Ni–CeO2–ZrO2 Catalysts for Water Gas Shift Reaction: Effect of CeO2 Contents and Reduction Temperature
Ni–CeO2–ZrO2 catalysts with 5 wt% of Ni and different amounts of CeO2 were prepared by an incipient wetness impregnation. The synthesized materials were tested for their activities for the water gas shift reaction (WGS) which was carried
out at 200–400 °C with the reactants consisting of 3% CO and 7% H2O. The effect of reduction temperatures (350, 400 and 500 °C) and amount of CeO2 (0–20 wt%) on the CO2 conversion were investigated. The prepared catalysts were characterized
their physical and chemical properties via X-ray Diffraction, N2 physisorption, H2 chemisorption and in situ diffuse reflection infrared Fourier transform spectroscopy (DRIFTS). It was found that the reduction temperature and loaded CeO2 content affected
the surface area and dispersion of metal. Moreover, based on DRIFTS study, the formate species were found to be the important intermediates in the WGS reaction. The highest conversion of CO2 at 71% was achieved when using Ni–CeO2–ZrO2 with 10% CeO2
reduced at 400 °C.
Keywords: Catalysts; Cerium Oxide; Nickel; WGS; Zirconium Oxide
Document Type: Research Article
Affiliations: 1: Department of Chemical Engineering, Kasetsart University, Jatujak, Bangkok 10900, Thailand 2: Institute of Materials Chemistry/Physical Chemistry Division, Vienna University of Technology, Getreidemarkt 9/1060 Vienna, Austria
Publication date: 01 December 2016
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