Abstract
Abstract FeOx-promoted Cu/Al2O3 catalysts active for low-temperature water–gas-shift (LT-WGS) reaction, reported previously (H. Yahiro, K. Sagata, T. Yamamoto, K. Saiki, M. Asamoto, H. Yamaura, Catal. Lett.2008, 124, 233.), were characterized by TPR, TPO, XRD, and XPS measurements. These techniques proved that Fe2O3 was partially reduced by H2 to Fe3O4 at 573 K in the presence of Cu0 and that the obtained Fe3O4 was reoxidized by O2 at the same temperature. The pronounced effect of Fe addition to Cu/Al2O3 on the catalytic activity for WGS reaction was observed at 523–623 K. It is concluded that partially reduced Fe2O3, probably Fe3O4, acts as an active site for LT-WGS reaction in the addition to Cu0, resulting in the improvement of the catalytic activity at 523–623 K.
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