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Porous Core-Shell Nanostructures for Catalytic Applications.

机译：用于催化应用的多孔核壳纳米结构。

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摘要

Porous core-shell nanostructures have recently received much attention for their enhanced thermal stability. They show great potential in the field of catalysis, as reactant gases can diffuse in and out of the porous shell while the core particle is protected from sintering, a process in which particles coalesce to form larger particles. Sintering is a large problem in industry and is the primary cause of irreversible deactivation.;Despite the obvious advantages of high thermal stability, porous core-shell nanoparticles can be developed to have additional interactive properties from the combination of the core and shell together, rather than just the core particle alone. This dissertation focuses on developing new porous core-shell systems in which both the core and shell take part in catalysis.;Two types of systems are explored; (1) yolk-shell nanostructures with reducible oxide shells formed using the Kirkendall effect and (2) ceramic-based porous oxide shells formed using sol-gel chemistry. Of the Kirkendall-based systems, Au@FexOy and Cu@CoO were synthesized and studied for catalytic applications. Additionally, ZnO was explored as a potential shelling material. Sol-gel work focused on optimizing synthetic methods to allow for coating of small gold particles, which remains a challenge today. Mixed metal oxides were explored as a shelling material to make dual catalysts in which the product of a reaction on the core particle becomes a reactant within the shell.
机译：多孔核-壳纳米结构最近因其增强的热稳定性而备受关注。它们在催化领域显示出巨大的潜力，因为反应气体可以扩散进出多孔壳，同时保护核心颗粒不被烧结，在此过程中，颗粒聚结形成更大的颗粒。烧结是工业中的一个大问题，并且是不可逆失活的主要原因。尽管具有高的热稳定性的明显优势，但可以将多孔的核-壳纳米颗粒开发为具有核和壳结合在一起的其他相互作用特性，而不是不仅仅是核心粒子。本文主要研究开发新型的多孔核-壳系统，其中核和壳都参与催化。 （1）使用柯肯德尔效应形成的可还原氧化物壳的卵黄壳纳米结构，以及（2）使用溶胶-凝胶化学法形成的陶瓷基多孔氧化物壳。在Kirkendall基体系中，合成了Au @ Fe x O y 和Cu @ CoO，并进行了催化应用研究。另外，还研究了ZnO作为潜在的脱壳材料。溶胶-凝胶研究的重点是优化合成方法以允许涂覆小金颗粒，这仍然是当今的挑战。混合金属氧化物被用作脱壳材料，以制备双重催化剂，其中核心颗粒上的反应产物在壳内成为反应物。

著录项

  • 作者

    Ewers, Trevor David.;

  • 作者单位

    University of California, Berkeley.;

  • 授予单位 University of California, Berkeley.;
  • 学科 Chemistry General.;Nanoscience.;Chemistry Inorganic.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 114 p.
  • 总页数 114
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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