Selective Nitroaldol Condensations over Heterogeneous Catalysts in the Presence of Supercritical Carbon Dioxide

2008 ◽  
Vol 73 (21) ◽  
pp. 8520-8528 ◽  
Author(s):  
Roberto Ballini ◽  
Marco Noè ◽  
Alvise Perosa ◽  
Maurizio Selva
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Heterogeneous Catalysts ◽  
Supercritical Carbon

scholarly journals Synthesis of Supported Heterogeneous Catalysts by Laser Ablation of Metallic Palladium in Supercritical Carbon Dioxide Medium

Molecules ◽  
2020 ◽  
Vol 25 (24) ◽  
pp. 5807
Author(s):  
Oleg Parenago ◽  
Alexey Rybaltovsky ◽  
Evgeniy Epifanov ◽  
Andrey Shubnyi ◽  
Galina Bragina ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Laser Ablation ◽  
Supercritical Carbon Dioxide ◽  
Heterogeneous Catalysts ◽  
Mixing Time ◽  
Laser Wavelength ◽  
Process Conditions ◽  
Metallic Palladium ◽  
Palladium Particles ◽  
Supercritical Carbon

To obtain a supported heterogeneous catalyst, laser ablation of metallic palladium in supercritical carbon dioxide was performed in the presence of a carrier, microparticles of γ-alumina. The influence of the ablation process conditions—including supercritical fluid density, ablation, mixing time of the mixture, and laser wavelength—on the completeness and efficiency of the deposition of palladium particles on the surface of the carrier was studied. The obtained composites were investigated by scanning and transmission electron microscopy using energy dispersive spectroscopy. We found that palladium particles were nanosized and had a narrow size distribution (2–8 nm). The synthesized composites revealed high activity as catalysts in the liquid-phase hydrogenation of diphenylacetylene.

Sign in / Sign up

Export Citation Format

Share Document