Activity of Ag/CeZrO<sub>2</sub>, Ag+K/CeZrO<sub>2</sub>, and Ag-Au+K/CeZrO<sub>2</sub> Systems for Lean Burn Exhaust Clean-Up
Herein, the activity of Ag and bimetallic Au-Ag catalysts, supported over Ce<sub>0</sub>.<sub>85</sub>Zr<sub>0</sub>.<sub>15</sub>O<sub>2</sub> (CZ), was investigated in a complex stream, whose components included CO, C<sub>3</sub&...
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MDPI AG
2021-08-01
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| Series: | Catalysts |
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| Online Access: | https://www.mdpi.com/2073-4344/11/9/1041 |
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| author | Ewa M. Iwanek (nee Wilczkowska) Leonarda Francesca Liotta Shazam Williams Linjie Hu Huitian Ju Giuseppe Pantaleo Alisha Thapar Zbigniew Kaszkur Donald W. Kirk Marek Gliński |
| author_facet | Ewa M. Iwanek (nee Wilczkowska) Leonarda Francesca Liotta Shazam Williams Linjie Hu Huitian Ju Giuseppe Pantaleo Alisha Thapar Zbigniew Kaszkur Donald W. Kirk Marek Gliński |
| author_sort | Ewa M. Iwanek (nee Wilczkowska) |
| collection | DOAJ |
| description | Herein, the activity of Ag and bimetallic Au-Ag catalysts, supported over Ce<sub>0</sub>.<sub>85</sub>Zr<sub>0</sub>.<sub>15</sub>O<sub>2</sub> (CZ), was investigated in a complex stream, whose components included CO, C<sub>3</sub>H<sub>8</sub>, NO, O<sub>2</sub>, and, optionally, an injection of water vapor. In such a stream, three of the possible reactions that can occur are CO oxidation, propane combustion, and NO oxidation. The aim of these studies was to explore whether silver, due to its strong affinity to oxygen, will counteract the stabilization of oxygen by potassium. The effect of the presence of potassium ions on the activity of the monometallic silver catalysts is beneficial in the complex stream without water vapor in all three studied reactions, although it is negligible in the model CO stream. It has been shown that water vapor strongly suppresses the activity of the Ag+K/CZ catalyst, much more so than that of the Ag/CZ catalyst. The second purpose of the work was to determine whether the negative effect of potassium ions on the activity of nanogold catalyst can be countered by the addition of silver. Studies in a model stream for CO oxidation have shown that, for a catalyst preloaded with gold, the effect of potassium is nulled by silver, and the activity of AuAg + 0.15 at%K/CZ and AuAg + 0.30 at%K/CZ is the same as that of the monometallic Au catalyst. Conversely, when the reaction is carried out in a complex stream, containing CO, C<sub>3</sub>H<sub>8</sub>, NO, O<sub>2</sub>, and water vapor, the presence of water vapor leads to higher CO conversion as well as increased NO<sub>2</sub> formation and slightly suppresses the C<sub>3</sub>H<sub>8</sub> combustion. |
| first_indexed | 2024-03-10T07:50:47Z |
| format | Article |
| id | doaj.art-ec2c006713f4408a8d544c08595bad5b |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-10T07:50:47Z |
| publishDate | 2021-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Catalysts |
| spelling | doaj.art-ec2c006713f4408a8d544c08595bad5b2023-11-22T12:20:30ZengMDPI AGCatalysts2073-43442021-08-01119104110.3390/catal11091041Activity of Ag/CeZrO<sub>2</sub>, Ag+K/CeZrO<sub>2</sub>, and Ag-Au+K/CeZrO<sub>2</sub> Systems for Lean Burn Exhaust Clean-UpEwa M. Iwanek (nee Wilczkowska)0Leonarda Francesca Liotta1Shazam Williams2Linjie Hu3Huitian Ju4Giuseppe Pantaleo5Alisha Thapar6Zbigniew Kaszkur7Donald W. Kirk8Marek Gliński9Faculty of Applied Science and Technology, Sheridan College, Brampton, ON L6Y 5H9, CanadaIstituto per lo Studio di Materiali Nanostrutturati (ISMN)-CNR, I-90146 Palermo, ItalyDCL International Inc., Concord, ON L4K 4T5, CanadaDCL International Inc., Concord, ON L4K 4T5, CanadaDCL