Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
The effect of sulphur in fuel on the performance of automotive catalysts
Catalysts have been used on cars since 1974 to reduce tailpipe emission levels of carbon monoxide, hydrocarbons and oxides of nitrogen. Initially, oxidation catalysts were used that operated under very lean air/fuel conditions and gave rise to increased sulphate particulate emissions. These sulphate...
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Language: | English |
| Published: |
Energy Research Centre
2016
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613287132168192 |
|---|---|
| access_status_str | Open Access |
| author | Siemelink, Johannes Jacobus |
| author2 | Dutkiewicz, Ryszard Karol |
| author_browse | Dutkiewicz, Ryszard Karol Siemelink, Johannes Jacobus |
| author_facet | Dutkiewicz, Ryszard Karol Siemelink, Johannes Jacobus |
| author_sort | Siemelink, Johannes Jacobus |
| collection | Thesis |
| description | Catalysts have been used on cars since 1974 to reduce tailpipe emission levels of carbon monoxide, hydrocarbons and oxides of nitrogen. Initially, oxidation catalysts were used that operated under very lean air/fuel conditions and gave rise to increased sulphate particulate emissions. These sulphate emissions could fortunately be reduced by better air/fuel control. However, the introduction of more active catalyst compositions, in particular the use of cerium oxide components on the wash coat, led to bad odour complaints from motorists. In the report it is shown that under fuel-lean conditions, sulphur, originating from the fuel, is stored as aluminium and cerium sulphates onto the washcoat. Upon a rapid change to fuel-rich engine operation the stored sulphates are released as hydrogen sulphide and is the cause for the smell observed. The sulphur storage/release process results in hydrogen sulphide emissions many times higher than is possible from steady-state conversion from the fuel sulphur level. By using a catalyst/engine combination on a testbed the experiments have shown that the hydrogen sulphide release is a kinetically limited reaction and, apart from the air/fuel control, depends mainly on the catalyst temperature. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/21486 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:43.673Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Energy Research Centre |
| publisherStr | Energy Research Centre |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/21486 The effect of sulphur in fuel on the performance of automotive catalysts Siemelink, Johannes Jacobus Dutkiewicz, Ryszard Karol Mechanical Engineering Energy Research Applied Science Catalysts have been used on cars since 1974 to reduce tailpipe emission levels of carbon monoxide, hydrocarbons and oxides of nitrogen. Initially, oxidation catalysts were used that operated under very lean air/fuel conditions and gave rise to increased sulphate particulate emissions. These sulphate emissions could fortunately be reduced by better air/fuel control. However, the introduction of more active catalyst compositions, in particular the use of cerium oxide components on the wash coat, led to bad odour complaints from motorists. In the report it is shown that under fuel-lean conditions, sulphur, originating from the fuel, is stored as aluminium and cerium sulphates onto the washcoat. Upon a rapid change to fuel-rich engine operation the stored sulphates are released as hydrogen sulphide and is the cause for the smell observed. The sulphur storage/release process results in hydrogen sulphide emissions many times higher than is possible from steady-state conversion from the fuel sulphur level. By using a catalyst/engine combination on a testbed the experiments have shown that the hydrogen sulphide release is a kinetically limited reaction and, apart from the air/fuel control, depends mainly on the catalyst temperature. 2016-08-24T12:50:46Z 2016-08-24T12:50:46Z 1994 Master Thesis Masters MSc (Eng) http://hdl.handle.net/11427/21486 eng application/pdf Energy Research Centre Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Mechanical Engineering Energy Research Applied Science Siemelink, Johannes Jacobus The effect of sulphur in fuel on the performance of automotive catalysts |
| thesis_degree_str | Master's |
| title | The effect of sulphur in fuel on the performance of automotive catalysts |
| title_full | The effect of sulphur in fuel on the performance of automotive catalysts |
| title_fullStr | The effect of sulphur in fuel on the performance of automotive catalysts |
| title_full_unstemmed | The effect of sulphur in fuel on the performance of automotive catalysts |
| title_short | The effect of sulphur in fuel on the performance of automotive catalysts |
| title_sort | effect of sulphur in fuel on the performance of automotive catalysts |
| topic | Mechanical Engineering Energy Research Applied Science |
| url | http://hdl.handle.net/11427/21486 |
| work_keys_str_mv | AT siemelinkjohannesjacobus theeffectofsulphurinfuelontheperformanceofautomotivecatalysts AT siemelinkjohannesjacobus effectofsulphurinfuelontheperformanceofautomotivecatalysts |