Microdesign of nickel-cooper alloy catalysts for
production of new carbon materials
T.V.Reshetenko, L.B.Avdeeva, Z.R.Ismagilov, A.L.Chuvilin, V.A.Likholobov
Boreskov Institute of Catalysis, Pr. Akad. Lavrentieva, 5, Novosibirsk, 630090, Russia
The reaction of methane decomposition was investigated on the Ni-Cu-Al2O3 alloy catalysts at 625-675oC at a gas pressure of 1 bar to produce catalytic filamentous carbon (CFC) with a simultaneous formation of hydrogen. Using Ni-Cu alloy catalysts (8-15 wt.% Cu) at 625oC permits a CFC yield of 525 g/gcat (700 g/gNi). According to the X-ray powder diffraction (XRD) and transmission electron microscopy (TEM) studies of Ni-Cu-Al2O3 catalysts, morphology of catalysts begins to change during 10 minutes after CH4 decomposition by formation of "octopus" CFC structures. It should be noted, that copper additives substantially increase the thermal stability of Ni and modify the textural and structural properties of CFC.