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Ternary intermetallic LaCoSi as a catalyst for N2 activation
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Ternary intermetallic LaCoSi as a catalyst for N2 activation
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Journal Article
Ternary intermetallic LaCoSi as a catalyst for N2 activation
2018
Overview
Activating high-energy multiple bonds using earth-abundant metals is one of the most significant challenges in catalysis. Here, we show that LaCoSi—a ternary intermetallic compound—is an efficient and stable catalyst for N
2
activation to produce NH
3
. The ammonia synthesis is significantly promoted by shifting the reaction bottleneck from the sluggish N
2
dissociation to NH
x
formation, which few catalysts have achieved. Theoretical calculations reveal that the negatively charged cobalt mediates electron transfer from lanthanum to the adsorbed N
2
, which further reduces the activation barrier of N
2
dissociation. Most importantly, the specific LaCoSi geometric configuration stabilizes the N
2
adsorption with a strong exothermic effect, which dramatically decreases the apparent energy barrier of N
2
activation. Consequently, LaCoSi shows a superior activity (1,250
μ
mol g
−1
h
−1
), with a 60-fold increase over the activity of supported cobalt catalysts under mild reaction conditions (400
°
C, 0.1 MPa).
Ammonia synthesis is an energy-intensive process due to the high activation barrier for N
2
dissociation. Here, Hosono and co-workers show that the intermetallic compound LaCoSi can lower the energy requirement for N
2
activation and shift the rate-determining step of the process to NH
x
formation under mild conditions.
