Characterisation of Ru/C catalysts for ammonia synthesis by oxygen chemisorption

被引：51
|
作者：
Rossetti, I
Pernicone, N
Forni, L
机构：
[1] Univ Milan, Dipartimento Chim Fis & Elettrochim, I-20133 Milan, Italy
[2] Univ Milan, Dipartimento Chim Fis & Elettrochim, Novara, Italy
来源：
APPLIED CATALYSIS A-GENERAL | 2003年 / 248卷 / 1-2期
关键词：
O-2; chemisorption; Ru/C catalyst; ammonia synthesis; Ru metal dispersion;
D O I：
10.1016/S0926-860X(03)00151-0
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：
A standard chemisorption procedure has been set up for the determination of Ru dispersion in Ru/C catalysts. Pulse chemisorption of oxygen was carried out at 0 degreesC, after having proved that no corrosive chemisorption phenomena are present. An average chemisorption stoichiometry Ru*/O = 1.0 was experimentally determined through measurements on Ru black. The procedure was applied to the investigation of promoted and unpromoted Ru/C catalysts for ammonia synthesis, supported on two different carbon supports. The main factor influencing Ru dispersion showed to be Ru loading, while the addition of even large amounts of Ba-Cs-K promoters has practically no influence. It is also briefly discussed how such results can help in elucidating several aspects of the behaviour of Ru/C as catalyst for ammonia synthesis. (C) 2003 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：97 / 103
页数：7
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