Engineering of spinels for catalysis

尖晶石催化工程

• 批准号: RGPIN-2016-04344
• 负责人: Braidy, Nadi
• 金额: $ 2.04万
• 依托单位: Université de Sherbrooke
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=682324
• 关键词: Engineering; spinels; catalysis

The goal of the research program is to develop the technology of microwave or induction field assisted catalysis using magnetic spinels for heterogeneous gas-phase reactions. The innovation is to take advantage of the fact that only the reaction site on the nanoparticles needs to be at higher temperature to improve the efficiency and activity of surface reactions. Such process would enable fast heating to a given regeneration temperature and minimize sintering. The proposed 5-year research project intends to synthesize, characterize and study nanostructures of various spinel ferrites, namely MxFe3-xO4, with M = Ni, Co, Mn, Zn or mixture thereof. Being magnetic and susceptible to microwave, these nanomaterials are being considered as building blocks for producing hybrid nanostructures adapted for assisted catalysis. ***The ferrospinels will be produced using solution-spray thermal plasma, a technique well-established in our lab. The catalytic properties of the ferrospinels are known to be directly related to the affinity of the metals atoms towards specific sites of the spinel crystalline lattice. These metal-site interactions will be investigated using an array of complementary characterization methods, such as X-ray diffraction (XRD), X-ray fluorescence and electron microscopy.***The thermochemistry of these materials will be investigated using operando techniques, allowing the materials to be probed in working conditions to reproduce the behavior of spinels under reaction and design better spinels adapted to selected reactions. Using a gas flow cell, the change of the ferrospinels structure will be probed using operando XRD, X-ray absorption spectroscopy (XAS, at the Canada Light Source, Saskatoon), and thermogravimetry.***With the proposed metal spinels (Mn, Fe, Co, Ni, and Zn) so close in atomic number, finer details of the structure remain hidden from XRD analysis. However, a stronger contrast for these elements is expected if probed with neutron rather than X-rays. Another objective is to design and build an ambient station adapted to the beam line of the Canadian Institute for Neutron Scattering (CINS) in order to gain a comprehensive understanding of the gas/solid and solid-state interactions of these complex spinels during reaction.***The proposed research project is cornerstone to the long-term objective of the lab: the development of technologies based on novel hybrid materials. This research project covers the entire innovation cycle, from the design and synthesis of novel nanomaterials, to the proof of concept of an enabling technology.***The outcome of this research is expected to improve the energy efficiency of catalytic conversion processes by engineering novel nanomaterials and provide training in fields at the crossroads of nanomaterials science, chemical engineering and materials physics.

研究计划的目的是使用磁性尖晶石进行异质气相反应开发微波或感应场辅助催化的技术。创新是要利用一个事实，即只有纳米颗粒上的反应位点才能在较高的温度下以提高表面反应的效率和活性。这种过程将使给定的再生温度快速加热并最大程度地减少烧结。拟议的5年研究项目旨在合成，表征和研究各种尖晶石铁氧体的纳米结构，即MXFE3-XO4，其中M = Ni，Co，MN，MN，Zn或其混合物。这些纳米材料被磁性且容易受到微波的影响，被认为是生产用于辅助催化的混合纳米结构的基础。 ***将使用溶液喷雾热等离子体生产纤维质，这是我们实验室中建立的技术。众所周知，铁纺丝的催化特性与金属原子与尖晶石晶格的特定位点的亲和力直接相关。这些金属位置的相互作用将使用一系列互补表征方法进行研究，例如X射线衍射（XRD），X射线荧光和电子显微镜。*** ***这些材料的热化学将使用Operando技术进行研究，从而可以在工作条件下探测这些材料，从而可以在工作条件下探测出反应和设计反应的行为，以重现反应反应的行为。使用气流电池，将使用Operando XRD，X射线吸收光谱（XAS，在加拿大的光源，萨斯卡通）和热重疗法进行探测Ferrospinels结构的变化。但是，如果用中子而不是X射线探测，则预期这些元素的对比度更强。另一个目的是设计和建立一个适合加拿大中子散射研究所（CINS）的横梁线的环境站，以便对反应过程中这些复杂尖晶石的气/固体和固态相互作用进行全面的了解。该研究项目涵盖了整个创新周期，从新型纳米材料的设计和合成到促成技术的概念的证明。