Effect of Mo on the catalytic activity of Ni-based self-organizing catalysts for processing of dichloroethane into segmented carbon nanomaterials

Yury I Bauman; Yulia V Rudneva; Ilya V Mishakov; Pavel E Plyusnin; Yury V Shubin; Denis V Korneev; Vladimir O Stoyanovskii; Aleksey A Vedyagin; Roman A Buyanov

doi:10.1016/j.heliyon.2019.e02428

Effect of Mo on the catalytic activity of Ni-based self-organizing catalysts for processing of dichloroethane into segmented carbon nanomaterials

Heliyon. 2019 Sep 7;5(9):e02428. doi: 10.1016/j.heliyon.2019.e02428. eCollection 2019 Sep.

Authors

Yury I Bauman¹, Yulia V Rudneva², Ilya V Mishakov^{1

3}, Pavel E Plyusnin^{2

3}, Yury V Shubin^{2

3}, Denis V Korneev⁴, Vladimir O Stoyanovskii¹, Aleksey A Vedyagin^{1

5}, Roman A Buyanov¹

Affiliations

¹ Boreskov Institute of Catalysis, pr. Lavrentieva 5, Novosibirsk, 630090, Russia.
² Nikolaev Institute of Inorganic Chemistry, pr. Lavrentieva, Novosibirsk, 630090, Russia.
³ Novosibirsk State University, Pirogova Str. 2, Novosibirsk, 630090, Russia.
⁴ Monash University, Melbourne, 3800, Australia.
⁵ National Research Tomsk Polytechnic University, pr. Lenina 30, Tomsk 634050, Russia.

Abstract

A series of micro-disperse Ni-Mo alloys with the sponge-like structure was prepared by a simultaneous precipitation method followed by sintering of the sediment in H₂ atmosphere at 800 °C. According to XRD data, the formation of single-phase solid solution Ni_1-xMo_x took place for the samples with Mo content of 0.6-8.3 wt.%. Synthesized samples were studied in a process of the catalytic CVD of C₂H₄Cl₂ at 550-700 °C. In situ kinetic studies of carbon deposition process were carried out in a flow gravimetric setup equipped with McBain balances. An interaction of Ni-Mo alloys with C₂H₄Cl₂ is accompanied by their rapid disintegration with formation of disperse active particles catalyzing the growth of carbon nanomaterials (CNM). The strong boosting effect of Mo on the catalytic performance of Ni was revealed. The maximum yield of CNM product (8.3 wt.% Mo, 600 °C, 120 min) was as high as 45 g/g_M. The study on effect of the reaction temperature on the CNM yield allowed one to define an optimal temperature regime. The impact of Mo concentration upon the morphology, structural features and textural properties of the produced carbon fibers was investigated by means of SEM, TEM, Raman spectroscopy and low-temperature nitrogen adsorption. The role of chemisorbed chlorine species in a pulse-to-pulse regime of the segmented carbon filaments formation was discussed.

Keywords: Bulk Ni-Mo alloy; Carbon nanofibers; Catalysis; Heterogeneous catalysis; Heterogeneous methods; Kinetics of carbon deposition; Materials science; Segmented structure; Self-disintegration; Self-organizing catalysts.