Understanding Catalysts at the Atomic Scale Using In Situ Scanning Transmission Electron Microscopy

使用原位扫描透射电子显微镜在原子尺度上了解催化剂

• 批准号: 1964164
• 金额: --
• 依托单位: University of Manchester
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-1964164
• 关键词: Understanding; Catalysts; Atomic; Scale; Using

Heterogeneous catalysis is a cornerstone of the chemical industry and plays a vital role in improving energy efficiency and reducing unwanted pollutants for a wide range of industrially important chemical reactions. Consequently, the extensive beneficial reach of this process in industry also implicates it in influencing world-wide economic stability.Bimetallic catalysts often show enhanced performance over their monometallic equivalents in many aspects, such as activity, selectivity, and stability. The mechanism behind improved functionality with the addition of a secondary element is generally poorly understood and is further complicated by variations in particle morphologies demonstrating different activities for a given reaction.Working closely with BP Ltd in the development of supported metallic/bimetallic nanoparticle characterization under realistic environmental conditions (elevated temperatures and pressures; gaseous environments), initially, the project will focus on the cobalt oxide (Co-Mn/Ru/Re) for the 'fresh' catalyst and the catalyst after the reduction process (cobalt metal). Ideally, a series of analyses from the fresh catalyst from synthesis to operation (via reduction and reactor start-up steps) would provide a logical progression in understanding the transformation processes. With the use of cutting-edge analytical research methods in correlating the use of STEM with EDS, in situ FTIR spectroscopy, X-ray computation tomography and X-ray absorption spectroscopy, it is hoped that the dramatic improvement in the reaction conversion efficiency by alloying elementary nanoparticles with a secondary metal can be established.

多相催化是化学工业的基石，在提高能源效率和减少工业上重要化学反应的有害污染物方面发挥着至关重要的作用。因此，该工艺在工业上的广泛有益范围也意味着它影响了世界范围的经济稳定性。双金属催化剂通常在许多方面表现出比其单金属等价物更高的性能，例如活性、选择性和稳定性。通过添加第二元素来改善功能性背后的机制通常知之甚少，并且由于颗粒形态的变化而进一步复杂化，这些变化表明对于给定反应具有不同的活性。与BP Ltd密切合作，在实际环境条件下开发负载型金属/纳米颗粒表征在高温高压和气态环境下，该项目最初将重点关注用于“新鲜”催化剂的钴氧化物（Co-Mn/Ru/Re）和还原工艺后的催化剂（钴金属）。理想情况下，对新鲜催化剂从合成到操作（通过还原和反应器启动步骤）的一系列分析将为理解转化过程提供逻辑进展。通过使用尖端的分析研究方法，将STEM的使用与EDS、原位FTIR光谱、X射线计算断层扫描和X射线吸收光谱相关联，希望可以通过将基本纳米颗粒与第二金属合金化来显著提高反应转化效率。