Sökning: "metal dispersion"
Visar resultat 11 - 15 av 79 avhandlingar innehållade orden metal dispersion.
11. 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
12. Polyethylene/metal oxide nanocomposites for electrical insulation in future HVDC-cables : probing properties from nano to macro
Sammanfattning : Nanocomposites of polyethylene and metal oxide nanoparticles have shown to be a feasible approachto the next generation of insulation in high voltage direct current cables. In order to reach an operationvoltage of 1 MV new insulation materials with reduced conductivity and increased breakdown strengthas compared to modern low-density polyethylene (LDPE) is needed. LÄS MER
13. Reconstructions of historical metal emissions and their dispersion in the environment
Sammanfattning : A material flow perspective has been applied in the study of the emission, immission and dispersion of heavy metals from three historical point sources in activity during the 18th, 19th and 20th centuries, with the aim of assessing the duration of pollution. The companies studied are Lovers alumworks (1723-1840), Atvidaberg copperworks (1750-1900) and NIFE-Jungner in Fliseryd (1910-1974), all situated in south-eastern Sweden. LÄS MER
14. Surface reactivity, stability, and mobility of metal nanoparticles in aqueous solutions : Influence of natural organic matter and implications on particle dispersion preparation
Sammanfattning : The growing development of nanotechnology has resulted in an increased use of nanoparticles (NPs) in various applications ranging from medicine, military, to daily consumer products. There is a concern that NPs can be dispersed into the environment in various ways, for example to air and water during manufacture, use, incineration or recycling of products and thus pose a risk to health and the environment. LÄS MER
15. Mixed metal oxide - noble metal catalysts for total oxidation of volatile organic compounds and carbon monoxide
Sammanfattning : CO, volatile organic compounds, and polyaromatics areubiquitous air pollutants that give rise to deleterious healthand environmental effects. Such compounds are emitted, forinstance, by the combustion of wood, particularly fromsmall-scale heating appliances. LÄS MER