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 [1 ]
Ichihashi, Masahiko [2 ]
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
来源：
CATALYSIS LETTERS | 2024年 / 154卷 / 02期
关键词：
Ammonia synthesis; Ruthenium cluster catalyst; Cerium oxide; Particle size; LOW-CRYSTALLINE; RU CATALYSTS; NANOPARTICLES; SENSITIVITY; EFFICIENT; SITES;
D O I：
10.1007/s10562-023-04332-z
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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] .
引用
收藏
页码：487 / 493
页数：7
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