Reducibility Studies of Ceria, Ce<sub>0.85</sub>Zr<sub>0.15</sub>O<sub>2</sub> (CZ) and Au/CZ Catalysts after Alkali Ion Doping: Impact on Activity in Oxidation of NO and CO
The aim of these studies was to perform thorough research on the influence of alkali metal ions (Li, Na, K and Cs) on the properties of nanogold catalysts supported on ceria–zirconia. The addition of alkali metal ions onto CeO<sub>2</sub> further affected the reducibility, which was not...
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MDPI AG
2022-05-01
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| Online Access: | https://www.mdpi.com/2073-4344/12/5/524 |
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| author | Ewa Maria Iwanek (nee Wilczkowska) Leonarda Francesca Liotta Shazam Williams Linjie Hu Huitian Ju Giuseppe Pantaleo Zbigniew Kaszkur Donald W. Kirk Wojciech Patkowski Marek Gliński |
| author_facet | Ewa Maria Iwanek (nee Wilczkowska) Leonarda Francesca Liotta Shazam Williams Linjie Hu Huitian Ju Giuseppe Pantaleo Zbigniew Kaszkur Donald W. Kirk Wojciech Patkowski Marek Gliński |
| author_sort | Ewa Maria Iwanek (nee Wilczkowska) |
| collection | DOAJ |
| description | The aim of these studies was to perform thorough research on the influence of alkali metal ions (Li, Na, K and Cs) on the properties of nanogold catalysts supported on ceria–zirconia. The addition of alkali metal ions onto CeO<sub>2</sub> further affected the reducibility, which was not noted for the Zr-doped support (Ce<sub>0.85</sub>Zr<sub>0.15</sub>O<sub>2</sub>). Despite the substantial impact of alkali metal ions on the reducibility of ceria, the activity in CO oxidation did not change much. In contrast, they do not have a large effect on the reducibility of Au/CZ but suppressed the activity of this system in CO oxidation. The results show that for CO oxidation, the negative effect of potassium ions is greater than that of sodium, which corresponds to the shift in the T<sub>max</sub> of the reduction peak towards higher temperatures. The negative effect of Li<sup>+</sup> and Cs<sup>+</sup> spans 50% CO conversion. The negative effect was visible for CO oxidation in both the model stream and the complex stream, which also contained hydrocarbons and NO. In the case of NO oxidation to NO<sub>2</sub>, two temperature regimes were observed for Au + 0.3 at% K/CZ, namely in the temperature range below 350 °C; the effect of potassium ions was beneficial for NO oxidation, whereas at higher temperatures, the undoped gold catalyst produced more NO<sub>2</sub>. |
| first_indexed | 2024-03-10T03:10:56Z |
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| language | English |
| last_indexed | 2024-03-10T03:10:56Z |
| publishDate | 2022-05-01 |
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| series | Catalysts |
| spelling | doaj.art-bfb15389d34541f89840a79a260569482023-11-23T10:26:09ZengMDPI AGCatalysts2073-43442022-05-0112552410.3390/catal12050524Reducibility Studies of Ceria, Ce<sub>0.85</sub>Zr<sub>0.15</sub>O<sub>2</sub> (CZ) and Au/CZ Catalysts after Alkali Ion Doping: Impact on Activity in Oxidation of NO and COEwa Maria Iwanek (nee Wilczkowska)0Leonarda Francesca Liotta1Shazam Williams2Linjie Hu3Huitian Ju4Giuseppe Pantaleo5Zbigniew Kaszkur6Donald W. Kirk7Wojciech Patkowski8Marek Gliński9Faculty of Chemistry, Warsaw University of Technology, 00-664 Warsaw, PolandIstituto 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, ItalyInstitute of Physical Chemistry, Polish Academy of Sciences, 01-224 Warsaw, PolandDepartment