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Preparation Of Cerium Doped Nickel Oxide For Lower Reduction Temperature In Carbon Monoxide Atmosphere

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Preparation Of Cerium Doped Nickel Oxide For Lower Reduction Temperature In Carbon Monoxide Atmosphere.pdf (1005.56 KB)

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2021

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Malaysian Journal of Analytical Sciences

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The reduction behavior of cerium nickel oxide (Ce/NiO) catalyst was investigated by using temperature programmed reduction (TPR) with exposure of 40% (v/v) carbon monoxide (CO) in nitrogen atmosphere as a reductant agent. The Ce/NiO catalysts were prepared by using the conventional impregnation method. The reduction characteristics of NiO to Ni were examined up to 700 ºC and followed by isothermal reduction. The TPR profiles of doped NiO slightly shifted to a lower temperature from 375 to 366 ºC when Ce loading was increased from 3% to 10% (wt./ wt.), respectively. Whereas the undoped NiO was reduced at a higher temperature of 387 ºC. XRD diffractogram of the catalysts showed a complete reduction of NiO to Ni. The interaction between cerium and nickel ions for Ce/NiO series leads to a slight decrease in the reduction temperature. Fine sharp particles of Ce deposited on the NiO surfaces were observed through the FESEM images indicating some morphology modification occurred on NiO. It was found that the addition of 10% (w/w) of Ce on NiO also exhibited a larger BET surface area (11.31 m2g-1) and a smaller average pore diameter (17.7 nm). Based on these results, it is interesting to note that the addition of Ce to NiO has a remarkable influence in reducing the temperature of the reduction process. The 5% Ce/NiO was found sufficient to enhance the reducibility of NiO at a lower temperature.

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Malaysian Journal of Analytical Sciences Vol 25 No 3 (2021): 521 - 531

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reduction, nickel oxide, cerium, carbon monoxide

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https://mjas.analis.com.my/mjas/v25_n3/html/25_3_13.html
 https://www.scopus.com/record/display.uri?eid=2-s2.0-85111029786&origin=resultslist&sort=plf-f&src=s&st1=PREPARATION+OF+CERIUM+DOPED+NICKEL+OXIDE+FOR+LOWER+REDUCTION+TEMPERATURE+IN+CARBON+MONOXIDE+ATMOSPHERE&sid=21b4a1d0b433894fd8003764fc9155f7&sot=b&sdt=b&sl=117&s=TITLE-ABS-KEY%28PREPARATION+OF+CERIUM+DOPED+NICKEL+OXIDE+FOR+LOWER+REDUCTION+TEMPERATURE+IN+CARBON+MONOXIDE+ATMOSPHERE%29&relpos=0&citeCnt=0&searchTerm=
 https://oarep.usim.edu.my/handle/123456789/10491

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