Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.apcata.2011.08.037
Title: Effect of calcium addition on catalytic ethanol steam reforming of Ni/Al2O3: I. Catalytic stability, electronic properties and coking mechanism
Authors: Choong, C.K.S.
Zhong, Z.
Huang, L.
Wang, Z.
Ang, T.P.
Borgna, A.
Lin, J.
Hong, L. 
Chen, L.
Keywords: Calcium oxide
Coke mechanism
Ethanol
Nickel catalyst
Stability
Steam reforming
Surface OH groups
Water adsorption
Issue Date: 4-Nov-2011
Citation: Choong, C.K.S., Zhong, Z., Huang, L., Wang, Z., Ang, T.P., Borgna, A., Lin, J., Hong, L., Chen, L. (2011-11-04). Effect of calcium addition on catalytic ethanol steam reforming of Ni/Al2O3: I. Catalytic stability, electronic properties and coking mechanism. Applied Catalysis A: General 407 (1-2) : 145-154. ScholarBank@NUS Repository. https://doi.org/10.1016/j.apcata.2011.08.037
Abstract: Ca-modified Ni/Al2O3 catalysts with various Ca loadings of 0, 3, 5 and 7 wt% were studied for low temperature catalytic ethanol steam reforming (ESR). Catalyst with 3 wt% of Ca remains stable at 673 K for at least 24 h, while 0 wt%, 5 wt% and 7 wt% Ca modified catalysts deactivate easily. The addition of Ca increases the particle size of active Ni which promotes the formation of un-reactive and encapsulating carbons, undermining the stability of highly loaded (7 wt%) Ca-modified Ni catalyst. XPS valence band shows that the presence of Ca increases the density of Ni 3d band valence electrons which helps in dissociation of methane and deactivates the catalysts, as in the case of nickel catalysts supported on 7 wt% of Ca on Al 2O3. Excellent catalytic performance of 10Ni/3Ca-Al 2O3 is due to the effective coke removal and the amorphous nature of coke deposition. Optimized Ca loading was found to play a critical role in coke removal, through its effect on Ni particle size, valence band of catalyst and steam gasification of coke. © 2011 Elsevier B.V. All rights reserved.
Source Title: Applied Catalysis A: General
URI: http://scholarbank.nus.edu.sg/handle/10635/88789
ISSN: 0926860X
DOI: 10.1016/j.apcata.2011.08.037
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