CH4–CO2 reforming over Ni-substituted barium hexaaluminate catalysts

Authors: Todd H. Gardner, James J. Spivey, Edwin L. Kugler, Devendra Pakhare

Abstract:
A series of Ni-substituted barium hexaaluminate catalysts, Ba_0.75NiyAl_12−yO_19−ı (y = 0.4, 0.6 and 1.0), were tested for CO₂ reforming of CH₄ at temperatures between 200 and 900^◦C. Temperature programmed surface reaction results show thatthe reaction lights-offin a temperature range between 448 and 503^◦C with a consistent decrease in light-offtemperature with increasing Ni substitution. Isothermal runs performed at 900 ◦C show near equilibrium conversion and stable product concentrations for 18 h on all catalysts. Temperature programmed oxidation of the used catalysts show that the amount of carbon deposited on the catalyst increases with Ni substitution. High resolution XRD of the used Ba_0.75Ni_0.4Al_11.6O_19−ı catalyst shows a statistically significant contraction of the unit cell which is the result of NiO reduction from the lattice. XRD of the used catalyst also confirms the presence of graphitic carbon. XPS and ICP measurements of the as prepared catalysts show that lower levels of Ni substitution result in an increasing proportion of Ba at the surface.

Keywords:
Ni-substituted hexaaluminate
Methane dry reforming
Syngas
Carbon dioxide
Green house gas

Published in: Applied catalysis A: General  (Volume 455, Pages 1-266, 30 March 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

CH4–CO2 reforming over Ni-substituted barium hexaaluminate catalysts

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