Preparation, Characterization and CO Oxidation Performance of Ag<sub>2</sub>O/γ-Al<sub>2</sub>O<sub>3</sub> and (Ag<sub>2</sub>O+RuO<sub>2</sub>)/γ-Al<sub>2</sub>O<sub>3</sub> Catalysts
This research dealt with the preparation and characterization of silver oxide (SLO) nanomaterials (NMs) and their composite catalysts (i.e., silver and ruthenium oxide (SLORUO)). The prepared materials were tested for their catalytic performance in carbon monoxide (CO) oxidation. Generally, silver i...
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MDPI AG
2020-06-01
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| Online Access: | https://www.mdpi.com/2571-9637/3/2/19 |
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| author | Antony Ananth Rak Hyun Jeong Jin-Hyo Boo |
| author_facet | Antony Ananth Rak Hyun Jeong Jin-Hyo Boo |
| author_sort | Antony Ananth |
| collection | DOAJ |
| description | This research dealt with the preparation and characterization of silver oxide (SLO) nanomaterials (NMs) and their composite catalysts (i.e., silver and ruthenium oxide (SLORUO)). The prepared materials were tested for their catalytic performance in carbon monoxide (CO) oxidation. Generally, silver in its pure state is not widely used for CO oxidation due to stability and structural issues. However, the usage of subsurface oxygen and oxygen-induced reconstruction could be effective as an oxidation catalyst at a slightly high temperature. The low-temperature reaction of highly active RuO<sub>2</sub> (RUO) is a well-known phenomenon. Thus, the possibility of using it with SLO to observe the combined catalytic behavior was investigated. The wet chemically prepared SLO and SLORUO NMs exhibited spherical and rods in spherical aggregate-type surface morphology belonging to cubic and rutile crystalline structures, respectively. The NMs and catalysts (i.e., the NMs on γ-Al<sub>2</sub>O<sub>3</sub> catalyst support at 0.5 and 1.0 wt.% ranges) showed good thermal stability. The dry and wet CO oxidation using RUO and SLO showed concentration-dependent catalytic activity. The RUO, SLO, and SLORUO composites using 0.5 wt.% showed full CO oxidation at 200, 300, and 225 °C, respectively. The reasons for the observed activity of the catalysts are explained based on the pore characteristics, chemical composition, and dispersion using H<sub>2</sub> temperature-programmed reduction (TPR) behaviors. |
| first_indexed | 2024-03-10T18:57:25Z |
| format | Article |
| id | doaj.art-9176a6ef96fe49cd9d9ba061f4a4e150 |
| institution | Directory Open Access Journal |
| issn | 2571-9637 |
| language | English |
| last_indexed | 2024-03-10T18:57:25Z |
| publishDate | 2020-06-01 |
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| series | Surfaces |
| spelling | doaj.art-9176a6ef96fe49cd9d9ba061f4a4e1502023-11-20T04:40:56ZengMDPI AGSurfaces2571-96372020-06-013225126410.3390/surfaces3020019Preparation, Characterization and CO Oxidation Performance of Ag<sub>2</sub>O/γ-Al<sub>2</sub>O<sub>3</sub> and (Ag<sub>2</sub>O+RuO<sub>2</sub>)/γ-Al<sub>2</sub>O<sub>3</sub> CatalystsAntony Ananth0Rak Hyun Jeong1Jin-Hyo Boo2Department of Chemistry, Sungkyunkwan University, Suwon 16419, KoreaDepartment of Chemistry, Sungkyunkwan University, Suwon 16419, KoreaDepartment of Chemistry, Sungkyunkwan University, Suwon 16419, KoreaThis research dealt