Journal
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
Volume 36, Issue 4, Pages 1587-1600Publisher
BRAZILIAN SOC CHEMICAL ENG
DOI: 10.1590/0104-6632.20190364s20190251
Keywords
Carbon nanotube; Chemical vapor deposition; Purification
Categories
Funding
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) [001]
- Fundacao de Amparo a Pesquisa do Estado do Rio de Janeiro (FAPERJ)
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CoMo/MgO catalysts with low loading of cobalt and molybdenum were prepared by incipient wetness impregnation and the sol-gel method for high yield production of carbon nanotubes (CNT). A detailed characterization of the catalysts, as-produced CNT and purified CNT, indicated a relationship between carbon nanotube properties, synthesis and purification steps. Excess of molybdenum in the catalyst caused a decrease in carbon yield and produced CNT with a lower degree of graphitization. Catalysts prepared by the sol-gel method and with higher molybdenum loading showed an improved interaction between cobalt and molybdenum, increasing the formation of CoMoO4, which was not completely removed during the purification step. The purification removed all MgO and part of the cobalt and molybdenum present in samples without significant damage to the CNT structure. An increase in sample purity could be achieved by increasing reaction time.
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