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Carbon nanotubes (CNTs) with a carbon content of 3% were synthesized via the disproportionation of CO over a CoMo/SiO2 catalyst. The proposed purification technique consisted of four sequential steps: oxidative treatment, acid leaching, silica dissolution, and froth flotation. The as‐synthesized CNTs were oxidized at 250 °C before being treated with a 5‐m HCl solution at 80 °C and a sonication time...
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