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：原位纳米表征催化应用中负载金属和双金属纳米颗粒的合成和早期演变提案编号：CTS-0553445主要研究者： 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型金属催化剂的合成和早期操作过程中发生的纳米级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，并且关于它们在反应性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载体上产生金属纳米颗粒的精细分散体。本研究将探讨这些自组装过程中的步骤，以及在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持物上直接观察动态纳米级变化。纳米级表面支持功能（如步骤，边缘网站，表面刻面和点缺陷）上的金属前体分布，分解，扩散和随后的纳米粒子成核和生长的作用将被研究。研究将集中在使用溶液浸渍技术合成的金属颗粒上，因为这种方法广泛用于工业催化剂的合成。实验也将进行相关的纳米级的化学和形态的变化，发生在金属纳米粒子在近反应器的条件下。纳米结构的变化将与催化性能的两个相对简单的反应相关的能源production. The甲烷的部分氧化和水煤气变换reaction.The更广泛的技术影响，拟议的工作将是显着的，因为从这项研究中获得的信息可以用来开发改进的方法控制纳米粒子的形成和演变的负载型金属催化剂。本项目所考察的浸渍技术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联系起来，将有助于从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。研究生和本科生以及博士后研究员将接受培训，了解和掌握现代合成方法，材料纳米表征和催化剂表征。 暑期实习生职位将提供给来自传统上代表性不足的群体的优秀高中生。工业研究科学家直接参与该计划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，通过该研究计划获得的知识也将通过固态科学中心的工业协会计划转移到其他工业公司。

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.