Sökning: "heterogeneous activity concentration"
Visar resultat 1 - 5 av 18 avhandlingar innehållade orden heterogeneous activity concentration.
1. Multiscale interfacial engineering of heterogeneous electrocatalysts : From structural design to mechanistic study
Sammanfattning : In a typical heterogeneous electrocatalytic reaction, for the given active sites, the electronic structure plays a determining role in electron transfer between the active sites and reactant molecules, which impacts the reaction efficiency. Besides the electronic properties of the electrocatalysts, the reaction interface at which the charge transfer occurs plays an important role in the reaction kinetics. LÄS MER
2. On Weapons Plutonium in the Arctic Environment (Thule, Greenland)
Sammanfattning : This thesis concerns a nuclear accident that occurred in the Thule (Pituffik) area, NW Greenland in 1968, called the Thule accident. Results are based on different analytical techniques, i.e. gamma spectrometry, alpha spectrometry, ICP-MS, SEM with EDX and different sediment models, i. LÄS MER
3. Surface structure and catalytic activity of Pd and Fe oxide surfaces and thin films
Sammanfattning : The present work is devoted to atomic scale structural studies of the surfaces of model heterogeneous catalysts relevant to oxidation reactions. A novel approach using high-energy surface X-ray diffraction combined with mass-spectrometry measurements is employed to perform in situ structural characterization of Pd(100) and Pd(553) single crystal surfaces acting as catalysts in the process of CO oxidation under semirealistic conditions. LÄS MER
4. Operando Single Particle Catalysis - Combining a Nanoreactor and Plasmonic Nanospectroscopy
Sammanfattning : Heterogeneous catalysis is an important cornerstone of modern society with strong ties to the development of sustainable sources of energy and products. Catalysts are typically realized as supported metal nanoparticles that offer active sites that can accelerate chemical reactions by providing energetically more favorable reaction paths. LÄS MER
5. Oxidation and Reconstructions of Alloy Model Catalysts : Platinum-Rhodium and Palladium-Gold
Sammanfattning : Alloys and bimetallic systems have shown many advantages in heterogeneous catalysis, but the details of their catalytic functions are not always known. For instance, the atomic details about surface reconstructions under catalytic reaction conditions, or which phases that are high-active or low-active. LÄS MER
