成和负载金属催化剂演化的改进方法。本课题所研究的浸渍技术已广泛应用于工业催化剂的生产。将气固反应过程中发生的纳米级变化与催化剂性能相关联，将有助于在分子水平上理解合成-结构-性能之间的关系。拟议的研究将涉及几个更广泛的教育目标。培养理解和掌握现代合成方法、材料纳米表征和催化剂表征的研究生和本科生以及一名博士后。暑期实习职位将提供给来自传统上代表性不足群体的优秀高中生。行业研究科学家的直接参与将为学生提供基础研究与技术发展之间关系的绝佳视角。研究结果将迅速传播给GOALI合作伙伴，通过该研究项目获得的知识也将通过固态科学中心的工业合作项目转移给其他工业公司。

AbstractProposal Title: GOALI: In Situ Nanocharacterization of the Synthesis and Early Evolution of Supported Metal and Bimetallic Nanoparticles for Catalytic Applications Proposal Number: CTS-0553445Principal Investigator: Peter A. CrozierInstitution: Arizona State UniversityAnalysis (rationale for decision):The goal of this research is to develop a fundamental understanding of the nanoscale processes that take place during the synthesis and early operation of supported metal catalysts. The technological impacts of supported metal catalysts on society are enormous, and there are many important scientific questions that remain unanswered concerning their synthesis and operation under reactive gas conditions. In the synthesis of many supported metal catalysts, self-assembly processes create fine dispersions of metal nanoparticles on high surface area supports. This research will investigate the steps in these self-assembly processes and also the evolution of catalyst morphology under near reactor conditions. The unique capabilities of a state-of-the-art in situ environmental electron microscope will allow the dynamic nanoscale changes to be directly observed on high surface area supports. The role of nanoscale surface support features (such as steps, edge sites, surface facets and point defects) on the metal precursor distribution, decomposition, diffusion and subsequent nanoparticle nucleation and growth will be studied. The research will focus on metal particles synthesized using solution impregnation techniques because this approach is widely used for the synthesis of industrial catalysts. Experiments will also be undertaken to correlate the nanoscale chemical and morphological changes that take place on the metal nanoparticles under near reactor conditions. The nanostructural changes will be correlated with catalytic properties for two relatively simple reactions of relevance to energy production: partial oxidation of methane and the water-gas shift reaction.The broader technological impact of the proposed work will be significant because the information obtained from this research can be used to develop improved methods for controlling nanoparticle formation and evolution of supported metal catalysts. The impregnation techniques to be examined in this project are widely used for manufacturing commercial catalysts. Correlating the nanoscale changes that take place during gas-solid reactions with catalyst performance will contribute to a molecular-level understanding of the synthesis-structure-performance relationships. Several broader educational objectives will be addressed by the proposed research. Graduate and undergraduate students and a postdoctoral fellow will be trained in understanding and mastering modern methods of synthesis, materials nanocharacterization and catalyst characterization. Summer intern positions will be offered to outstanding high school students from traditionally underrepresented groups. The direct involvement of industry research scientists in this program will provide the students with an excellent perspective on the relationship between basic research and technology development. The research results will be quickly disseminated to the GOALI partner and the knowledge gained through this research program will also be transferred to other industrial companies through an Industrial Associates Program at the Center for Solid State Science.