Comparative study of 1,2-dichlorethane decomposition over Ni-based catalysts with formation of filamentous carbon

• Published in: Catalysis today 2018-03, Vol.301, p.147-152
• Main Authors: Bauman, Yurii I., Mishakov, Ilya V., Korneev, Denis V., Shubin, Yury V., Vedyagin, Aleksey A., Buyanov, Roman A.
• Format: Article
• Language: English
• Subjects: Carbon nanomaterials; CCVD; Mechanochemical activation; Metal dusting; Nickel alloys; Segmented structure
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2017.05.015

[Display omitted] •Catalytic chemical vapor deposition of C2H4Cl2 over Ni-based catalysts was studied.•Catalysts prepared by metal dusting of bulk alloys show highest carbon yield.•Carbon deposits are characterized by segmented structure and developed surface area.•Bulk chlorination and surface blockage with carbon result in catalyst deactivation. Catalytic chemical vapor deposition of 1,2-dichlorethane over Ni-based catalysts into carbon nanostructured materials was studied. The catalysts were prepared by mechanochemical activation and by metal dusting of bulk nickel-containing alloy precursors. Model Ni-M alloys, where M is Co, Cu, and Fe, were obtained by coprecipitation technique. Loading of M in the samples was varied in a range of 1–5at.%. Pure nickel was used a reference. The kinetics of carbon deposition was investigated using flow reactor equipped with McBain balances. The samples of carbon product were characterized by nitrogen adsorption, scanning and transmission electron microscopies. The hydrogen addition into reaction mixture was shown to have opposite effect on both catalytic behavior and carbon yield depending on catalyst’s nature. Segmented structure of carbon filaments formed specifies its developed surface area. Both bulk chlorination of nickel particles and its blockage by dense carbon deposits in the case of mechanochemically prepared samples were suggested to be responsible for rapid deactivation of the catalyst.