Use this URL to cite or link to this record in EThOS: | http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.486059 |
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Title: | Heterogenizing homogeneous hydrogenation catalysts | ||||
Author: | Craythorne, Steven James |
ISNI:
0000 0001 3396 2482
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Awarding Body: | Queen's University Belfast | ||||
Current Institution: | Queen's University Belfast | ||||
Date of Award: | 2007 | ||||
Availability of Full Text: |
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Abstract: | |||||
Catalysts frequently used in the fine chemical industries are qften homogeneous, therefore requiring
expensive and time consuming methods of catalyst regeneration. The loss of expensive transition
metals used in most homogeneous catalysts is significant, and further tests must be conducted to
measure levels of contamination of the final product, a critical consideration in the phannaceutical
and foodstuffs industries.
This thesis reports the synthesis, material preparation and testing of three methods of entrapping
active catalysts. The methods described have been developed to fulfill the conditions suitable for the
individual catalyst. Acidic, basic and fast gelling sol-gel techniques are discussed in which silica
based glasses, ionogels and organogels are functionalized with active catalyst species. These
cat~lysts have undergone the hydrogenation of styrene, the enantioselective hydrogenation of
geraniol and the transfer hydrogenation ofacetophenone.
We report the results of catalytic reactions employing these heterogenized homogenous catalysts
comparable in selectivity and conversion to their homogeneous counterparts, yet having ease of
separation. and effortless handling conditions equivalent to and (in some cases) better than
corresponding heterogeneous catalysts. We also report the negligible metal leaching in our catalyst systems.
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Supervisor: | Not available | Sponsor: | Not available | ||
Qualification Name: | Thesis (Ph.D.) | Qualification Level: | Doctoral | ||
EThOS ID: | uk.bl.ethos.486059 | DOI: | Not available | ||
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