Search for dissertations about: "XPS analysis"

Showing result 1 - 5 of 77 swedish dissertations containing the words XPS analysis.

2. 1. Ring-opening catalysts for cetane improvement of diesel fuels

   Author : Ulf Nylén; Magali Boutonnet; Sven Järås; François Garin; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ring opening selective ; naphthenic structure; indan; light cycle oil LCO ; cetane; Pt-Ir catalyst; microemulsion; XPS; TPR; TEM; DRIFTS; sulphur analysis; GC-SCD; Chemical engineering; Kemiteknik;

   Abstract : The global oil refining industry with its present product distribution essentially shifted towards fuels such as gasoline and diesel will most likely hold the fort for considerable time. However, conditions are changing and refinery survival will very much depend on long-term planning, process and product flexibility and being at the frontiers of refining technology, a technology where catalysts play leading roles. READ MORE

4. 2. Low-temperature carburizing/nitriding of austenitic stainless steels - Influence of alloy composition on microstructure and properties

   Author : Giulio Maistro; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; tribology; surface engineering; S-phase; SEM; corrosion; XPS; Austenitic stainless steel; expanded austenite; plasma nitriding; EBSD; XRD; thermal stability; low-temperature carburizing; surface analysis; GDOES;

   Abstract : Austenitic stainless steels are among the most used materials in applications where corrosion resistance is important, as the food, pharmaceutical, chemical, oil and gas industries. However, low hardness and poor tribological properties is often an obstacle for their applicability. READ MORE

5. 3. Oxide Formation and Degradation during Erosion-Corrosion of Iron and Nickel Based Alloys

   Author : Rikard Norling; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; AES; fluidised bed; FBC; XPS; erosion-corrosion; SO2; crack formation; surface analysis; HCl; enhanced oxidation;

   Abstract : Erosion-corrosion is, in many technical applications, a serious material degradation process caused by dynamic particle/fluid mixtures. Pipes transporting particle containing liquids, jet engines, gas turbines, and fluidised bed combustion (FBC) power plants are examples of systems which are considered to be especially susceptible. READ MORE

6. 4. Properties of Asphaltenes with emphasis on NMR self-diffusion as the investigating technique

   Author : Jenny-Ann Östlund; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; amphiphilic; diffusion; oil; mixture analysis; CORE; stability; NMR; pulsed gradient spin echo; light scattering; XPS; asphaltene; chemical interactions;

   Abstract : Asphaltenes are high-molecular weight, highly aromatic molecules that have a strong tendency to aggregate. Asphaltenes are found in oil and may, if they form particles, cause problems during oil production and handling. READ MORE

7. 5. ROLE OF SURFACE OXIDES IN SINTERING OF CHROMIUM-ALLOYED STEEL POWDER

   Author : Henrik Karlsson; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; water atomisation; surface analysis; sintering; chromium-alloyed steel.; Powder metallurgy; surface reactions; surface; surface oxide; SEM; XRD; AES; XPS;

   Abstract : During water-atomisation and handling of steel powder the surface inevitably oxidises. The surface bound oxide is an important factor in the processing of powder metallurgical (PM) steels, especially in case the powder contains elements forming stable oxides, such as Cr, Mn, and Si. READ MORE