کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1272628 | 1497484 | 2014 | 8 صفحه PDF | دانلود رایگان |
• Fe–Ce chemical interaction could counteract sintering of materials.
• Fe–Ce mixed oxides decreased the reaction temperatures of redox process.
• Ce–Fe mixed oxides showed good activity for hydrogen production.
The chemical hydrogen storage (hydrogen reduction) and production (water splitting) behaviour of Ce-modified Fe2O3 mixed oxides were investigated. Fe1−xCexO2−δ (x = 0, 0.05, 0.1, 0.2, 0.3, 0.4 and 1) oxides prepared by chemical precipitation were characterized by XRD (X-ray diffraction), H2-TPR (hydrogen temperature-programmed reduction) and H2O-TPO (steam temperature-programmed oxidation) tests. XRD results showed that two kinds of Fe–Ce–O solid solutions (Ce-based and Fe-based) coexisted in Fe–Ce mixed oxides. H2-TPR experiment suggested that Ce addition could reduce hydrogen reduction temperature while H2O-TPO experiments over reduced oxides showed that Fe–Ce mixed oxides could split water to produce hydrogen at a lower temperature and complete in a shorter time. Both redox reactions (hydrogen reduction and water splitting) were sensitive to the temperature and active at a high temperature. The successive redox cycles were carried out over the Fe0.7Ce0.3O2−δ mixed oxide at 750 °C. It kept a stable production of hydrogen in the successive redox process at the condition of serious agglomeration of the materials. The highest hydrogen storage amount was up to 1.51 wt% for the Fe–Ce sample with a 30% substitution of Ce for Fe.
Journal: International Journal of Hydrogen Energy - Volume 39, Issue 25, 22 August 2014, Pages 13381–13388