Abstract
The Pr-doped ceria supported ruthenium catalyst Ru/CeO2-PrO2 for ammonia synthesis was prepared by a redox co-precipitation method. The obtained catalyst samples were characterized by N2 physisorption, X-ray diffraction, H2 temperature-programmed reduction, CO chemisorption, temperature-programmed desorption of nitrogen, field-emission scanning electron microscopy, high resolution transmission electron microscopy, and X-ray photoelectron spectroscopy. The effects of Pr doping amount on the microstructure and catalytic properties of Ru/CeO2-PrO2 were investigated. The results showed that the composite oxide created form Pr-doped ceria has some influence on the Ru dispersion and surface texture. The activity test showed that the ammonia synthesis transformation frequency over the Ru/CeO2-PrO2 catalyst with 4% Pr was 12.13 × 10–2 s–1 at 10 MPa, 10000 h–1, and 425 oC, which was 58% higher than that of Ru/CeO2. The improvement of electrical conductivity performance is the key factor for the higher catalytic activity.
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