Effect of Ce on the structural features and catalytic properties of La(0.9-x)CexFeO3 perovskite-like catalysts for the high temperature water-gas shift reaction

La(0.9-x)CexFeO3 perovskite-like catalysts were investigated for the production of hydrogen from simulated coal-derived syngas via the water gas shift reaction in the temperature range 450-600 degrees C and at 1 atm. These catalysts exhibited higher activity at high temperatures (T >= 550 degrees C), compared to that of a commercial high temperature iron chromium catalyst at 450 C. Addition of a low Ce content (x = 0.2), has little influence on the formation of the LaFeO3 perovskite structure, but enhances catalytic activity especially at high temperatures with 19.17% CO conversion at 550 degrees C and 40.37% CO conversion at 600 degrees C. The LaFeO3 perovskite structure and CeO2 redox properties play an important role in enhancing the water-gas shift activity. Addition of a high Ce content (x = 0.6) inhibits the formation of the LaFeO3 perovskite structure and decreases catalyst activity. Crown Copyright (C) 2010 Published by Elsevier Ltd on behalf of Professor T. Nejat Veziroglu. All rights reserved.