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Visar resultat 1 - 5 av 44 avhandlingar som matchar ovanstående sökkriterier.
1. On the use of periodic operation for improvning chemical processes
Sammanfattning : In this thesis, some methods of improving the product distribution from chemical processes are compared. The first two parts contain an experimental investigation of how the product distribution of a process is influenced by the choice of catalyst. LÄS MER
2. Twist-Symmetric Periodic Structures : Properties and Applications
Sammanfattning : In this thesis, periodic structures with higher symmetries symmetries are discussed. The main focus of the thesis is on twist symmetries. Importantly, the attractive properties of twist symmetries for the control of electromagnetic wave propagation are demonstrated. LÄS MER
3. Periodic Structures with Higher Symmetries: Analysis and Applications
Sammanfattning : In this thesis, periodic structures with higher symmetries are studied. Their wave propagation characteristics are investigated and their potential applications are discussed. Higher-symmetric periodic structures are described with an additional geometrical operation beyond a translation operator. LÄS MER
4. Transient Phenomena in CO and Hydrocarbon Oxidation over Supported Platinum Catalysts
Sammanfattning : The aim with this thesis work was to better understand transient phenomena involved in the low-temperature oxidation of CO and hydrocarbons by oxygen over typical oxidation catalysts. Supported platinum catalysts were prepared and carefully studied under transient conditions by means of flow-reactor experiments, different in situ spectroscopic (FTIR and XANES) methods in combination with mass spectrometry and mean-field kinetics simulations. LÄS MER
5. Interaction of CO and methane with platinum, Low-temperature oxidation and sensor response mechanisms
Sammanfattning : The aim of this thesis project was to increase the understanding of the mechanisms for low-temperature oxidation of carbon monoxide and methane over supported platinum catalysts. In situ spectroscopic methods together with mass spectrometry were used to study the catalysts during both steady state and transient conditions. LÄS MER