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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Síntese e caracterização de metaloporfirinas imobilizadas em SBA-15 como catalisadores biomiméticos na oxidação de hidrocarbonetos / \"Synthesis and Characterization of Metalloporphyrins immobilized in SBA-15 as Catalysts at Biomimetic Oxidation of Hydrocarbons\"

Zanatta, Lucas Dimarô 07 March 2014 (has links)
As metaloporfirinas (MeP) cloreto de 5,10,15,20-tetra(pentafluorofenill)porfirina de manganês (III) e ferro (III) (MnIIIP e FeIIIP) foram imobilizadas em matriz de sílica híbrida mesoporosa do tipo SBA-15. Os grupos silanóis da SBA-15 foram modificados com (3-aminopropil)trietoxissilano (APTES) e (3-aminopropil)dietoximetilsilano (APDES), que após a imobilização das metaloporfirinas geraram os catalisadores FeP-APSBA, FeP-APMSBA, MnP-APSBA e MnP-APMSBA. Um terceiro tipo de material foi preparado a partir da ligação de grupos trimetilsilil (TMS) nos catalisadores FeP-APSBA e MnP-APSBA, gerando outros dois catalisadores que foram denominados FeP-APSBA-TMS e MnP-APSBA-TMS. Os materiais foram caracterizados por FTIR, RD UV-Vis, TG/TGA MEV, MET e isotermas de adsorção e dessorção de N2 (BET/BJH). Para analisar a natureza da interação solvente-superfície nos materiais, foram determinadas medidas goniométricas de energia livre de superfície. Os catalisadores foram estudados na oxidação dos substratos (Z)-ciclo-octeno e ciclo-hexano, utilizando iodosilbenzeno (PhIO) como espécie doadora de oxigênio a fim de avalia-los como biomiméticos do citocromo P450. Os parâmetros estruturais foram comparados aos resultados catalíticos frente à formação da gaiola de solvente e das espécies intermediárias de alta valência, FeIV(O)P+. e MnV(O)P e estudar como esses fatores afetam o rendimento e a seletividade das reações catalisadas. As MeP-SBAs apresentaram uma faixa de rendimento de 88 a 47 % para epoxidação de (Z)-ciclo-octeno. Já na oxidação de ciclo-hexano houve formação de 2 a 8 % de ciclo-hexanol e 2 % de ciclo-hexanona. Observou-se maior seletividade para o álcool com as FeP-SBAs. / Manganese (III) and iron (III) 5,10,15,20- tetra(pentafluorophenyl) porphyrin (MnIIIP and FeIIIP ) chloride were immobilized in mesoporous silica hybrid matrix SBA-15. Silanol groups were modified with (3-aminopropyl)triethoxysilane (APTES) and (3-aminopropyl)diethoxymethylsilane (APDES), generating catalysts called FeP-APSBA, FeP-APMSBA, MnP-APSBA and MnP-APMSBA. A third type of material was prepared from the binding trimethylsilyl groups (TMS) in FeP-APSBA and MnP- APSBA catalysts generating the other two catalysts named FeP-APSBA-TMS and MnP-APSBA-TMS. The materials were characterized by FTIR , DR UV-Vis , TG/TGA SEM , TEM and adsorption and desorption isotherms of N2 (BET/BJH) and to analyze the materials solvent - surface interaction nature the were determined goniometric measurements of surface free energy. Catalysts were evaluated for (Z)- cyclooctene and cyclohexane oxidation mediated by iodosylbenzene (PhIO) as the oxygen donor species to evaluate their catalytic activity as cytochrome P450 biomimetics. Structural parameters were compared to catalytic results related to cage solvent formation and the intermediate species high valence FeIV(O)P+. and MnV(O) P and how these factors affect the yield and selectivity of catalysts. MeP-SBA\'s reactions showed a range of 88-47 % for epoxidation (Z)-cyclooctene and cyclohexane oxidation yielding 2 to 8 % of cyclohexanol and 2 % of cyclohexanone. In the latter case was observed a higher selectivity for alcohol with FeP-SBA\'s.
2

Síntese e caracterização de metaloporfirinas imobilizadas em SBA-15 como catalisadores biomiméticos na oxidação de hidrocarbonetos / \"Synthesis and Characterization of Metalloporphyrins immobilized in SBA-15 as Catalysts at Biomimetic Oxidation of Hydrocarbons\"

