Sökning: "model catalysts"

Visar resultat 1 - 5 av 196 avhandlingar innehållade orden model catalysts.

1. 1. Compound Formation in Model Catalysts

   Författare :Rasmus Westerström; Synkrotronljusfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fysicumarkivet A:2010:Westerström;

   Sammanfattning : In this thesis we have performed a systematic atomic scale characterization of model catalysts under pressures ranging from UHV to atmospheric ambient. By using a unique approach, linking UHV and high pressures studies by combining traditional electron based techniques with novel high pressure in situ probes and ab initio calculations, the surface structure of the different model catalysts could be determined under a wide range of conditions, spanning more than ten orders of magnitude in pressure. LÄS MER

3. 2. In situ structural studies and gas phase visualization of model catalysts at work

   Författare :Sara Blomberg; Synkrotronljusfysik; []
   Nyckelord :CO-oxidation; model catalysts; AP-XPS; PLIF; Pd; Rh; PdAg; Fysicumarkivet A:2017:Blomberg;

   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

4. 3. Nanostructured Fuel Cell Catalysts

   Författare :Marie Gustavsson; Chalmers tekniska högskola; []
   Nyckelord :Nafion; thin film evaporation; model catalyst; electrocatalyst; acetic acid oxidation; oxygen reduction; colloidal lithography; PEMFC; screening; Pt; formaldehyde oxidation; methanol oxidation; nanofabrication; CO oxidation; polymer electrolyte; TiOx;

   Sammanfattning : A long term challenge for society is to develop sustainable energy systems to reduce the dependence on fossil fuels and to decrease air pollution. This requires new alternatives regarding the supply of energy and increased efficiency of the future energy systems. Fuel cell technology is one such possible alternative. LÄS MER

5. 4. Model studies with nanofabricated and traditional supported catalysts

   Författare :Stefan Johansson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; model catalyst; catalysis; electron-beam litography; micro-reactor; PdO; nanofabrication; hysteresis;

   Sammanfattning : .... LÄS MER

7. 5. Self-adaptable catalysts : Importance of flexibility and applications in asymmetric catalysis

   Författare :Ester Fjellander; Christina Moberg; Jay Siegel; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; adaptable; flexible; semi-flexible; symmetry; conformational study; mechanistic study; rotation barrier; VT NMR; asymmetric catalysis; ligand design; allylic alkylation; hydrogenation; azepines; dioxaphosphepines; phosphepines; amines; phosphines; phosphoramidites; phosphinites; palladium; rhodium; Organic chemistry; Organisk kemi;

   Sammanfattning : The topic of this thesis is the design and synthesis of biaryl-based self adaptableligands for asymmetric metal catalysis. The results discussed in papers I-III are covered, together with some unpublished results concerning substrate-adaptable catalysts. A general survey of self-adaptable catalysts is presented first. LÄS MER