Details

Autor(en) / Beteiligte

• Podyacheva, O.Yu
• Ismagilov, Z.R.
• Shalagina, A.E.
• Ushakov, V.A.
• Shmakov, A.N.
• Tsybulya, S.V.
• Kriventsov, V.V.
• Ischenko, A.V.

Titel

Structural changes in a nickel–copper catalyst during growth of nitrogen-containing carbon nanofibers by ethylene/ammonia decomposition

Ist Teil von

• Carbon (New York), 2010-08, Vol.48 (10), p.2792-2801

Ort / Verlag

Kidlington: Elsevier Ltd

Erscheinungsjahr

2010

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Structural changes in a 65Ni–25Cu–Al2O3 catalyst during the decomposition of a C2H4/NH3 mixture at different stages of nitrogen-containing carbon nanofiber (N-CNF) synthesis were studied by X-ray diffraction (XRD) analysis, X-ray diffraction using anomalous scattering effect and extended X-ray absorption fine structure (EXAFS) spectroscopy. The N-CNF growth over a catalyst particle was supposed to proceed via the formation of an oversaturated solid solution of carbon and nitrogen in a nickel-enriched alloy “NiCuxCyNz”. The latter resulted in an increase of the alloy lattice parameter to abnormally large values а=3.616–3.706Å without destruction of its cubic structure. The formation of the “NiCuxCyNz” phase and its presence in the system coincide with the optimum time for the synthesis of N-CNFs with the highest nitrogen concentration and maximum values of specific surface area and total pore volume.