Carbon dioxide reforming of methane over lanthanum-modified catalysts in a fluidized-bed reactor

Abstract Nickel on lanthanum-modified aluminas were prepared and tested as catalysts for the CO 2 + CH 4 ⇔ 2CO + 2H 2 reaction in a fluidized-bed reactor. Attrition tests show that lanthanum increases the strength of the carrier significantly. TPR and XRD results indicate that nickel enters into positions in the Al-O spinel blocks of the subsurface LaAl 12 O 19 phase. This results in lower reducibility and thus lower activity for the reforming reaction as compared to nickel on unmodified alumina. While the unmodified catalyst deactivated rapidly under the chosen test conditions, the modified catalysts seem to be stable over several hours. However, the stability is sensitive to the pretreatment conditions of the catalysts.

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