Preparation of Ni–Cu Catalyst for Carbon Nanofiber Production by the Mechanochemical Route

Synthesis of Ni-Cu-CNF Composite Materials via Carbon Erosion of Ni-Cu Bulk Alloys Prepared by Mechanochemical Alloying

“…A further increase in the MCA time to 11 min increases the intensity of peak A and results in its displacement to the high-temperature region. As shown previously [69], the size of the Ni-Cu alloy particles increases at low MCA times and begins to decrease at an MCA time of 3 min and above. As a result, the available surface of the alloy also grows (Table 1), which leads to a higher content of surface oxides.…”

“…During the process, metal particles interact closely with each other, gradually forming an alloy. As was recently reported [69], at the first stages of the MCA procedure, plastic deformation of particles occurs, leading to the formation of layered plates. Then, these plates crumble and form a large number of small fragments of the alloy, which undergo secondary agglomeration.…”

“…The effectiveness of the MCA-prepared Ni-Cu alloys in the decomposition of ethylene involving the CE stage was reported previously [68,69]. It was found that the productivity of the catalyst is mainly influenced by the duration of the MCA procedure.…”

“…According to XRD data, NiO is registered for the Ni-Cu samples after a prolonged MCA procedure (more than 7 min). Note the detailed XRD of similar Ni-Cu samples was reported previously [69].…”

“…The premix sample and the samples after MCA were exposed to contact with the reaction mixture containing ethylene in the reactor equipped with a McBain balance. All experiments were performed at temperature of 550 • C, which was previously shown to be appropriate for the catalytic pyrolysis of ethylene [69]. The weight of the samples increased during the experiment due to the formation of the nanostructured carbon product.…”