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Visar resultat 1 - 5 av 27 avhandlingar som matchar ovanstående sökkriterier.
1. In situ structural studies and gas phase visualization of model catalysts at work
Sammanfattning : This thesis reports on in situ structural studies relevant to a catalytic surface during CO oxidation. The materials that have been studied are palladium, rhodium and an alloy of palladium and silver, with applications in emission cleaning by catalytic converters in vehicles. LÄS MER
2. Development and Assessment of Regeneration Methods for Commercial Automotive Three-Way Catalysts
Sammanfattning : Car exhaust catalysts were introduced in the early 1980’s, to limit the release of pollutants such as hydrocarbons, carbon monoxide and nitrogen oxides. These catalysts contain noble metals such as palladium (Pd), platinum (Pt) and rhodium (Rh) and are able to simultaneously abate all three of the above-mentioned pollutants, hence the name three-way catalyst (TWC). LÄS MER
3. Hydrogen Generation for Fuel Cells in Auxiliary Power Systems
Sammanfattning : Heavy-duty trucks are in idle operation during long periods of time, providing the vehicles with electricity via the alternator at standstill. Idling trucks contribute to large amounts of emissions and high fuel consumption as a result of the low efficiency from fuel to electricity. LÄS MER
4. The effect of surface steps and oxides on the catalytic activity on model Pd and Rh catalysts
Sammanfattning : A catalyst is a substance that can speed up the rate of a chemical reaction without itself being consumed. Catalysts are crucial for chemical production industries, where about 90% of all chemicals are produced using catalysts. LÄS MER
5. Model catalysts studied by x-rays, visible and infrared light
Sammanfattning : This work is focused on the study of transition metal model catalysts for gas-phase heterogeneous catalysis, studied with light-based in-situ and operando techniques.Metallic model catalysts, such as Palladium (Pd) and Iridium (Ir) single crystals and in minor part deposited Rhodium (Rh), were studied using a combination of x-ray and non x-ray techniques. LÄS MER