Abstract
NiAl2O4 is readily formed during preparing conventional Ni/Al2O3 catalysts, and its low reducibility causes the re-formation of inactive NiAl2O4 due to the presence of oxidant during methane partial oxidation, which decreases catalyst activity and stability. CeO2 effectively promotes NiAl2O4 reduction via forming CeAlO3, which prevents the NiAl2O4 re-formation. A critical CeO2 ratio of 35.0 wt% CeO2/(CeO2+Al2O3) was found to favor CeAlO3 formation, which is corresponding to the stoichiometric composition of NiAl2O4. The pathway of CeAlO3 formation via NiAl2O4 reduction has been proposed and thermodynamically confirmed for the first time. The factors affecting CeAlO3 formation have been identified: the presence of Ni in the composite promotes CeAlO3 formation via solid reaction between CeO2 and NiAl2O4 during reduction; high reduction and reaction temperatures favor the CeAlO3 formation and stabilization. The thermally stable structure of fibrous catalysts enables the study of the temperature effects.
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