Dry reforming of methane (DRM) is an endothermic reaction and the catalysts used for studying this reaction are unsubstituted lanthanum zirconate (LZ), Rh substituted LRhZ (2 wt%) and LRhZ (5 wt%) pyrochlores. In-situ FTIR studies in CO2 and CH4 were conducted on these three catalysts. The FTIR spectra obtained were then analyzed for the formation of carbonates and formates during DRM reaction. Lanthanum oxide (La2O3) and zirconium oxide (ZrO2) were used as standards for analyzing the carbonate formation over the pyrochlores. It was observed that the absorption spectra of the lanthanum oxide carbonates were very similar to carbonates formed on LZ. There were no observable carbonates formed on zirconia. This suggests that the active site for activation of CO2 is the lanthanum phase of LZ. Lanthanum oxide forms carbonate which then oxidize activated CH4 during the DRM reaction.

FTIR studies of Rh substituted lanthanum zirconate (La2Zr2O7) pyrochlores for CO2 reforming of CH4

245th National Meeting (2013)

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