Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1682384 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms | 2015 | 5 Pages |
Abstract
All “as-prepared” composites were examined for catalytic activity using reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) by sodium borohydride as a common reaction to test metallic nanostructures catalysts. The effect of temperature on the catalytic activity was investigated in range of 292-313Â K and activation energy were calculated. Kapp of Ag/PET composites linearly increase with an increase of the temperature thus normal Arrhenius behavior have been seen and the activation energy was calculated to be 42.13Â kJ/mol. Au/PET composites exhibit not only more powerful catalytic activity but also non-linear dependence of rate constant from temperature. Kapp increased with increasing temperature throughout the 292-308Â K temperature range; the reaction had an activation energy 65.32Â kJ/mol. In range 311-313Â K rate constant dramatically decreased and the apparent activation energy at this temperature rang was â91.44Â kJ/mol due some structural changes, i.e. agglomeration of Au nanoparticles on the surface of composite.
Related Topics
Physical Sciences and Engineering
Materials Science
Surfaces, Coatings and Films
Authors
Anastassiya Mashentseva, Daryn Borgekov, Sergey Kislitsin, Maxim Zdorovets, Anastassiya Migunova,