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Hogeschool Gent (8)


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book (6)

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Dutch (8)


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2013 (2)

2009 (6)

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Fysicochemie II
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Year: 2009 Publisher: [S.l.] : [s.n.],

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Fysicochemie II / : oefeningen
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Year: 2009 Publisher: [S.l.] : [s.n.],

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Fysicochemie II / : aanvullend leermateriaal
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Year: 2009 Publisher: [S.l.] : [s.n.],

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Fysicochemie I / : oefeningen
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Year: 2009 Publisher: [S.l.] : [s.n.],

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Chemische ingenieurstechnieken I : oefeningen
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Year: 2009 Publisher: [S.l.] : [s.n.],

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Onderzoeksmethodiek
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Year: 2009 Publisher: [S.l.] : [s.n.],

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Dissertation
Verankering van diverse metaalcomplexen op COMOC-4 als heterogene katalysator voor de epoxidatie van cyclische olefinen.
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Year: 2013 Publisher: Gent : [s.n.],

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In deze thesis wordt de synthese van een metaal organisch rooster (MOF), COMOC-4, beschreven. Op deze MOF worden de complexen CuCl2 en MoO2Cl2 verankerd door middel van post-modificatie. Hieruit ontstaan de katalysatoren Cu@COMOC-4 en Mo@COMOC-4. De gefunctionaliseerde MOF’s worden gekarakteriseerd door middel van XRD, DRIFT, XRF, stikstofadsorptie en UV-VIS.Naast een grondige karakterisering, worden bovenstaande katalysatoren Cu@COMOC-4 en Mo@COMOC-4 ook getest in de epoxidatie van de cyclische olefinen: cyclohexeen, cycloocteen en cyclododeceen. Door het gebruik van TBHP als oxidans in de katalytische reacties met Mo@COMOC-4 kan de vorm- en grootteselectiviteit van het substraat onderzocht worden. Tijdens deze katalytische testen worden de drie cyclische olefinen: cyclohexeen, cycloocteen en cyclododeceen geëvalueerd.Voor de katalytische testen met Cu@COMOC-4 wordt dizuurstof als oxidans aangewend en verloopt de katalytische reactie dan ook radicalair. Hierdoor kan de vorm- en grootteselectieve omzetting van het substraat niet worden onderzocht. Cyclohexeen is het substraat in de katalytische testen met Cu@COMOC-4. This thesis describes the synthesis of a Metal Organic Framework, denoted as COMOC-4. The complexes CuCl2 and MoO2Cl2 are anchored on COMOC-4 by a post-modification approach, which results in the catalysts Cu@COMOC-4 and Mo@COMOC-4. The functionalized MOFs are characterized by means of XRD, DRIFT, XRF, nitrogen adsorption and UV-VIS.Cu@COMOC-4 and Mo@COMOC-4 are examined as catalysts in the epoxidation of the cyclic olefins cyclohexene, cyclooctene and cyclododecene. Mo@COMOC-4 was applied as a shape and size selective catalyst. In the catalytic tests, employing Mo@COMOC-4 as a catalyst, tert-butyl hydroperoxide was used as an oxidant. During these catalytic tests the three cyclic olefins: cyclohexene, cyclooctene and cyclododecene are investigated.In the catalytic tests with Cu@COMOC-4, oxygen was employed as an oxidant, which resulted in a radical process. Therefore, the shape and size selectivity cannot be determined. Only the substrate cyclohexene was investigated.

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Dissertation
Zwavelhoudende Periodieke Mesoporeuze Organosilica's voor adsorptie en katalyse.

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Periodic mesoporous silicas are subjected to many changes since their discovery in 1992. One of the major milestones was the integration of organic functions in the structure, which can significantly enhance the properties of the material. In 1999, the first periodic mesoporous organosilica (PMO) was synthesized. An advantage of these PMOs is that all the organic functions are homogeneously distributed throughout the entire material. Due to the large specific surface areas, uniform and large pores, thick pore walls and larger pore volumes, these materials can play a key role in various application fields.This thesis will investigate a sulfur-containing periodic mesoporous organosilica. For the preparation of well-ordered thiol-functionalized PMOs, we first synthesize a precursor with the desired functionality. By using an thiol acid-ene click mechanism, we obtain a 1-thiol-1,2-bis (triethoxysilyl)ethane precursor. The resulting silane and the subsequent thiol-containing PMOs can be characterized by several techniques such as NMR, IR and Raman spectroscopy, nitrogen sorption measurements, XRD and elemental analysis.Thiol-containing materials exhibit a high affinity for mercury(II), and therefore can be used for the adsorption of this heavy metal. These PMO materials possess a high adsorption capacity for mercury(II) ions due to a well-ordered mesostructure and a remarkable high amout of thiol groups. Also, the stability and the regeneration ability of the material, two major factors for the development of a good adsorbent, will be analyzed.After anchoring of sulfonic acid groups on the sulfur-containing PMO, the material can also be used as a solid acid catalyst. The catalytic activity of these sulfonic acid-containing PMO materials are tested in the esterification of acetic acid with 1-propanol. The conversion is compared with the commercial resin Amberlyst-15. Finally, also the leaching and the possible reusability of these catalysts are studied.

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