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Supported metal catalysts for water-gas shift conversion
Includes bibliographical references.
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| Main Author: | |
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
| Published: |
Centre for Catalysis Research
2015
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| _version_ | 1867614138370359296 |
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| access_status_str | Open Access |
| author | Tsui, Li-Hsin |
| author2 | Fletcher, Jack |
| author_browse | Fletcher, Jack Tsui, Li-Hsin |
| author_facet | Fletcher, Jack Tsui, Li-Hsin |
| author_sort | Tsui, Li-Hsin |
| collection | Thesis |
| description | Includes bibliographical references. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/13384 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:47:16.720Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2015 |
| publishDateRange | 2015 |
| publishDateSort | 2015 |
| publisher | Centre for Catalysis Research |
| publisherStr | Centre for Catalysis Research |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/13384 Supported metal catalysts for water-gas shift conversion Tsui, Li-Hsin Fletcher, Jack Böhringer, Walter Catalysis Research Includes bibliographical references. The interests in an alternative, sustainable power generation method has greatly increased in the past decade due to increases in greenhouse gases and its impact on global climate change. The use of fuel cells as a form of energy generation is extremely promising as it converts chemical potential energy directly to electrical energy, bypassing the Carnot cycle limitations. Various types of fuel cells have been developed, with the proton exchange membrane fuel cell (PEMFC) being most promising for mobile and small-scale stationary uses under transient conditions. The PEMFC uses hydrogen and oxygen to generate electrical energy. While oxygen can be obtained from air, hydrogen does not exist in its elemental form; hence a process train is required to refine fuels (such as fossil fuels and bio-fuels) into pure hydrogen. This has been successfully achieved by large-scale industrial plants. A typical fuel processing train consists of a steam reforming stage converting the fuel into syngas. This is followed by a water-gas shift (WGS) stage to convert carbon monoxide, which is a poison for the platinum catalysts within fuel cells, into carbon dioxide. If the CO concentration required is extremely low, a methanation or preferential oxidation stage can be used subsequent to the WGS stage. This study focuses on the water-gas shift stage of the fuel processing train. Industrial base metal WGS catalysts are not suitable for a miniaturized fuel processing train due to the catalysts being developed for continuous operations, as miniaturized fuel processing trains are expected to operate at transient conditions. A slow and controlled reduction process is also required prior to operation, as well as the pyrophoricity of industrial catalysts after reduction. These can pose safety issues with non-technical personnel in household applications (e.g. CHP). PGM-based catalysts have shown high activities for the water-gas shift reaction in literature, are not pyrophoric and do not require lengthy and sensitive reduction processes prior to operation. The objective of this study was to investigate and compare two base metal catalysts (high temperature (HT) shift Fe₃O₄/Cr₂O₃ and low temperature (LT) shift CuO/ZnO/Al₂O₃ catalyst) with a PGM based counterpart, as well as to investigate whether the catalysts are able to achieve a required 1 vol% CO via the water-gas shift reaction. For these investigations a synthetic feedstock was used, based on typical exit concentrations of a steam methane reformer. 2015-07-03T10:36:55Z 2015-07-03T10:36:55Z 2014 Master Thesis Masters MSc (Eng) http://hdl.handle.net/11427/13384 eng application/pdf Centre for Catalysis Research Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Catalysis Research Tsui, Li-Hsin Supported metal catalysts for water-gas shift conversion |
| thesis_degree_str | Master's |
| title | Supported metal catalysts for water-gas shift conversion |
| title_full | Supported metal catalysts for water-gas shift conversion |
| title_fullStr | Supported metal catalysts for water-gas shift conversion |
| title_full_unstemmed | Supported metal catalysts for water-gas shift conversion |
| title_short | Supported metal catalysts for water-gas shift conversion |
| title_sort | supported metal catalysts for water gas shift conversion |
| topic | Catalysis Research |
| url | http://hdl.handle.net/11427/13384 |
| work_keys_str_mv | AT tsuilihsin supportedmetalcatalystsforwatergasshiftconversion |