Hydrogen production from oxidative reforming of methane on Ni/γ-Al2O3 catalysts: Effect of support promotion with La, La–Ce and La–Zr (original) (raw)

Fuel Processing Technology, 2014

Abstract

Abstract Ni/Al 2 O 3 catalysts promoted by adding La 2 O 3 , La 2 O 3 –CeO 2 and La 2 O 3 –ZrO 2 were investigated on oxidative and steam reforming aiming the hydrogen production. The samples were characterized by surface area estimation (BET), XRD, TPR, TPD-H 2 and XANES. Analysis of TEM and TPO was performed as complementary characterization for catalysts after reaction. The oxidative steam reforming of methane at temperatures above 500 °C reveals that all the promoted catalysts presented better activities than the unpromoted. Below 500 °C, the catalysts presented deactivation due to metallic nickel species oxidation and the TEM analysis of Ni/Al and Ni/La–Al catalysts revealed that the lanthanum addition led to a decrease in the Ni species particle size and also to a better active phase dispersion. The results suggest that below 500 °C the activity may be related to differences in the metallic area values, although the Ni/La 2 O 3 –Al 2 O 3 catalysts have shown a different behavior.

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