Methane Decomposition over Ni/α-Al_2O_3 Promoted by La_2O_3 and CeO_2

摘要

The decomposition of methane on Ni/α-Al_2O_3 modified by La_2O_3 and CeO_2 with different contents has been investigated and the ralationship between methane decomposition and removal of carbon by CO_2 over these catalyst has also been studied by pulse-chromatography. The catalysts were characterized by TPR and XRD. It was shown that Ni/α-Al_2O_3 could be promoted by adding La_2O_3, and the carbon species produced over this catalyst was activated and eliminated by CO_2. But CeO_2 would suppress the decomposition of methane over Ni crystallite. Both La_2O_3 and CeO_2 can inhibit aggregation of the Ni particles. Decomposition of methane over the Ni-based catalysts is structure sensitive to a certain extent.