Encapsulation of cobalt complexes in zeolite Y for use as hydroformylation catalysts

 

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dc.contributor.advisor Moss, John en_ZA
dc.contributor.advisor Dry, Mark en_ZA
dc.contributor.advisor O'Connor, Cyril en_ZA
dc.contributor.author Galatolo, Paul Joseph Victor en_ZA
dc.date.accessioned 2016-08-18T13:54:36Z
dc.date.available 2016-08-18T13:54:36Z
dc.date.issued 1997 en_ZA
dc.identifier.citation Galatolo, P. 1997. Encapsulation of cobalt complexes in zeolite Y for use as hydroformylation catalysts. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/21339
dc.description Bibliography: pages 131-138. en_ZA
dc.description.abstract In industry, the hydroformylation reaction is predominantly homogeneously catalysed using carbonyl complexes of cobalt and rhodium (1-3,45). The main disadvantage of homogeneous catalysts is that, especially for the longer chain hydrocarbon systems, very energy-intensive methods (such as distillation) are required to remove them from the reaction products. These separation techniques usually lead to losses of the catalyst. From an economic viewpoint, this is highly undesirable since the catalysts (especially rhodium) are expensive. Research has been carried out on encapsulating the catalysts within the cages of a zeolite, maintaining the activity of the catalyst while allowing it to be easily removed from the reaction medium ( eg. by filtration). However, all research reported so far has only considered rhodium catalysts (1,66-71,87). Furthermore, in most cases, leaching of the rhodium from the zeolite was significant enough to be undesirable. No successful research has been reported on encapsulating cobalt in zeolites for use as a hydroformylation catalyst. In this study, the synthesis of cobalt complexes encapsulated in the supercages of zeolite Y was attempted. The species initially present on the zeolites were analysed by Fourier-Transform Infrared Spectroscopy (FT-IR) and identified by comparison with the IR spectra of pure cobalt complexes synthesised independently in the laboratory. The impregnated catalysts were washed with various solvents to see if the cobalt complex remained in the zeolite. The impregnated zeolites were also tested as hydroformylation catalysts and compared with homogeneous catalysts. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Chemical Engineering en_ZA
dc.title Encapsulation of cobalt complexes in zeolite Y for use as hydroformylation catalysts en_ZA
dc.type Master Thesis
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Engineering and the Built Environment
dc.publisher.department Department of Chemical Engineering en_ZA
dc.type.qualificationlevel Masters
dc.type.qualificationname MSc en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Galatolo, P. J. V. (1997). <i>Encapsulation of cobalt complexes in zeolite Y for use as hydroformylation catalysts</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering. Retrieved from http://hdl.handle.net/11427/21339 en_ZA
dc.identifier.chicagocitation Galatolo, Paul Joseph Victor. <i>"Encapsulation of cobalt complexes in zeolite Y for use as hydroformylation catalysts."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering, 1997. http://hdl.handle.net/11427/21339 en_ZA
dc.identifier.vancouvercitation Galatolo PJV. Encapsulation of cobalt complexes in zeolite Y for use as hydroformylation catalysts. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering, 1997 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/21339 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Galatolo, Paul Joseph Victor AB - In industry, the hydroformylation reaction is predominantly homogeneously catalysed using carbonyl complexes of cobalt and rhodium (1-3,45). The main disadvantage of homogeneous catalysts is that, especially for the longer chain hydrocarbon systems, very energy-intensive methods (such as distillation) are required to remove them from the reaction products. These separation techniques usually lead to losses of the catalyst. From an economic viewpoint, this is highly undesirable since the catalysts (especially rhodium) are expensive. Research has been carried out on encapsulating the catalysts within the cages of a zeolite, maintaining the activity of the catalyst while allowing it to be easily removed from the reaction medium ( eg. by filtration). However, all research reported so far has only considered rhodium catalysts (1,66-71,87). Furthermore, in most cases, leaching of the rhodium from the zeolite was significant enough to be undesirable. No successful research has been reported on encapsulating cobalt in zeolites for use as a hydroformylation catalyst. In this study, the synthesis of cobalt complexes encapsulated in the supercages of zeolite Y was attempted. The species initially present on the zeolites were analysed by Fourier-Transform Infrared Spectroscopy (FT-IR) and identified by comparison with the IR spectra of pure cobalt complexes synthesised independently in the laboratory. The impregnated catalysts were washed with various solvents to see if the cobalt complex remained in the zeolite. The impregnated zeolites were also tested as hydroformylation catalysts and compared with homogeneous catalysts. DA - 1997 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1997 T1 - Encapsulation of cobalt complexes in zeolite Y for use as hydroformylation catalysts TI - Encapsulation of cobalt complexes in zeolite Y for use as hydroformylation catalysts UR - http://hdl.handle.net/11427/21339 ER - en_ZA


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