N-containing fibrous carbon material prepared by decomposition of CH4/H-2/pyridine mixtures over Ni-Cu catalysts has been studied by X-Ray Photoelectron Spectroscopy (XPS) and Transmission Electron Microscopy (TEM). The essential effect of the decomposition temperature (in the range of 820-1020 K) and reaction mixture composition on the nitrogen content, its chemical state and the texture of produced carbon filaments was found.