In the laboratory and the side draw test unit of a commercial ammonia synthesis reactor

the performance of the FA-Ru catalyst and the A202 iron catalyst was compared

and the influence of the iron catalyst coupled with ruthenium catalyst and the single iron catalyst on ammonia synthesis was investigated.Experiment results showed that the activity of the FA-Ru catalyst for ammonia synthesis was higher than the A202 catalyst by 44%—75% at low temperature（375—425℃）

low pressure（10—15 MPa）

low H2/N2 ratio and high concentration of ammonia synthesis gas（10%—16%

vol）in the laboratory.Ammonia conversion was higher than that of the single iron catalyst by 24.5%—44.8% and increased with increasing ruthenium catalyst loading in mixed catalyst bed under laboratory condition.Similarly

ammonia conversion was higher than that of the single iron catalyst by 27.7%—58.8% and increased with increasing ruthenium catalyst loading in tandem with iron catalyst under laboratory condition.The reaction temperature of ruthenium catalyst bed might be lowered to 400℃ when ruthenium catalyst loading reached above half of the iron catalyst.Side draw experiments showed that ammonia conversion of FA-Ru catalyst at 13.0 MPa and 10000—15000 h-1 might achieve the level of the single iron catalyst at 26 MPa for the same space velocity.Ammonia conversion of iron and ruthenium catalysts in tandem was 43%—56% higher than that of the single iron catalyst

depending on the operation condition.