Norliza DzakariaAzizul Hakim LahuriFairous SallehTengku Shafazila Tengku SaharuddinAlinda SamsuriMohd Ambar Yarmo2024-05-292024-05-2920232024-2-19Dzakaria, N., Lahuri, A. H., Salleh, F., Tengku Saharuddin, T. S., Samsuri, A., & Yarmo, M. A. (2023). Effect of Transition Metals Addition on the Nickel Oxide Catalyst toward Reduction Behaviour in Carbon Monoxide Atmosphere. Pertanika Journal of Science and Technology, 31(4). https://doi.org/10.47836/pjst.31.4.070128-768010.47836/pjst.31.4.07http://www.pertanika.upm.edu.my/resources/files/Pertanika%20PAPERS/JST%20Vol.%2031%20(4)%20Jul.%202023/07%20JST-3779-2022.pdfhttps://www.scopus.com/record/display.uri?eid=2-s2.0-85164171639&origin=resultslist&sort=plf-f&src=s&sid=47f412d7a706a0fe380d40dc39bea717&sot=b&sdt=b&s=TITLE-ABS-KEY%28Effect+Of+Transition+Metals+Addition+On+The+Nickel+Oxide+Catalyst+Toward+Reduction+Behaviour+In+Carbon+Monoxide+Atmosphere%29&sl=114&sessionSearchId=47f412d7a706a0fe380d40dc39bea717&relpos=0https://oarep.usim.edu.my/handle/123456789/10794Volume 31, Issue 4The chemical reduction progression behaviour of transition metals (Mo, Zr, W, Ce, and Co) doped on NiO was studied using temperature programmed reduction (TPR) analysis. A wet impregnation method was applied to synthesise the doped NiO series catalysts. The reduction progress of the catalysts was attained by using a reductant gas at the concentration of 40% v/v CO/N2. X-ray diffraction (XRD) was employed to determine the composition of the reduced phases. Undoped NiO was reduced at 384℃ to obtain a cubic phase of NiO. It was observed that Ce/NiO exhibited the lowest reduction temperature of 370℃ among all catalysts. This phenomenon might be due to a higher surface area of Ce/NiO compared to undoped NiO, which facilitated a faster reduction reaction. The rest of the doped NiO series catalysts (Co/NiO, Mo/NiO, W/NiO and Zr/NiO) demonstrated a higher reduction temperature compared to undoped NiO. New peaks in the XRD pattern were observed only for the reduced catalysts of Mo/NiO and W/NiO, which were associated with monoclinic MoO2 and WO2.72 phases, respectively. The formation of new compounds or more stable nickel alloys led to a slower reduction reaction than undoped NiO. Therefore, Ce/NiO was the most efficient catalyst in promoting the formation of Ni under the CO atmosphere.en-USCarbon monoxide, metal oxide, nickel oxide, nickel, reductionArticle17171729314