Formation of carbon nanotubes on iron/cobalt-modified zeolites: Effect of zeolite framework/pore structure and method of modification (Journal article)

Karakoulia, S./ Jankovic, L./ Dimos, K./ Gournis, D./ Triantafyllidis, K.

The present Study focuses on the effect of the metal-modification method (ion-exchange or Oil impregnation) and of the type of dealumination procedure (steaming, AHFS) of zeolite the quantity, quality and properties of the carbon nanotubes that are formed on the supported iron or cobalt oxides. Severe dealumination of zeolite-Y by steaming, which induced secondary meso/macropores, resulted in significant decrease in the carbon nanotube formation activity of the metal-impregnated zeolite-Y catalysts, while moderate dealumination by ammonium hexafluorosilicate had a less pronounced effect. The micro-Raman spectra revealed the presence of high quality as-grown CNTs with low degree of disordered.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Μηχανικών Επιστήμης Υλικών
Keywords: y-zeolites,acidic characteristics,catalytic production,dealumination method,fe,aluminum,growth,purification,spectroscopy,vapor
ISSN: 0167-2991
Link: <Go to ISI>://000234827500050
Publisher: Elsevier
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

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