Use this URL to cite or link to this record in EThOS:
Title: Selective hydrogenation of carboxylic acids, triglycerides and vegetable oils under mild conditions using Pt/TiO² and Pt-Re/TiO² catalysts
Author: Alikasturi, Amin Safwan
ISNI:       0000 0004 6062 3744
Awarding Body: Queen's University Belfast
Current Institution: Queen's University Belfast
Date of Award: 2016
Availability of Full Text:
Access from EThOS:
Hydrogenation processes are used extensively for chemical transformations in industries. For instance, the reduction of fats and oils has been performed in the oleochemical industry since the early 20th century. The carbonyl compounds include carboxylic acids, esters, triglycerides etc. are widely found in nature. These natural resources are hydrogenated using designated catalysts to produce valuable alcohols and alkanes with excellent selectivities and conversion. The selective hydrogenation of these carbonyl compounds under mild reaction temperatures and pressures has been achieved using monometallic, PtITi02, and bimetallic, Pt-RelTi02, catalysts. Selectivities of >950/0 towards the alcohol were achieved in carboxylic acids and isocarboxylic acid hydrogenation, >90% selectivity towards alcohols products in dicarboxylic acid and triglyceride hydrogenation, and 70-900/0 selectivity towards alcohol products in vegetable oils hydrogenation using the monometallic catalyst. In general, the bimetallic catalyst greatly enhanced the reaction rate and predominantly led to alkanes in all the hydrogenations. Under inert gas conditions, the monocarboxylic acid led to 100% selectivity towards alkanes via direct decarboxylation using the bimetallic catalyst, whereas in the case of the dicarboxylic acid and triglycerides, no reaction occurred. In general, the selectivity towards alcohols was found to increase by increasing the reaction hydrogen pressure. Both monometallic and bimetallic catalysts are robust, reusable and highly suitable for scale up in commercial applications to replace our dependency on non-renewable resources. Moreover, the catalyst has high potential to replace common nickel-based catalysts that are still used in hydrogenation of fats and oils and the products formed, and reduce the carbon dioxide emissions by decreaSing the energy demand.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available