Abstract: Chlorinated hydrocarbons (CHCs) and related wastes are known to be hazardous substances for environment and human health. Catalytic processing of CHCs into carbon nanomaterial (СNM) attracts much attention as an effective way of organochlorine waste disposal. Here we report an effect of Pt on catalytic activity of Ni in decomposition of 1,2-dichloroethane (DCE) as well as upon the structure of produced CNM. Series of sponge-like alloys Ni-Pt (1-25 at.%) was prepared by co-precipitation technique followed by sintering in H2 at 800°С. Formation of Ni-Pt alloys was proved by XRD data. Samples of bulk alloys were then used as precursors for the self-organizing catalysts (SOCs) Formation of SOCs took place in reaction atmosphere (DCE/H2/Ar = 7/37/56, vol.%) during the decomposition of DCE at 550-700°С as a result of rapid disintegration of Ni-Pt alloys. Disintegration has let to emergence of disperse metallic particles which are functioning as active centres for CHCs decomposition with production of CNM. Introduction of Pt into Ni-alloy was shown to have stabilizing effect on catalytic activity and stability of nickel. Best performing Ni-Pt catalysts were successfully tested for catalytic processing of real organochlorine wastes reproduced by mixture of aliphatic chlorinated hydrocarbons. It was established that produced carbon filaments are characterized with well-expressed segmental structure in which the blocks of densely and loosely packed graphenes are regularly stacked. More characteristics of segmented CNFs examined by Raman, BET and XPS, as well as mechanistic aspects of their formation, will be discussed in detail.

Cite: Mishakov I.V. , Bauman Y.I. , Rudneva Y.V. , Rieder D. , Shubin Y.V. , Korneev D.V. , Dʹyachkova S.G. , Vedyagin A.A.
Processing of Organochlorine Waste over Self-Organizing Ni-Pt Catalysts with Formation of Segmented Carbon Nanofibers
International Conference on Applied Catalysis & Chemical Engineering 08-10 Apr 2019