Production of Hydrogen and Nanocarbon From Catalytic Decomposition of Methane Over a Ni-Fe/Al2O3 Catalyst
- Type: Conference Presentation
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In this work, the influence of the doping of iron to co-precipitated Ni-Al catalysts on the stability and activity of the reaction was investigated. The mixed oxide was prepared from the precursor which possesses a well-crystallized hydrotalcite-like anionic clay structure. In the mixed metal oxides obtained from calcination of the co-precipitated precursors, NiO phase dominates and the iron oxide is uniformly dispersed in NiO phase. The constant temperature reaction result indicates that the addition of iron enhances the stability of the Ni/Al2O3 catalyst greatly. Since the diffusion coefficient of carbon atoms through iron metal is three orders of magnitude higher than that through nickel metal. Modification of the catalyst with doping iron increases the carbon diffusion rate thus enhances the stability of the catalyst at high temperatures. The carbon yield of the prepared Ni-Fe/Al2O3 catalyst (mole ratio of Ni-Fe-Al=2:1:1) at 923 K was 851.3 g C/ g cat which is the highest yield in the literature reported and the reaction lasted more than 200 h. This work provides a new catalyst which is extremely stable for MCD reaction and is promising for the H2 production for PEMFC.