In this work is presented a study of the shelf life of an iron-impregnated MgO (Fe/MgO) sample and an explanation of the effect of its aging on morphology and electroactivity of nitrogen-doped carbon nanostructures prepared by using this catalyst at different ages. Characterizations of Fe/MgO by thermogravimetric analysis (TGA), temperature-programmed desorption mass spectroscopy (TPD-MS), high-resolution X-ray powder diffraction (HR-XRPD), and X-ray photoelectron spectroscopy (XPS) have been performed at different aging times. The catalyst is formed by crystalline MgO, Mg(OH)2, and FeO phases. During aging, CO2 adsorption induces the formation of amorphous carbonate, resulting in a decrease of specific surface area, a redistribution of porosity, a reduction of the iron percentage at the surface, and an increase of iron oxide particle size. Different surface and bulk properties are used to explain different morphologies and electroactivities of the nitrogen-doped carbon nanotubes synthesized at different catalyst aging times. The importance of a careful characterization of the catalyst as a function of shelf life, to optimize the synthesis and the morphology of the nitrogen-doped carbon nanotubes, is pointed out.
Catalyst Shelf Life : Its Effect on Nitrogen-Doped Carbon Nanotubes / S. Marzorati, R. Bresciani, S. Checchia, S. Antenucci, B. Sacchi, V. Dal Santo, M. Scavini, M. Longhi. - In: JOURNAL OF PHYSICAL CHEMISTRY. C. - ISSN 1932-7447. - 121:30(2017), pp. 16415-16422.
|Titolo:||Catalyst Shelf Life : Its Effect on Nitrogen-Doped Carbon Nanotubes|
MARZORATI, STEFANIA (Primo)
SCAVINI, MARCO (Penultimo)
LONGHI, MARIANGELA (Corresponding)
|Parole Chiave:||Electronic, Optical and Magnetic Materials; Energy (all); Surfaces, Coatings and Films; Physical and Theoretical Chemistry|
|Settore Scientifico Disciplinare:||Settore CHIM/02 - Chimica Fisica|
|Data di pubblicazione:||2017|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1021/acs.jpcc.7b05037|
|Appare nelle tipologie:||01 - Articolo su periodico|