| Summary: | Chemical reduction behavior of NiO under various carbon monoxide (CO) concentration as a reduction agent was studied. The NiO and Ni0 transformations were identified using TPR and XRD techniques. It was shown that a completed reduction occurred at temperature 700 °C with 40% CO while completions occurred at 900 °C with 10% and 20% CO respectively. During the chemical reduction process, nickel carbide was formed at 400 °C and another form of carbon amorphous appeared at 500 °C. The formations were proved through diffraction of XRD pattern at 2θ: 22.86 under 20% CO/N2 and 2θ: 26.15 under 40% CO/N2. The interpretation of physisorption data showed that the pore size after reduction with various CO concentration comprised microporous size in the range of 6-40 nm. Therefore, CO as a mild reduction agent stated that as the concentration of CO high, the rate of reduction affected and formed a very crystalline of Ni0 particle. © 2020 Trans Tech Publications Ltd, Switzerland.
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