ИСТИНА

In this work we studied the influence of CNT oxidation on the morphology and catalytic activity of Co/CNT catalysts. Multiwall CNT were synthesized by catalytic chemical vapor deposition method, then boiled in nitric acid during 1-15 h and studied by BET, Raman spectroscopy, XPS and TGA-MS. Maxima of the defectiveness, BET surface area and surface oxygen content were obtained at 9 h oxidation. Catalysts were prepared using impregnation of Co nitrate ethanol solution for the Co loading of 15 wt. In situ reduced samples (H2, 400oC, 4 h) were tested in CO hydrogenation conditions (220oC, 1 bar, H2:CO=2.1:1, 70 h) in a fix-bed reactor. The dependences of catalytic activity and selectivity from Co/CNT structure were obtained in present work. Reduced catalysts were studied by TEM. It was found that Co particle size decreases and CO conversion increases with increase of oxygen content.