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Received April 29, 2016
Accepted May 31, 2016
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The promotional effect of K on the catalytic activity of Ni/MgAl2O4 for the combined H2O and CO2 reforming of coke oven gas for syngas production
1Hydrogen Laboratory, Korea Institute of Energy Research (KIER), 152 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea 2Department of Chemical & Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea 3, Korea 4Department of Environmental Engineering, Yonsei University, 1 Yonseidae-gil, Wonju, Gangwon-do 26493, Korea
Korean Journal of Chemical Engineering, November 2016, 33(11), 3115-3120(6), 10.1007/s11814-016-0149-8
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Abstract
A K-promoted 10Ni-(x)K/MgAl2O4 catalyst was investigated for the combined H2O and CO2 reforming (CSCR) of coke oven gas (COG) for syngas production. The 10Ni-(x)K/MgAl2O4 catalyst was prepared by co-impregnation, and the K content was varied from 0 to 5 wt%. The BET, XRD, H2-chemisorption, H2-TPR, and CO2-TPD were performed for determining the physicochemical properties of prepared catalysts. Except under the condition of a K/Ni=0.1 (wt%/wt%), the Ni crystal size and dispersion decreased with increasing K/Ni. The coke resistance of the catalyst was investigated under conditions of CH4 : CO2 : H2 : CO : N2=1 : 1 : 2 : 0.3 : 0.3, 800 ℃, 5 atm. The coke formation on the used catalyst was examined by SEM and TG analysis. As compared to the 10Ni/MgAl2O4 catalyst, the Kpromoted catalyst exhibited superior activity and coke resistance, attributed to its strong interaction with Ni and support, and the improved CO2 adsorption characteristic. The 10Ni-1K/MgAl2O4 catalyst exhibited optimum activity and coke resistance with only 1wt% of K.
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