Highly Active Large Au Clusters and Even More Active Ag Nanoparticles Supported on Ceria-Zirconia: Impact of Particle Size and Potassium Ion Loading on Activity in Catalytic Transfer Hydrogenation
Although heterogeneous monometallic gold catalysts are commonly more active when the gold particles are smaller, this study shows that the reverse is true in the case of liquid phase catalytic transfer hydrogenation of acetophenone with 2-pentanol. Higher catalytic activity of larger gold particles,...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-08-01
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| Series: | Catalysts |
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| Online Access: | https://www.mdpi.com/2073-4344/12/9/974 |
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| author | Ewa M. Iwanek (nee Wilczkowska) Marek Gliński Aleksandra Siwiec Sylwia Siennicka Magdalena Zybert Zbigniew Kaszkur |
| author_facet | Ewa M. Iwanek (nee Wilczkowska) Marek Gliński Aleksandra Siwiec Sylwia Siennicka Magdalena Zybert Zbigniew Kaszkur |
| author_sort | Ewa M. Iwanek (nee Wilczkowska) |
| collection | DOAJ |
| description | Although heterogeneous monometallic gold catalysts are commonly more active when the gold particles are smaller, this study shows that the reverse is true in the case of liquid phase catalytic transfer hydrogenation of acetophenone with 2-pentanol. Higher catalytic activity of larger gold particles, i.e., over 30 nm in diameter, than of smaller particles of average 4 nm in size was observed. Moreover, this effect was contradictory to that observed for supported monometallic silver catalysts in which the interaction with the support and hence particle size was shown to cause drastic changes in the activity in this reaction, with the large particles being completely inactive and tiny ones being the most active system studied. In this reaction, the ceria-zirconia solid solutions were used as the supports for the catalysts and both zirconium doped ceria, as well as cerium doped zirconia carriers were tested. The supports themselves exhibited little activity in this reaction. It was shown that the activity of the supports and catalysts depends on the Ce/Zr ratio and potassium content. Both types of catalysts showed excellent selectivity to 1-phenylethanol and conversion of acetophenone, although it was noted that a high loading of potassium carbonate in the gold catalysts propelled undesired reactions, thereby reducing the selectivity to 1-phenylethanol. |
| first_indexed | 2024-03-10T00:28:52Z |
| format | Article |
| id | doaj.art-b07a1b84706447abaec04e7234fd1cd9 |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-10T00:28:52Z |
| publishDate | 2022-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Catalysts |
| spelling | doaj.art-b07a1b84706447abaec04e7234fd1cd92023-11-23T15:30:13ZengMDPI AGCatalysts2073-43442022-08-0112997410.3390/catal12090974Highly Active Large Au Clusters and Even More Active Ag Nanoparticles Supported on Ceria-Zirconia: Impact of Particle Size and Potassium Ion Loading on Activity in Catalytic Transfer HydrogenationEwa M. Iwanek (nee Wilczkowska)0Marek Gliński1Aleksandra Siwiec2Sylwia Siennicka3Magdalena Zybert4Zbigniew Kaszkur5Faculty of Chemistry, Warsaw University of Technology, 00-664 Warsaw, PolandFaculty of Chemistry, Warsaw University of Technology, 00-664 Warsaw, PolandFaculty of Chemistry, Warsaw University of Technology, 00-664 Warsaw, PolandFaculty of Chemistry, Warsaw University of Technology, 00-664 Warsaw, PolandFaculty of Chemistry, Warsaw University of Technology, 00-664 Warsaw, PolandInstitute of Physical Chemistry, Polish Academy of Sciences, 01-224 Warsaw, PolandAlthough heterogeneous monometallic gold catalysts are commonly more active when the gold particles are smaller, this study shows that the reverse is true in the case of liquid phase catalytic transfer hydrogenation of acetophenone with 2-pentanol. Higher catalytic activity of larger gold particles, i.e., over 30 nm in diameter, than of smaller particles of average 4 nm in size was observed. Moreover, this effect was contradictory to that observed for supported monometallic silver catalysts in which the interaction with the support and hence particle size was shown to cause drastic changes in the activity in this reaction, with the large particles being completely inactive and tiny ones being the most active system studied. In this reaction, the ceria-zirconia solid solutions were used as the supports for the catalysts and both zirconium doped ceria, as well as cerium doped zirconia carriers were tested. The supports themselves exhibited little activity in this reaction. It was shown that the activity of the supports and catalysts depends on the Ce/Zr ratio and potassium content. Both types of catalysts showed excellent selectivity to 1-phenylethanol and conversion of acetophenone, although it was noted that a high loading of potassium carbonate in the gold catalysts propelled undesired reactions, thereby reducing the selectivity to 1-phenylethanol.https://www.mdpi.com/2073-4344/12/9/974catalytic transfer hydrogenationpotassium ion dopingceria-zirconialarge gold particlessilver nanoparticles |
| spellingShingle | Ewa M. Iwanek (nee Wilczkowska) Marek Gliński Aleksandra Siwiec Sylwia Siennicka Magdalena Zybert Zbigniew Kaszkur Highly Active Large Au Clusters and Even More Active Ag Nanoparticles Supported on Ceria-Zirconia: Impact of Particle Size and Potassium Ion Loading on Activity in Catalytic Transfer Hydrogenation Catalysts catalytic transfer hydrogenation potassium ion doping ceria-zirconia large gold particles silver nanoparticles |
| title | Highly Active Large Au Clusters and Even More Active Ag Nanoparticles Supported on Ceria-Zirconia: Impact of Particle Size and Potassium Ion Loading on Activity in Catalytic Transfer Hydrogenation |
| title_full | Highly Active Large Au Clusters and Even More Active Ag Nanoparticles Supported on Ceria-Zirconia: Impact of Particle Size and Potassium Ion Loading on Activity in Catalytic Transfer Hydrogenation |
| title_fullStr | Highly Active Large Au Clusters and Even More Active Ag Nanoparticles Supported on Ceria-Zirconia: Impact of Particle Size and Potassium Ion Loading on Activity in Catalytic Transfer Hydrogenation |
| title_full_unstemmed | Highly Active Large Au Clusters and Even More Active Ag Nanoparticles Supported on Ceria-Zirconia: Impact of Particle Size and Potassium Ion Loading on Activity in Catalytic Transfer Hydrogenation |
| title_short | Highly Active Large Au Clusters and Even More Active Ag Nanoparticles Supported on Ceria-Zirconia: Impact of Particle Size and Potassium Ion Loading on Activity in Catalytic Transfer Hydrogenation |
| title_sort | highly active large au clusters and even more active ag nanoparticles supported on ceria zirconia impact of particle size and potassium ion loading on activity in catalytic transfer hydrogenation |
| topic | catalytic transfer hydrogenation potassium ion doping ceria-zirconia large gold particles silver nanoparticles |
| url | https://www.mdpi.com/2073-4344/12/9/974 |
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