A5054501072- Catalytic Processes in Materials Science
- Copper-based nanomaterials and applications
- Electrocatalysts for Energy Conversion
- Catalysis and Oxidation Reactions
- Electronic and Structural Properties of Oxides
- Electron and X-Ray Spectroscopy Techniques
- Graphene research and applications
- Nanomaterials for catalytic reactions
- Advanced Electron Microscopy Techniques and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- History and Developments in Astronomy
- Catalysts for Methane Reforming
- American Environmental and Regional History
- Advanced Photocatalysis Techniques
Zhejiang University
2020-2024
Pd/CeO2 has attracted great attention owing to its unique activity for methane catalytic oxidation; however, the active sites CH4 oxidation still remain elusive, which affects comprehensive understanding of mechanism. In this work, structures PdOx nanoparticles (NPs) loaded on octahedrons, cubes, and rods nanocrystal CeO2 supports were systematically studied by Cs-corrected HRTEM/STEM, XPS, Raman spectroscopy. Our results indicate that Pd species are morphology-dependent: PdO NPs (Pd2+) (x =...
Abstract The reconstruction of rutile TiO 2 (110) holds significant importance as it profoundly influences the surface chemistry and catalytic properties this widely used material in various applications, from photocatalysis to solar energy conversion. Here, we directly observe asymmetric (110)-(1×2) with atomic-resolution using situ spherical aberration-corrected scanning transmission electron microscopy. Density functional theory calculations were employed complement experimental...
Identifying the active phase with highest activity, which is long-believed to be a steady state of catalyst, basis rational design heterogeneous catalysis. In this work, we performed detailed in situ investigations, successfully capturing instantaneous structure–activity change oscillating Pd nanocatalysts during methane oxidation, reveals an unprecedented oscillatory state. Combining quantitative environmental transmission electron microscopy and highly sensitive online mass spectrometry,...
ConspectusHeterogeneous catalysts are widely used in a variety of industrial fields, including environmental protection, energy conversion, and chemical production. Their performance during reactions is usually determined by small fraction sites at the catalyst surfaces/interfaces, namely, active sites. Actually, since concept "active sites" was proposed Hugh Taylor 1920s, determining site atomic level understanding molecular processes that happened have become top priority catalysis...
Understanding the oxidation mechanism of metal nanoparticles under ambient pressure is extremely important to make best use them in a variety applications. Through transmission electron microscopy, we situ investigated dynamic processes Ni at different temperatures atmospheric pressure, and temperature-dependent behavior was revealed. At relatively low temperature (e.g., 600 °C), underwent classic Kirkendall process, accompanied by formation oxide shells. In contrast, higher 800 began with...
Achieving metal nanocrystals with metastable phase draws much attention due to their anticipated fascinating properties, wheras it is still challenging because polymorphism nature and transition mechanism remain elusive. Here, stability of face-centered cubic (fcc) Pd was studied via in situ spherical aberration (Cs)-corrected transmission electron microscopy (TEM). By constructing a well-defined Pd/C composite structure, encapsulated by graphite, the dispersion process fcc observed through...
Abstract Rutile TiO 2 (110)-(1×2) reconstructions have triggered long time debate due to the conflicts among different experimental observations. Here, by combining state-of-the-art in situ spherical aberration corrected scanning transmission electron microscopy and density functional theory calculations, we unravel asymmetric surface reconstruction of rutile (110)-(1×2). We conclude that repulsive electrostatic interaction small polarons, formed excess electrons after removal neutral...