New insights into the support morphology-dependent ammonia synthesis activity of Ru/CeO2 catalysts

被引：163
作者：
Ma, Zhanwei [1 ,2 ]
Zhao, Shengli [1 ,2 ]
Pei, Xiaoping [1 ,2 ]
Xiong, Xumao [1 ]
Hu, Bin [1 ]
机构：
[1] Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Oxo Synth & Select Oxidat, Lanzhou 730000, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
来源：
CATALYSIS SCIENCE & TECHNOLOGY | 2017年 / 7卷 / 01期
基金：
中国国家自然科学基金;
关键词：
RU NANOPARTICLES; RUTHENIUM CATALYSTS; CRYSTAL-PLANE; X-RAY; NANOSCALE CERIA; LATTICE STRAIN; CO OXIDATION; CS-RU/C; BARIUM; ACTIVATION;
D O I：
10.1039/c6cy02089e
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：
Three ceria nanocrystals with different morphologies (nanocubes, nanorods, and nanoparticles) were synthesized and used as supports to evaluate the support morphology-dependent ammonia synthesis activity in the structure-sensitive ammonia synthesis reaction. The Ru/r-CeO2 catalyst shows a higher catalytic reaction rate (3830 mu mol g(-1) h) than that of Ru/c-CeO2 (1289 mu mol g(-1) h) and Ru/p-CeO2 (529 mu mol g(-1) h) under the reaction conditions of 400 degrees C, 1 MPa, and 60 mL min(-1). In addition, promoters (Cs, K, and Ba) can effectively enhance the catalytic activity of the catalysts such as 2Cs-Ru/r-CeO2 (14 266 mu mol g(-1) h) and 2K-Ru/r-CeO2 (11227 mu mol g(-1) h). The effect of the morphology of the CeO2 support on the metal-support interaction and catalytic performance of the Ru/CeO2 catalysts can be correlated to the exposed crystal planes and surface composition/electronic structure of the CeO2 support with diverse morphologies.
引用
收藏
页码：191 / 199
页数：9
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