Structural Characteristics of (NiMgAl)Ox Prepared from a Layered Double Hydroxide Precursor and its Application in Direct Internal Reforming Molten Carbonate Fuel Cells
✍ Scribed by K. Park; K. Y. Kim; L. Lu; T.-H. Lim; S.-A. Hong; H.-I. Lee
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 647 KB
- Volume
- 7
- Category
- Article
- ISSN
- 1615-6846
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✦ Synopsis
Abstract
(NiMgAl)O~x~ materials prepared from layered double hydroxide (LDH) precursors show a typical mesoporous structure with an average pore size of about 6 nm, excellent activity for the methane steam reforming (MSR) reaction at 650 °C, and a strong resistance against Li poisoning, suggesting the possibility for future application in direct internal reforming molten carbonate fuel cells (DIR‐MCFC). X‐ray diffraction (XRD) experiments indicate that the molar ratio of Al/Mg exerts a strong effect on the properties of both the LDH precursors and final catalysts. Temperature‐programmed reduction (TPR) analysis reveals that the Al/Mg molar ratio influences the properties of Ni in the final catalyst. The catalytic performance of the catalysts prepared is greatly influenced by the molar ratio of Al/Mg for MSR. The activity gradually increases with an increase in the Al/Mg ratio (0.14–1.5). However, with further increases in the amount of Al added (Al/Mg = 2), the activity decreases. The activity is strongly related to the BET surface area and Ni dispersion. The Li‐poisoning test proves that Mg‐rich catalysts lose their activity quickly upon exposure to Li, while Al‐rich catalysts maintain virtually all of their original activity. NiMgAl (Al/Mg = 1.5) is found to be an excellent catalyst for the DIR‐MCFC, having both the highest activity and strongest resistance against Li poisoning.