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Lasersynthese und Funktionalität heterogener Katalysatoren ; Laser synthesis and functionality of heterogeneous catalysts
Catalysis is one of the most important key disciplines to achieve a sustainable future. Despite its significance in chemistry, environmental technology and mobility, there are still numerous open questions related to catalysis. In particular, a targeted catalyst synthesis is crucial in order to control chemical processes in a resource-conserving and sustainable manner. In this sense, the Pulsed Laser Ablation in Liquids (PLAL) technique and the subsequent colloidal particle adsorption to supports is a novel promising approach for the synthesis of ligand-free nanomaterials with high purity for catalytic applications. Yet, to establish this preparation method, deeper insights into the properties of particles as well as their defined settings are necessary. In this thesis, an entire research process from fundamental analysis to application-related investigations is integrated. Since heterogeneous catalysis occurs at the interface of catalysts and reactants, the surface properties of laser-generated, catalytically relevant nanoparticles are investigated in the first part of this thesis. The characteristics of laser-generated platinum and copper nanoparticles were examined, and the results were related to their impact on the formation of alloy nanoparticles, which utilizes combinations of these transition metals. The development of active alloy catalysts is of great importance, since they implement superior properties such as higher catalytic activities as their mono-metals and enable the use of a decreased amount of noble expensive metals. The surface investigations allow a better understanding of underlying synthesis parameters and processes that enables the preparation of well-defined catalytically active materials. By in situ characterization of the surface structure, it was proven that laser-generated platinum nanoparticles are partially oxidized (in case of platinum positively charged) in liquids. While their surface properties are retained after particle deposition, an altered nanoparticle interaction with the ...
Lasersynthese und Funktionalität heterogener Katalysatoren ; Laser synthesis and functionality of heterogeneous catalysts
Catalysis is one of the most important key disciplines to achieve a sustainable future. Despite its significance in chemistry, environmental technology and mobility, there are still numerous open questions related to catalysis. In particular, a targeted catalyst synthesis is crucial in order to control chemical processes in a resource-conserving and sustainable manner. In this sense, the Pulsed Laser Ablation in Liquids (PLAL) technique and the subsequent colloidal particle adsorption to supports is a novel promising approach for the synthesis of ligand-free nanomaterials with high purity for catalytic applications. Yet, to establish this preparation method, deeper insights into the properties of particles as well as their defined settings are necessary. In this thesis, an entire research process from fundamental analysis to application-related investigations is integrated. Since heterogeneous catalysis occurs at the interface of catalysts and reactants, the surface properties of laser-generated, catalytically relevant nanoparticles are investigated in the first part of this thesis. The characteristics of laser-generated platinum and copper nanoparticles were examined, and the results were related to their impact on the formation of alloy nanoparticles, which utilizes combinations of these transition metals. The development of active alloy catalysts is of great importance, since they implement superior properties such as higher catalytic activities as their mono-metals and enable the use of a decreased amount of noble expensive metals. The surface investigations allow a better understanding of underlying synthesis parameters and processes that enables the preparation of well-defined catalytically active materials. By in situ characterization of the surface structure, it was proven that laser-generated platinum nanoparticles are partially oxidized (in case of platinum positively charged) in liquids. While their surface properties are retained after particle deposition, an altered nanoparticle interaction with the ...
Lasersynthese und Funktionalität heterogener Katalysatoren ; Laser synthesis and functionality of heterogeneous catalysts
Marzun, Galina (Autor:in) / Barcikowski, Stephan
24.11.2017
Hochschulschrift
Elektronische Ressource
Englisch
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