The relationship between the activity and the precursor phase composition of the molten iron catalyst for ammonia synthesis has been studied with high pressure testing equipment and XRD. A humped curve between the act...The relationship between the activity and the precursor phase composition of the molten iron catalyst for ammonia synthesis has been studied with high pressure testing equipment and XRD. A humped curve between the activity and Fe2+/Fe3+ has been obtained. It is found that the unicity of the iron oxidate phase in precursor is an essential condition of the high activity of the iron catalyst and that the uniform distribution of the adominant phase and the promoters is the key to preparing a catalyst with better performance The humped curve is interpreted using the ratio f of the phase compositions in precursor. A new idea has been obtained that the activity change of the molten iron catalyst depends essentially on the molecule ratio of the different iron oxidates in precursor under the certain promoters, and it is found that the FeO based catalyst for ammonia synthesis with Wustite phase structure (Fe1-xO, 0.04≤x≤0.10) has the highest activity of all the molten iron catalysts for ammonia synthesis.展开更多
基金Project supported by the Provincial Natural Science Foundation of Zhejiang.
文摘The relationship between the activity and the precursor phase composition of the molten iron catalyst for ammonia synthesis has been studied with high pressure testing equipment and XRD. A humped curve between the activity and Fe2+/Fe3+ has been obtained. It is found that the unicity of the iron oxidate phase in precursor is an essential condition of the high activity of the iron catalyst and that the uniform distribution of the adominant phase and the promoters is the key to preparing a catalyst with better performance The humped curve is interpreted using the ratio f of the phase compositions in precursor. A new idea has been obtained that the activity change of the molten iron catalyst depends essentially on the molecule ratio of the different iron oxidates in precursor under the certain promoters, and it is found that the FeO based catalyst for ammonia synthesis with Wustite phase structure (Fe1-xO, 0.04≤x≤0.10) has the highest activity of all the molten iron catalysts for ammonia synthesis.
