Enhancing hydrogen production by dry reforming process with strontium promoter |
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Authors: | Ahmed A Ibrahim Anis H FakeehaAhmed S Al-Fatesh |
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Affiliation: | Chemical Engineering Department, College of Engineering, P.O. Box 800, Riyadh 11421, Saudi Arabia |
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Abstract: | Hydrogen is an ideal energy carrier and can play a very important role in the energy system. The present study investigated the enhancement of hydrogen production from catalytic dry reforming process. Two catalysts namely Ni/γ-Al2O3 and Co/γ-Al2O3 promoted with different amounts of strontium were used to explore selectivity and yield of hydrogen production. Spent and fresh catalysts were characterized using techniques such as BET, XRD, H2-TPR, CO2-TPD, TGA and O2-TPO. The catalyst activity and characterization results displayed stability improvement due to addition of Sr promoter. The least coke formations i.e. 3.8 wt% and 5.1 wt% were obtained using 0.75 wt% Sr doped in Ni/γ-Al2O3 and 0.5 wt% Sr doped in Co/γ-Al2O3 catalysts respectively. Time on stream tests of promoted catalysts for about six hours at 700 °C showed stable hydrogen selectivity. Moreover, the hydrogen selectivity was significantly improved by the addition of Sr in Ni and Co based catalysts. For instance the hydrogen selectivity increased from 45.9% to 47.8% for Ni/γ-Al2O3 and from 48% to 50.9% for Co/γ-Al2O3 catalyst by the addition of 0.75 wt% Sr in Ni/γ-Al2O3 and 0.5 wt% Sr in Co/γ-Al2O3 catalyst respectively. |
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Keywords: | Dry reforming Cobalt H2 production Nickel Selectivity Yield |
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