Carbon dioxide reforming of methane to synthesis gas over a TiO2–Ni inverse catalyst

Authors:  Hyun Ook Seo, Jong Ki Sim, Kwang-Dae Kim, Young Dok Kim, Dong Chan Lim, Sang Hoon Kim

Abstract:
TiO₂–Ni inverse catalysts were prepared using an atomic layer deposition (ALD) process, and catalytic CO₂ reforming of methane (CRM) reactions over the catalysts (either bare Ni or TiO₂ coated-Ni particles) were performed using a continuous flow reactor at 800 ^◦C. The TiO₂–Ni inverse catalyst had a higher catalytic reactivity at the initial stage of the CRM reaction at 800 ◦C compared to that of bare Ni catalysts. Moreover, the high activity of the TiO₂–Ni catalyst was maintained over 65 h of the CRM reaction at 800 ◦C, whereas deactivation of the bare Ni surface began within 1 h under the same conditions. Surface analysis using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy showed that deposition of graphitic carbon was effectively suppressed in the presence of TiO₂ nanoparticles on the Ni surface, thereby improving the catalytic activity and stability of the TiO₂–Ni catalytic system. We suggest that utilizing the decorative effect of oxide nanoparticles on the surface of metal catalyst has great potential for the development of metal-based catalysts with high stability and reactivity.

Keywords:
CO₂ reforming of methane
Hydrogen
Ni
Inverse catalyst
TiO₂

Published in: Applied catalysis A: General  (Volume 451, Pages 1-288, 31 January 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Carbon dioxide reforming of methane to synthesis gas over a TiO2–Ni inverse catalyst

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