Electronic Structure of Bilayer (Fe, Ni) Metallic α-Al2O3(0001) Catalysts Towards CH4 Adsorption and Dissociation

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Density functional theory calculations are performed on the monometallic (Fe or Ni) bilayer modified α-Al2O3(0001) surface. Comparison has been made to their structural and electronic behaviors upon CH4 adsorption and dissociation. Local density of states and frontier orbital analysis show that C-H activation proceeds through weak chemical interactions with the metallic 3d electrons. It was found that electron transport within the sp and 3d type orbitals of the catalyst is important for the equilibration of the system. Such electron transport also promotes electron donation to the σ*(C-H) antibonding orbital for C-H bond activation. The calculated adsorption energies showed that the CH+H intermediate is most stable on the Fe/α-Al2O3 catalyst and is suspect to deactivation via carburization. Furthermore, C-H bond activation is most pronounced in cases where the CH4 molecule has one or two H atoms directed towards the catalyst surface.

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Periodical:

Materials Science Forum (Volumes 654-656)

Main Theme:

Edited by:

Jian-Feng Nie and Allan Morton

Pages:

2747-2750

DOI:

10.4028/www.scientific.net/MSF.654-656.2747

Citation:

K. Wong et al., "Electronic Structure of Bilayer (Fe, Ni) Metallic α-Al2O3(0001) Catalysts Towards CH4 Adsorption and Dissociation", Materials Science Forum, Vols. 654-656, pp. 2747-2750, 2010

Online since:

June 2010

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$35.00

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