Supported Catalysts with Ru-M (M = Fe, Co, Ni, Mo) Bimetallic Active Centers for Ammonia Synthesis

Supported Ru-M (M = Fe, Co, Ni, Mo) bimetallic active center catalysts with a potassium promoter for the ammonia synthesis were studied. The activity of the Ru-Co catalyst is the highest, and the activity of the Ru-Mo catalyst is the lowest. When the Ru loading decreases by half (from 4% to 2%), the Ru-Co catalyst with a Co loading of 2% is the most valuable and exhibits an activity almost the same as the catalyst with 4% Ru and 4% Co. The Ru-Co catalysts with Ru and Co loadings of 2% each supported on Mg-Al complex oxide, MgAl2O4 spinel, and MgO were also studied. The catalyst supported on MgO calcined at 600°C has the highest activity.