Chemical Reduction Behaviour of NiO under Various Concentration of Carbon Monoxide Using TPR and XRD Techniques

Abstract:

The 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, the completed reduction occurred at temperature 700 °C for 40% CO and 900 °C for 10% and 20% CO. During the chemical reduction process, nickel carbide was formed at temperature 400 °C and another formation of carbon amorphous appeared at 500 °C and proved through diffraction of XRD pattern at 2θ: 22.86 under 20% CO/N₂ and 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 as 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.

• Periodical: Materials Science Forum (Volume 1010)
• Pages: 379-384
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1010.379
• Online since: September 2020
• Authors: Salma Samidin*, Maratun Najiha Abu Tahari, Siti Sarahah Sulhadi, Fairous Salleh, Norliza Dzakaria, Wan Nor Roslam Wan Isahak, Muhammad Rahimi Yusop, Mohd Ambar Yarmo
• Keywords: Carbon, Carbon Monoxide, Catalyst, Reduction

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