International Inc., Concord, ON L4K 4T5, CanadaIstituto per lo Studio di Materiali Nanostrutturati (ISMN)-CNR, I-90146 Palermo, ItalyFaculty of Applied Science and Technology, Sheridan College, Brampton, ON L6Y 5H9, CanadaInstitute of Physical Chemistry, Polish Academy of Sciences, 01-224 Warsaw, PolandDepartment of Chemical Engineering and Applied Science, University of Toronto, Toronto, ON M5S 3E5, CanadaFaculty of Chemistry, Warsaw University of Technology, 00-664 Warsaw, PolandHerein, the activity of Ag and bimetallic Au-Ag catalysts, supported over Ce<sub>0</sub>.<sub>85</sub>Zr<sub>0</sub>.<sub>15</sub>O<sub>2</sub> (CZ), was investigated in a complex stream, whose components included CO, C<sub>3</sub>H<sub>8</sub>, NO, O<sub>2</sub>, and, optionally, an injection of water vapor. In such a stream, three of the possible reactions that can occur are CO oxidation, propane combustion, and NO oxidation. The aim of these studies was to explore whether silver, due to its strong affinity to oxygen, will counteract the stabilization of oxygen by potassium. The effect of the presence of potassium ions on the activity of the monometallic silver catalysts is beneficial in the complex stream without water vapor in all three studied reactions, although it is negligible in the model CO stream. It has been shown that water vapor strongly suppresses the activity of the Ag+K/CZ catalyst, much more so than that of the Ag/CZ catalyst. The second purpose of the work was to determine whether the negative effect of potassium ions on the activity of nanogold catalyst can be countered by the addition of silver. Studies in a model stream for CO oxidation have shown that, for a catalyst preloaded with gold, the effect of potassium is nulled by silver, and the activity of AuAg + 0.15 at%K/CZ and AuAg + 0.30 at%K/CZ is the same as that of the monometallic Au catalyst. Conversely, when the reaction is carried out in a complex stream, containing CO, C<sub>3</sub>H<sub>8</sub>, NO, O<sub>2</sub>, and water vapor, the presence of water vapor leads to higher CO conversion as well as increased NO<sub>2</sub> formation and slightly suppresses the C<sub>3</sub>H<sub>8</sub> combustion.https://www.mdpi.com/2073-4344/11/9/1041NO oxidationCO oxidationpropane combustionAg and Ag-Au bimetallic systemspotassium ion effect |
| spellingShingle | Ewa M. Iwanek (nee Wilczkowska) Leonarda Francesca Liotta Shazam Williams Linjie Hu Huitian Ju Giuseppe Pantaleo Alisha Thapar Zbigniew Kaszkur Donald W. Kirk Marek Gliński Activity of Ag/CeZrO<sub>2</sub>, Ag+K/CeZrO<sub>2</sub>, and Ag-Au+K/CeZrO<sub>2</sub> Systems for Lean Burn Exhaust Clean-Up Catalysts NO oxidation CO oxidation propane combustion Ag and Ag-Au bimetallic systems potassium ion effect |
| title | Activity of Ag/CeZrO<sub>2</sub>, Ag+K/CeZrO<sub>2</sub>, and Ag-Au+K/CeZrO<sub>2</sub> Systems for Lean Burn Exhaust Clean-Up |
| title_full | Activity of Ag/CeZrO<sub>2</sub>, Ag+K/CeZrO<sub>2</sub>, and Ag-Au+K/CeZrO<sub>2</sub> Systems for Lean Burn Exhaust Clean-Up |
| title_fullStr | Activity of Ag/CeZrO<sub>2</sub>, Ag+K/CeZrO<sub>2</sub>, and Ag-Au+K/CeZrO<sub>2</sub> Systems for Lean Burn Exhaust Clean-Up |
| title_full_unstemmed | Activity of Ag/CeZrO<sub>2</sub>, Ag+K/CeZrO<sub>2</sub>, and Ag-Au+K/CeZrO<sub>2</sub> Systems for Lean Burn Exhaust Clean-Up |
| title_short | Activity of Ag/CeZrO<sub>2</sub>, Ag+K/CeZrO<sub>2</sub>, and Ag-Au+K/CeZrO<sub>2</sub> Systems for Lean Burn Exhaust Clean-Up |
| title_sort | activity of ag cezro sub 2 sub ag k cezro sub 2 sub and ag au k cezro sub 2 sub systems for lean burn exhaust clean up |
| topic | NO oxidation CO oxidation propane combustion Ag and Ag-Au bimetallic systems potassium ion effect |
| url | https://www.mdpi.com/2073-4344/11/9/1041 |
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