Reduction Kinetics of Co3O4 Powders by Hydrogen Plasma and Hydrogen Gas at Low Temperatures
Maria Cristina Yukiko Nakayama,
Estefano Aparecido Vieira,
Ramiro Conceição Nascimento
et al.
Abstract:The reduction of cobalt oxide (Co 3 O 4 ) powders was studied using hydrogen plasma (HP) and hydrogen gas at low temperatures. The reduction experiments were performed in a pulsed plasma reactor at 540 V, 532 Pa, under atmospheres of 100% hydrogen at a flow rate of 300 cm 3 /min, with varying times up to 60 min, and temperature range of 523-653 K. The results showed that the reduction of Co 3 O 4 powders occurs in two steps: Co 3 O 4 → CoO → Co, when using either HP or hydrogen gas. At lower temperatures, hydr… Show more
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