The effects of cobalt and cerium promoters on hydrogen production performance of alumina-supported nickel catalysts in propane steam reforming |
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| Authors: | Amir Azizzadeh Fard Amin Bazyari Seyed Mehdi Alavi Ali Reza Aghamiri |
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| Affiliation: | Catalysis and Nanomaterials Research Laboratory, School of Chemical, Petroleum, and Gas Engineering, Iran University of Science and Technology, Tehran, Iran |
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| Abstract: | BACKGROUND: The effects of Co and Ce promoters on the performance of Ni (10 wt%)–Co (0.0, 2.75, 5.5 wt%)/Ce (0.0, 5.0, 10.0 wt%)–Al2O3 catalysts have been studied for steam reforming of C3H8 (SRP). In this work, Ni (NO3)2 and Co (NO3)2 are co-impregnated on the co-precipitated Al2O3–CeO2 supports. X-ray diffraction, N2 adsorption–desorption, H2-temperature-programmed reduction, high-resolution transmission electron microscopy, scanning electron microscopy and thermogravimetric/differential thermal analysis were accomplished to explain the SRP activity of the catalysts. The performance of the resulting catalysts was evaluated under the gas hourly space velocity (GHSV) = 45 000 mL h-1 gcat−1, T = 600 °C, steam/C3H8 ratio (S/C) = 3 and P = 1 atm. RESULTS: The experimental findings revealed that Ce and Co promoters markedly improved the catalyst activity, stability and H2 yield of Ni/Al2O3 catalyst. The sample with 2.75 wt% Co and 10.0 wt% Ce showed highest C3H8 conversion, while maximum yield of H2 was obtained for catalyst containing 5.5 wt% Co and 5.0 wt% Ce. CONCLUSION: Higher loadings of Co decreased C3H8 conversion and catalyst stability due to more coke formation on the catalyst surface, whereas Ce significantly improved catalyst resistance to coke deposition due to the enhanced Ni metal particles distribution over the support. © 2020 Society of Chemical Industry |
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| Keywords: | steam reforming of propane Ni-based catalyst Co Ce Ni distribution hydrogen |
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