TY - JOUR

T1 - Carbon Erosion of a Bulk Nickel–Copper Alloy as an Effective Tool to Synthesize Carbon Nanofibers from Hydrocarbons

AU - Mishakov, I. V.

AU - Afonnikova, S. D.

AU - Bauman, Yu I.

AU - Shubin, Yu V.

AU - Trenikhin, M. V.

AU - Serkova, A. N.

AU - Vedyagin, A. A.

N1 - Funding Information: This work was supported by the Ministry of Science and Higher Education of the Russian Federation within the framework of a state task to Boreskov Institute of Catalysis of the Siberian Branch of the Russian Academy of Sciences (project no. AAAA-A21-121011390054-1). The alloy samples were synthesized within the framework of a project of the Russian Foundation for Basic Research (project no. 18-29-19053-mk). Funding Information: The authors thank A.B. Ayupov for his assistance in the texture analysis of the CNF samples. The physicochemical properties of the samples were analyzed using the equipment of the Center for collective use "National Center for Research of Catalysts" and the Omsk Regional Center for collective use of the Siberian Branch of the Russian Academy of Sciences. Publisher Copyright: © 2022, The Author(s).

PY - 2022/2

Y1 - 2022/2

N2 - Carbon erosion of bulk metals and alloys in a carbon-containing atmosphere can be used as an effective tool for the targeted synthesis of carbon nanomaterials. In this study, a set of bulk Ni0.89Cu0.11 (11 at % Cu) alloys has been synthesized by the mechanochemical alloying of metal powders in an Activator 2S planetary mill. The synthesized samples have been studied as precursors of catalyst for the synthesis of carbon nanofibers (CNFs) from ethylene at 550°C. The effect of the activation time on the particle morphology and phase composition of the alloys, the kinetics of growth, and the carbon product yield in C2H4 decomposition has been studied. For the most active samples, the CNF yield has exceeded 100 g/gcat within 30 min of reaction. The early stage of carbon erosion of a bulk Ni0.89Cu0.11 alloy has been studied by electron microscopy methods. It has been found that the nucleation of carbon fiber growth active sites occurs during a short-term contact of the sample with the reaction mixture (less than 1 min); the complete disintegration of the alloy is observed in a few minutes. The carbon product is represented by nanofibers having a submicrometer diameter and characterized by a dense “stacked” and coaxial-conical packing of graphene layers. The material has a developed specific surface area (140–170 m2/g) and a low bulk density (less than 30 g/L).

AB - Carbon erosion of bulk metals and alloys in a carbon-containing atmosphere can be used as an effective tool for the targeted synthesis of carbon nanomaterials. In this study, a set of bulk Ni0.89Cu0.11 (11 at % Cu) alloys has been synthesized by the mechanochemical alloying of metal powders in an Activator 2S planetary mill. The synthesized samples have been studied as precursors of catalyst for the synthesis of carbon nanofibers (CNFs) from ethylene at 550°C. The effect of the activation time on the particle morphology and phase composition of the alloys, the kinetics of growth, and the carbon product yield in C2H4 decomposition has been studied. For the most active samples, the CNF yield has exceeded 100 g/gcat within 30 min of reaction. The early stage of carbon erosion of a bulk Ni0.89Cu0.11 alloy has been studied by electron microscopy methods. It has been found that the nucleation of carbon fiber growth active sites occurs during a short-term contact of the sample with the reaction mixture (less than 1 min); the complete disintegration of the alloy is observed in a few minutes. The carbon product is represented by nanofibers having a submicrometer diameter and characterized by a dense “stacked” and coaxial-conical packing of graphene layers. The material has a developed specific surface area (140–170 m2/g) and a low bulk density (less than 30 g/L).

KW - bulk alloys

KW - carbon erosion

KW - carbon nanofibers

KW - copper

KW - ethylene

KW - mechanochemical alloying

KW - nickel

UR - http://www.scopus.com/inward/record.url?scp=85127104533&partnerID=8YFLogxK

UR - https://elibrary.ru/item.asp?id=47696556

UR - https://www.mendeley.com/catalogue/85ef62c7-7d72-3ae7-9478-845d6dceac6a/

U2 - 10.1134/S0023158422010049

DO - 10.1134/S0023158422010049

M3 - Article

AN - SCOPUS:85127104533

VL - 63

SP - 97

EP - 107

JO - Kinetics and Catalysis

JF - Kinetics and Catalysis

SN - 0023-1584

IS - 1

ER -