Optimization of Ruthenium Particle Size and Ceria Support for Enhanced Activity of Ru/CeO2 Cluster Catalysts in Ammonia Synthesis Under Mild Conditions
被引:2
作者:
Hirabayashi, Shinichi
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Genesis Res Inst Inc, East Tokyo Lab, 717-86 Futamata, Ichikawa, Chiba 2720001, JapanGenesis Res Inst Inc, East Tokyo Lab, 717-86 Futamata, Ichikawa, Chiba 2720001, Japan
Hirabayashi, Shinichi
[1
]
Ichihashi, Masahiko
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机构:
Genesis Res Inst Inc, Toyota Technol Inst, Cluster Res Lab, East Tokyo Lab, 717-86 Futamata, Ichikawa, Chiba 2720001, JapanGenesis Res Inst Inc, East Tokyo Lab, 717-86 Futamata, Ichikawa, Chiba 2720001, Japan
Ichihashi, Masahiko
[2
]
Takeda, Yoshihiro
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Genesis Res Inst Inc, East Tokyo Lab, 717-86 Futamata, Ichikawa, Chiba 2720001, JapanGenesis Res Inst Inc, East Tokyo Lab, 717-86 Futamata, Ichikawa, Chiba 2720001, Japan
Takeda, Yoshihiro
[1
]
机构:
[1] Genesis Res Inst Inc, East Tokyo Lab, 717-86 Futamata, Ichikawa, Chiba 2720001, Japan
[2] Genesis Res Inst Inc, Toyota Technol Inst, Cluster Res Lab, East Tokyo Lab, 717-86 Futamata, Ichikawa, Chiba 2720001, Japan
To meet the increasing demand for small-scale NH3 production, catalysts that work under milder conditions than those of the Haber-Bosch process are essential. In this study, Ru clusters and nanoparticles were impregnated on five different CeO2 supports to prepare Ru/CeO2 catalysts for NH3 synthesis at 400 degrees C and 0.1 MPa. The basicity of the CeO2 support and Ru particle size significantly influenced the catalytic activity. The catalytic activity increased with decreasing Ru particle size, reaching the maximum of similar to 200 mmol g(Ru) (-1) h(-1) at similar to 1 nm, which is ascribed to a high proportion of unique active sites different from the B-5-type sites. Our findings demonstrate that Ru cluster catalysts are advantageous over Ru nanoparticle catalysts for NH3 synthesis. [GRAPHICS] .