of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, ON M5S 3E5, CanadaFaculty of Chemistry, Warsaw University of Technology, 00-664 Warsaw, PolandFaculty of Chemistry, Warsaw University of Technology, 00-664 Warsaw, PolandThe aim of these studies was to perform thorough research on the influence of alkali metal ions (Li, Na, K and Cs) on the properties of nanogold catalysts supported on ceria–zirconia. The addition of alkali metal ions onto CeO<sub>2</sub> further affected the reducibility, which was not noted for the Zr-doped support (Ce<sub>0.85</sub>Zr<sub>0.15</sub>O<sub>2</sub>). Despite the substantial impact of alkali metal ions on the reducibility of ceria, the activity in CO oxidation did not change much. In contrast, they do not have a large effect on the reducibility of Au/CZ but suppressed the activity of this system in CO oxidation. The results show that for CO oxidation, the negative effect of potassium ions is greater than that of sodium, which corresponds to the shift in the T<sub>max</sub> of the reduction peak towards higher temperatures. The negative effect of Li<sup>+</sup> and Cs<sup>+</sup> spans 50% CO conversion. The negative effect was visible for CO oxidation in both the model stream and the complex stream, which also contained hydrocarbons and NO. In the case of NO oxidation to NO<sub>2</sub>, two temperature regimes were observed for Au + 0.3 at% K/CZ, namely in the temperature range below 350 °C; the effect of potassium ions was beneficial for NO oxidation, whereas at higher temperatures, the undoped gold catalyst produced more NO<sub>2</sub>.https://www.mdpi.com/2073-4344/12/5/524reducibilityceriacerium-zirconium mixed oxideAu catalystsCO oxidationalkali metal ions |
| spellingShingle | Ewa Maria Iwanek (nee Wilczkowska) Leonarda Francesca Liotta Shazam Williams Linjie Hu Huitian Ju Giuseppe Pantaleo Zbigniew Kaszkur Donald W. Kirk Wojciech Patkowski Marek Gliński Reducibility Studies of Ceria, Ce<sub>0.85</sub>Zr<sub>0.15</sub>O<sub>2</sub> (CZ) and Au/CZ Catalysts after Alkali Ion Doping: Impact on Activity in Oxidation of NO and CO Catalysts reducibility ceria cerium-zirconium mixed oxide Au catalysts CO oxidation alkali metal ions |
| title | Reducibility Studies of Ceria, Ce<sub>0.85</sub>Zr<sub>0.15</sub>O<sub>2</sub> (CZ) and Au/CZ Catalysts after Alkali Ion Doping: Impact on Activity in Oxidation of NO and CO |
| title_full | Reducibility Studies of Ceria, Ce<sub>0.85</sub>Zr<sub>0.15</sub>O<sub>2</sub> (CZ) and Au/CZ Catalysts after Alkali Ion Doping: Impact on Activity in Oxidation of NO and CO |
| title_fullStr | Reducibility Studies of Ceria, Ce<sub>0.85</sub>Zr<sub>0.15</sub>O<sub>2</sub> (CZ) and Au/CZ Catalysts after Alkali Ion Doping: Impact on Activity in Oxidation of NO and CO |
| title_full_unstemmed | Reducibility Studies of Ceria, Ce<sub>0.85</sub>Zr<sub>0.15</sub>O<sub>2</sub> (CZ) and Au/CZ Catalysts after Alkali Ion Doping: Impact on Activity in Oxidation of NO and CO |
| title_short | Reducibility Studies of Ceria, Ce<sub>0.85</sub>Zr<sub>0.15</sub>O<sub>2</sub> (CZ) and Au/CZ Catalysts after Alkali Ion Doping: Impact on Activity in Oxidation of NO and CO |
| title_sort | reducibility studies of ceria ce sub 0 85 sub zr sub 0 15 sub o sub 2 sub cz and au cz catalysts after alkali ion doping impact on activity in oxidation of no and co |
| topic | reducibility ceria cerium-zirconium mixed oxide Au catalysts CO oxidation alkali metal ions |
| url | https://www.mdpi.com/2073-4344/12/5/524 |
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