A correlation between structural changes in a Ni-Cu catalyst during decomposition of ethylene/ammonia mixture and properties of nitrogen-doped carbon nanofibers

作者：Podyacheva O Yu^*; Shmakov A N; Boronin A I; Kibis L S; Koscheev S V; Gerasimov E Yu; Ismagilov Z R

来源：Journal of Energy Chemistry, 2013, 22(2): 270-278.

DOI：10.1016/S2095-4956(13)60033-9

• carbon nanofibers
• nitrogen-doped carbon nanofibers
• XRD in situ
• XPS
• catalyst

Changes of a 65Ni25Cu10Al(2)O(3) catalyst consisting of Ni-enriched and Cu-enriched alloys were investigated in the bulk and on the surface during the growth of nitrogen-doped carbon nanofibers (N-CNFs) by decomposition of a 50%C2H4/50%NH3 mixture using in situ X-ray diffraction (XRD) analysis, ex situ X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) techniques. It was shown that N-CNF growth at 450-650 degrees C is accompanied by dissolution of carbon and nitrogen in the Ni-enriched alloy, whereas Cu-enriched alloy remains inactive. A correlation between nickel and copper surface concentrations and properties of N-CNFs in relation to the nitrogen content was found. It was demonstrated that phase composition of the catalyst during N-CNF growth determines the type of N-CNFs structure.

• 出版日期2013-3