Abstract
The activity of nickel and nickel bimetallic methanation catalysts was investigated under conditions representative of an industrial high temperature methanator. All catalysts were observed to suffer significant losses in activity above 723 K as a result of sintering and carbon deposition. At temperatures exceeding 723 K Ni/Al 2O 3 and Ni/NiAl 2O 4 catalysts are the most active while Ni/NiAl 2O 4 and Ni-MoO 3/Al 2O 3 catalysts are the most thermally stable, even in comparison with commercially available catalysts. The contributions of sintering and carbon deposition to catalyst degradation in the presence and absence of reactant steam are presented and discussed. In long term tests of Ni/Al 2O 3 at 773 K, accumulated carbon resulted in plugging of the reactor and catastrophic failure after only 17 hours. Analysis by transmission electron microscopy of samples run at high temperature showed the presence of carbon filaments terminated by nickel crystallites.
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