Details

Autor(en) / Beteiligte

• Shalagina, Anastasia E.
• Ismagilov, Zinfer R.
• Podyacheva, Olga Yu
• Kvon, Ren I.
• Ushakov, Vladimir A.

Titel

Synthesis of nitrogen-containing carbon nanofibers by catalytic decomposition of ethylene/ammonia mixture

Ist Teil von

• Carbon (New York), 2007-08, Vol.45 (9), p.1808-1820

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2007

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The formation of carbon nanofibers (CNFs) doped with nitrogen was investigated during decomposition of C 2H 4/NH 3 mixtures at 450–675 °C over metal catalysts: 90Ni–Al 2O 3, 82Ni–8Cu–Al 2O 3, 65Ni–25Cu–Al 2O 3, 45Ni–45Cu–Al 2O 3, 90Fe–Al 2O 3, 85Fe–5Co–Al 2O 3, 62Fe–8Co–Al 2O 3, 62Fe–8Ni–Al 2O 3. It was found that the yield of CNFs, their structural and textural properties, as well as nitrogen content in CNFs are strongly dependent on the synthesis conditions such as: catalyst used, feed composition, temperature and duration. The 65Ni–25Cu–Al 2O 3 was proved to be the most efficient catalyst for the production of nitrogen-containing carbon nanofibers (N-CNFs) with nitrogen content up to 7 wt.%. Ammonia concentration in the feed equal 75 vol.%, temperature 550 °C and duration 1 h were found to be the optimum reaction parameters to reach the maximum nitrogen content in N-CNFs. TEM studies revealed that the nanofibers have a helical morphology and a “herringbone” structure composed of graphite sheets. According to the XPS data, the nitrogen incorporation in the N-CNF structure leads to the formation of two types of nitrogen coordination: pyridinic and quaternary, and their abundance depends on the reaction conditions.