Revisiting the Impact of Tungsten on the Catalytic Properties of Ammonia-SCR V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> Catalysts: Geometric vs. Electronic Effects
The SCR performance of V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> SCR-catalysts characterized by different surface W density (2.1W/nm<sup>2</sup> and 9.5W/nm<sup>2</sup>) and different surface V density varying in...
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| Format: | Article |
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MDPI AG
2023-02-01
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| Series: | Chemistry |
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| Online Access: | https://www.mdpi.com/2624-8549/5/1/23 |
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| author | Hermann Wilfried Siaka Christophe Dujardin Alain Moissette Pascal Granger |
| author_facet | Hermann Wilfried Siaka Christophe Dujardin Alain Moissette Pascal Granger |
| author_sort | Hermann Wilfried Siaka |
| collection | DOAJ |
| description | The SCR performance of V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> SCR-catalysts characterized by different surface W density (2.1W/nm<sup>2</sup> and 9.5W/nm<sup>2</sup>) and different surface V density varying in the range 1–8V/nm<sup>2</sup> has been investigated in order to clarify existing controversies on the preferential involvement of electronic and geometric effects in the catalytic properties. It was found that tungsten has a weak effect on the VO<i><sub>x</sub></i> cluster size distribution through contraction of dilution effect. In contrast, the optimal interaction between W and V, when both reach their highest composition, appears to be a relevant parameter that can enhance their acidic properties and improve the catalytic efficiency in dry conditions. On the other hand, an absence of significant interaction leads to discontinuity due to deactivation. In the presence of steam, acidic properties are averaged, lowering the impact of the V to W ratio. Finally, the critical importance of acidic properties which outperform redox properties in the definition of active site is pointed out in the light of this study. |
| first_indexed | 2024-03-11T06:46:16Z |
| format | Article |
| id | doaj.art-02ca0b11f6ad40b0a3d5d3587aae5e23 |
| institution | Directory Open Access Journal |
| issn | 2624-8549 |
| language | English |
| last_indexed | 2024-03-11T06:46:16Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Chemistry |
| spelling | doaj.art-02ca0b11f6ad40b0a3d5d3587aae5e232023-11-17T10:15:39ZengMDPI AGChemistry2624-85492023-02-015129431310.3390/chemistry5010023Revisiting the Impact of Tungsten on the Catalytic Properties of Ammonia-SCR V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> Catalysts: Geometric vs. Electronic EffectsHermann Wilfried Siaka0Christophe Dujardin1Alain Moissette2Pascal Granger3Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181—UCCS—Unité de Catalyse et Chimie du Solide, 59000 Lille, FranceUniv. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181—UCCS—Unité de Catalyse et Chimie du Solide, 59000 Lille, FranceLaboratoire de Spectroscopie pour les Interactions la Réactivité et l’Environnement, Univ. Lille, CNRS, UMR CNRS 8516-LASIRE, 59000 Lille, FranceUniv. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181—UCCS—Unité de Catalyse et Chimie du Solide, 59000 Lille, FranceThe SCR performance of V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> SCR-catalysts characterized by different surface W density (2.1W/nm<sup>2</sup> and 9.5W/nm<sup>2</sup>) and different surface V density varying in the range 1–8V/nm<sup>2</sup> has been investigated in order to clarify existing controversies on the preferential involvement of electronic and geometric effects in the catalytic properties. It was found that tungsten has a weak effect on the VO<i><sub>x</sub></i> cluster size distribution through contraction of dilution effect. In contrast, the optimal interaction between W and V, when both reach their highest composition, appears to be a relevant parameter that can enhance their acidic properties and improve the catalytic efficiency in dry conditions. On the other hand, an absence of significant interaction leads to discontinuity due to deactivation. In the presence of steam, acidic properties are averaged, lowering the impact of the V to W ratio. Finally, the critical importance of acidic properties which outperform redox properties in the definition of active site is pointed out in the light of this study.https://www.mdpi.com/2624-8549/5/1/23selective catalytic reductionNO<i><sub>x</sub></i>NH<sub>3</sub>V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> |
| spellingShingle | Hermann Wilfried Siaka Christophe Dujardin Alain Moissette Pascal Granger Revisiting the Impact of Tungsten on the Catalytic Properties of Ammonia-SCR V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> Catalysts: Geometric vs. Electronic Effects Chemistry selective catalytic reduction NO<i><sub>x</sub></i> NH<sub>3</sub> V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> |
| title | Revisiting the Impact of Tungsten on the Catalytic Properties of Ammonia-SCR V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> Catalysts: Geometric vs. Electronic Effects |
| title_full | Revisiting the Impact of Tungsten on the Catalytic Properties of Ammonia-SCR V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> Catalysts: Geometric vs. Electronic Effects |
| title_fullStr | Revisiting the Impact of Tungsten on the Catalytic Properties of Ammonia-SCR V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> Catalysts: Geometric vs. Electronic Effects |
| title_full_unstemmed | Revisiting the Impact of Tungsten on the Catalytic Properties of Ammonia-SCR V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> Catalysts: Geometric vs. Electronic Effects |
| title_short | Revisiting the Impact of Tungsten on the Catalytic Properties of Ammonia-SCR V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> Catalysts: Geometric vs. Electronic Effects |
| title_sort | revisiting the impact of tungsten on the catalytic properties of ammonia scr v sub 2 sub o sub 5 sub wo sub 3 sub tio sub 2 sub catalysts geometric vs electronic effects |
| topic | selective catalytic reduction NO<i><sub>x</sub></i> NH<sub>3</sub> V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> |
| url | https://www.mdpi.com/2624-8549/5/1/23 |
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