with the preparation and characterization of silver oxide (SLO) nanomaterials (NMs) and their composite catalysts (i.e., silver and ruthenium oxide (SLORUO)). The prepared materials were tested for their catalytic performance in carbon monoxide (CO) oxidation. Generally, silver in its pure state is not widely used for CO oxidation due to stability and structural issues. However, the usage of subsurface oxygen and oxygen-induced reconstruction could be effective as an oxidation catalyst at a slightly high temperature. The low-temperature reaction of highly active RuO<sub>2</sub> (RUO) is a well-known phenomenon. Thus, the possibility of using it with SLO to observe the combined catalytic behavior was investigated. The wet chemically prepared SLO and SLORUO NMs exhibited spherical and rods in spherical aggregate-type surface morphology belonging to cubic and rutile crystalline structures, respectively. The NMs and catalysts (i.e., the NMs on γ-Al<sub>2</sub>O<sub>3</sub> catalyst support at 0.5 and 1.0 wt.% ranges) showed good thermal stability. The dry and wet CO oxidation using RUO and SLO showed concentration-dependent catalytic activity. The RUO, SLO, and SLORUO composites using 0.5 wt.% showed full CO oxidation at 200, 300, and 225 °C, respectively. The reasons for the observed activity of the catalysts are explained based on the pore characteristics, chemical composition, and dispersion using H<sub>2</sub> temperature-programmed reduction (TPR) behaviors.https://www.mdpi.com/2571-9637/3/2/19silver oxideCO oxidationruthenium oxideAg<sub>2</sub>O/RuO<sub>2</sub>composite |
| spellingShingle | Antony Ananth Rak Hyun Jeong Jin-Hyo Boo Preparation, Characterization and CO Oxidation Performance of Ag<sub>2</sub>O/γ-Al<sub>2</sub>O<sub>3</sub> and (Ag<sub>2</sub>O+RuO<sub>2</sub>)/γ-Al<sub>2</sub>O<sub>3</sub> Catalysts Surfaces silver oxide CO oxidation ruthenium oxide Ag<sub>2</sub>O/RuO<sub>2</sub> composite |
| title | Preparation, Characterization and CO Oxidation Performance of Ag<sub>2</sub>O/γ-Al<sub>2</sub>O<sub>3</sub> and (Ag<sub>2</sub>O+RuO<sub>2</sub>)/γ-Al<sub>2</sub>O<sub>3</sub> Catalysts |
| title_full | Preparation, Characterization and CO Oxidation Performance of Ag<sub>2</sub>O/γ-Al<sub>2</sub>O<sub>3</sub> and (Ag<sub>2</sub>O+RuO<sub>2</sub>)/γ-Al<sub>2</sub>O<sub>3</sub> Catalysts |
| title_fullStr | Preparation, Characterization and CO Oxidation Performance of Ag<sub>2</sub>O/γ-Al<sub>2</sub>O<sub>3</sub> and (Ag<sub>2</sub>O+RuO<sub>2</sub>)/γ-Al<sub>2</sub>O<sub>3</sub> Catalysts |
| title_full_unstemmed | Preparation, Characterization and CO Oxidation Performance of Ag<sub>2</sub>O/γ-Al<sub>2</sub>O<sub>3</sub> and (Ag<sub>2</sub>O+RuO<sub>2</sub>)/γ-Al<sub>2</sub>O<sub>3</sub> Catalysts |
| title_short | Preparation, Characterization and CO Oxidation Performance of Ag<sub>2</sub>O/γ-Al<sub>2</sub>O<sub>3</sub> and (Ag<sub>2</sub>O+RuO<sub>2</sub>)/γ-Al<sub>2</sub>O<sub>3</sub> Catalysts |
| title_sort | preparation characterization and co oxidation performance of ag sub 2 sub o γ al sub 2 sub o sub 3 sub and ag sub 2 sub o ruo sub 2 sub γ al sub 2 sub o sub 3 sub catalysts |
| topic | silver oxide CO oxidation ruthenium oxide Ag<sub>2</sub>O/RuO<sub>2</sub> composite |
| url | https://www.mdpi.com/2571-9637/3/2/19 |
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