Synthesis, characterization and catalytic applications of multifunctional materials based on porphyrin and titanium oxide supported on diatomaceous earth and kaolinite
This work focused on the application of catalysts supported on diatomaceous earth and kaolinite for reactions involving conversion, degradation, and the formation of various compounds. The catalysts were modified using titanium isopropoxide to impregnate kaolinite surfaces with titanium particles, a...
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| Format: | doctoral thesis |
| Publication Date: | 2025 |
| Country: | España |
| Institution: | Universidad Pública de Navarra |
| Repository: | Academica-e. Repositorio Institucional de la Universidad Pública de Navarra |
| OAI Identifier: | oai:academica-e.unavarra.es:2454/55813 |
| Online Access: | https://hdl.handle.net/2454/55813 |
| Access Level: | Embargoed access |
| Keyword: | Supported catalysts Diatomaceous earth Kaolinite Photocatalysis CO2 adsorption |
| Summary: | This work focused on the application of catalysts supported on diatomaceous earth and kaolinite for reactions involving conversion, degradation, and the formation of various compounds. The catalysts were modified using titanium isopropoxide to impregnate kaolinite surfaces with titanium particles, and 3-aminopropyltriethoxysilane (APTES) to functionalize diatomaceous earth, allowing the immobilization of iron porphyrin. These materials were synthesized using the Sol-Gel method and subsequently characterized, along with their respective blanks, to enable comparison at each stage of the process. The first chapter (I) of this work is dedicated to a general introduction to catalysis and its basic concepts, briefly presenting some conventional methods for synthesizing catalysts and the supports used in this study. The next two chapters correspond to studies on the developed catalysts and their applications. In the second chapter (II), the synthesis and characterization of hybrid materials applied to the oxidation of cyclic compounds and the adsorption of carbon dioxide (CO2) are shown. The materials were successful in immobilizing the iron porphyrin by altering the support and were successfully used as catalysts. Additionally, promising results were obtained in CO2 adsorption studies, with a significant adsorption capacity at 100°C in materials functionalized with (3-aminopropyl)triethoxysilane, suggesting a promising versatility of these materials. The third chapter (III) corresponds to studies on Fe2O3-TiO2 particles dispersed in kaolinite, applied as photocatalysts in the synthesis of hydrogen peroxide and the removal of Bisphenol A. Characterizations of these materials revealed that the incorporation of iron and titanium on the surface of the kaolinite improved the photocatalytic properties of titanium, altering its bandgap and achieving high Bisphenol A removal rates. In addition to degradation tests, the generation of hydrogen peroxide from benzyl alcohol was studied, revealing the versatile nature of these catalysts. This was observed both in chapter II and in the materials developed in chapter III. Chapter IV contains the general conclusions inferred from the work presented in this thesis. |
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