Lucas Dimarô Zanatta 07 March 2014 (has links)
As metaloporfirinas (MeP) cloreto de 5,10,15,20-tetra(pentafluorofenill)porfirina de manganês (III) e ferro (III) (MnIIIP e FeIIIP) foram imobilizadas em matriz de sílica híbrida mesoporosa do tipo SBA-15. Os grupos silanóis da SBA-15 foram modificados com (3-aminopropil)trietoxissilano (APTES) e (3-aminopropil)dietoximetilsilano (APDES), que após a imobilização das metaloporfirinas geraram os catalisadores FeP-APSBA, FeP-APMSBA, MnP-APSBA e MnP-APMSBA. Um terceiro tipo de material foi preparado a partir da ligação de grupos trimetilsilil (TMS) nos catalisadores FeP-APSBA e MnP-APSBA, gerando outros dois catalisadores que foram denominados FeP-APSBA-TMS e MnP-APSBA-TMS. Os materiais foram caracterizados por FTIR, RD UV-Vis, TG/TGA MEV, MET e isotermas de adsorção e dessorção de N2 (BET/BJH). Para analisar a natureza da interação solvente-superfície nos materiais, foram determinadas medidas goniométricas de energia livre de superfície. Os catalisadores foram estudados na oxidação dos substratos (Z)-ciclo-octeno e ciclo-hexano, utilizando iodosilbenzeno (PhIO) como espécie doadora de oxigênio a fim de avalia-los como biomiméticos do citocromo P450. Os parâmetros estruturais foram comparados aos resultados catalíticos frente à formação da gaiola de solvente e das espécies intermediárias de alta valência, FeIV(O)P+. e MnV(O)P e estudar como esses fatores afetam o rendimento e a seletividade das reações catalisadas. As MeP-SBAs apresentaram uma faixa de rendimento de 88 a 47 % para epoxidação de (Z)-ciclo-octeno. Já na oxidação de ciclo-hexano houve formação de 2 a 8 % de ciclo-hexanol e 2 % de ciclo-hexanona. Observou-se maior seletividade para o álcool com as FeP-SBAs. / Manganese (III) and iron (III) 5,10,15,20- tetra(pentafluorophenyl) porphyrin (MnIIIP and FeIIIP ) chloride were immobilized in mesoporous silica hybrid matrix SBA-15. Silanol groups were modified with (3-aminopropyl)triethoxysilane (APTES) and (3-aminopropyl)diethoxymethylsilane (APDES), generating catalysts called FeP-APSBA, FeP-APMSBA, MnP-APSBA and MnP-APMSBA. A third type of material was prepared from the binding trimethylsilyl groups (TMS) in FeP-APSBA and MnP- APSBA catalysts generating the other two catalysts named FeP-APSBA-TMS and MnP-APSBA-TMS. The materials were characterized by FTIR , DR UV-Vis , TG/TGA SEM , TEM and adsorption and desorption isotherms of N2 (BET/BJH) and to analyze the materials solvent - surface interaction nature the were determined goniometric measurements of surface free energy. Catalysts were evaluated for (Z)- cyclooctene and cyclohexane oxidation mediated by iodosylbenzene (PhIO) as the oxygen donor species to evaluate their catalytic activity as cytochrome P450 biomimetics. Structural parameters were compared to catalytic results related to cage solvent formation and the intermediate species high valence FeIV(O)P+. and MnV(O) P and how these factors affect the yield and selectivity of catalysts. MeP-SBA\'s reactions showed a range of 88-47 % for epoxidation (Z)-cyclooctene and cyclohexane oxidation yielding 2 to 8 % of cyclohexanol and 2 % of cyclohexanone. In the latter case was observed a higher selectivity for alcohol with FeP-SBA\'s.
3

Synthese von Edelmetallclustern auf S-Layern und deren katalytische Eigenschaften / Noble metal cluster synthesis on bacterial surface proteins and catalytic properties

Kirchner, Alexander 28 June 2005 (has links) (PDF)
Bakterielle Zellhüllenproteine (S-Layer) können als formgebende Muster für die bottom-up Materialsynthese Verwendung finden. Auf S-Layern von Bacillus sphaericus und Sporosarcina ureae lassen sich nasschemisch Platin- bzw. Palladiumcluster abscheiden, die sich durch ihren gleichmäßig geringen Durchmesser und ihre hohe laterale Dichte auszeichnen. Am Beginn der vorliegenden Arbeit steht die Charakterisierung des Proteintemplates, welches grundlegenden Einfluss auf die sich bildenden Edelmetallcluster hat. Die Topographie der S-Layeroberfläche wird atomkraftmikroskopisch untersucht. Durch Photoemissions- und NEXAFS-Spektroskopie werden Aussagen zur elektronischen Struktur des Proteins gewonnen, die nach entsprechender Interpretation Erklärungen für das Verhalten des Proteintemplates liefern. Daneben sind Syntheseparameter ausschlaggebend für das Erscheinungsbild des dispersen Metalls. Insbesondere der Einfluss des Reduktionsmittels auf die Clustergröße wird elektronenmikroskopisch und durch Kleinwinkelstreuung untersucht. Die katalytische Aktivität von auf gamma-Al2O3 und SiC immobilisierten metallisierten S-Layern für die Oxidation ausgewählter Kohlenwasserstoffe und Kohlenmonoxid wird bestimmt. Außerdem werden Verfahren zur Erzeugung von Gold- und Silberclustern auf S-Layern vorgestellt.
4

Synthese von Edelmetallclustern auf S-Layern und deren katalytische Eigenschaften

Kirchner, Alexander 18 July 2005 (has links)
Bakterielle Zellhüllenproteine (S-Layer) können als formgebende Muster für die bottom-up Materialsynthese Verwendung finden. Auf S-Layern von Bacillus sphaericus und Sporosarcina ureae lassen sich nasschemisch Platin- bzw. Palladiumcluster abscheiden, die sich durch ihren gleichmäßig geringen Durchmesser und ihre hohe laterale Dichte auszeichnen. Am Beginn der vorliegenden Arbeit steht die Charakterisierung des Proteintemplates, welches grundlegenden Einfluss auf die sich bildenden Edelmetallcluster hat. Die Topographie der S-Layeroberfläche wird atomkraftmikroskopisch untersucht. Durch Photoemissions- und NEXAFS-Spektroskopie werden Aussagen zur elektronischen Struktur des Proteins gewonnen, die nach entsprechender Interpretation Erklärungen für das Verhalten des Proteintemplates liefern. Daneben sind Syntheseparameter ausschlaggebend für das Erscheinungsbild des dispersen Metalls. Insbesondere der Einfluss des Reduktionsmittels auf die Clustergröße wird elektronenmikroskopisch und durch Kleinwinkelstreuung untersucht. Die katalytische Aktivität von auf gamma-Al2O3 und SiC immobilisierten metallisierten S-Layern für die Oxidation ausgewählter Kohlenwasserstoffe und Kohlenmonoxid wird bestimmt. Außerdem werden Verfahren zur Erzeugung von Gold- und Silberclustern auf S-Layern vorgestellt.

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