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Low-temperature oxidation of carbon monoxide over Bi-metallic nanoparticles incorporated three dimensional silica
Abstract In the current study, four new catalysts were synthetized by using TUD-1 mesoporous material as a support for bi-metallic Noble metals nanoparticles. M-Au-TUD-1 (M = Rh, Pd, Pt, and Ag) were prepared with a total metals loading of 2 wt% by applying the ratio of 1Au:1M. Several physical and chemical characterizations were performed to understand the structure of the prepared catalysts. The characterization results showed the formation of bi-metallic alloys between Au and Pd, Rh or Ag, while the formation of alloy between Au and Pt was not confirmed under the applied synthesis conditions. The formed bi-metallic alloy nanoparticles were found to be highly distributed through the mesoporous silica and the average size of the formed nanoparticles was 15–30 nm. The prepared samples were investigated to catalyze the environmentally impacted reaction of carbon monooxide (CO) oxidation to carbon dioxide (CO2). The catalytic efficiency of Ag–Au catalyst was higher than the other investigated catalysts, 100% of CO gas was converted over Ag–Au catalyst at 25 °C. Moreover, Pt–Au and Pd–Au catalysts exhibited similar activity to bare Au nanoparticles. Moreover, the stability of the four investigated catalysts was investigated by using the same catalytic sample in ten consecutive reactions without treatment, Rh–Au-TUD-1 and Pt–Au-TUD-1 exhibited the highest stability, while, Ag–Au showed partial deactivation due to the oxidation of Ag to Ag2O.
Graphical abstract Display Omitted
Highlights Highly-distributed nanoparticles of four Noble metals alloys were incorporated into TUD-1. The four alloys were formed between Au and Pd, Pt, Ag, or Rh. The catalytic activity of the prepared catalysts was investigated in CO oxidation. Au–Ag exhibited the highest activity; 100% conversion at 303K. All the alloys nanoparticles showed also high stability for 10 consecutive runs.
Low-temperature oxidation of carbon monoxide over Bi-metallic nanoparticles incorporated three dimensional silica
Abstract In the current study, four new catalysts were synthetized by using TUD-1 mesoporous material as a support for bi-metallic Noble metals nanoparticles. M-Au-TUD-1 (M = Rh, Pd, Pt, and Ag) were prepared with a total metals loading of 2 wt% by applying the ratio of 1Au:1M. Several physical and chemical characterizations were performed to understand the structure of the prepared catalysts. The characterization results showed the formation of bi-metallic alloys between Au and Pd, Rh or Ag, while the formation of alloy between Au and Pt was not confirmed under the applied synthesis conditions. The formed bi-metallic alloy nanoparticles were found to be highly distributed through the mesoporous silica and the average size of the formed nanoparticles was 15–30 nm. The prepared samples were investigated to catalyze the environmentally impacted reaction of carbon monooxide (CO) oxidation to carbon dioxide (CO2). The catalytic efficiency of Ag–Au catalyst was higher than the other investigated catalysts, 100% of CO gas was converted over Ag–Au catalyst at 25 °C. Moreover, Pt–Au and Pd–Au catalysts exhibited similar activity to bare Au nanoparticles. Moreover, the stability of the four investigated catalysts was investigated by using the same catalytic sample in ten consecutive reactions without treatment, Rh–Au-TUD-1 and Pt–Au-TUD-1 exhibited the highest stability, while, Ag–Au showed partial deactivation due to the oxidation of Ag to Ag2O.
Graphical abstract Display Omitted
Highlights Highly-distributed nanoparticles of four Noble metals alloys were incorporated into TUD-1. The four alloys were formed between Au and Pd, Pt, Ag, or Rh. The catalytic activity of the prepared catalysts was investigated in CO oxidation. Au–Ag exhibited the highest activity; 100% conversion at 303K. All the alloys nanoparticles showed also high stability for 10 consecutive runs.
Low-temperature oxidation of carbon monoxide over Bi-metallic nanoparticles incorporated three dimensional silica
Hamdy, Mohamed S. (Autor:in) / Al-Shehri, Badria M. (Autor:in) / Eissa, Murad (Autor:in) / Alharthi, Fahad A. (Autor:in) / Alghamdi, Abdulaziz Ali (Autor:in) / Al-Zaqri, Nabil (Autor:in)
Atmospheric Environment ; 244
20.09.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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