Insights into Ru Crystal Phase Regulated by Reducing Agent for the Catalytic Activity of Ammonia Synthesis
Ru nanoparticles with fcc and hcp crystal phases were obtained by chemical reduction method using different precursors and reducing agents,and their catalytic properties in ammonia synthesis were compared.The catalytic reaction rate(666.4 μmol·h-1·g-1)of fcc Ru catalyst is higher than that of hcp Ru(378.9 μmol·h-1·g-1)at the reaction temperature(400℃)and pressure(1 MPa).The results indicate that the exposed crystal faces have a certain impact on the catalytic activity.The dissociation ability to N2 of fcc Ru exposed(111)and(200)is better than that of hcp Ru exposed(100).When the ruthenium catalyst was loaded on rod-like CeO2 support,the ammonia synthesis activity was further improved.The ammonia synthesis activity of fcc Ru/CeO2 is 1.4 times higher than that of hcp Ru/CeO2 under the test conditions.
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