Electronic and structural promotion of barium hexaaluminate as a ruthenium catalyst support for ammonia synthesis

Barium hexaaluminate (BHA) with large surface area (49 m 2 g −1) is synthesized by microemulsion-mediated synthesis technique and examined as a support promoting ammonia synthesis by particulate Ru. The Ru/BHA catalyst exhibits higher activity and stability than Ba-promoted Ru/MgO, the previously mo...

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Bibliographic Details
Published in:Journal of catalysis 2007-10, Vol.251 (2), p.321-331
Main Authors: You, Zhixiong, Inazu, Koji, Aika, Ken-ichi, Baba, Toshihide
Format: Article
Language:English
Subjects:
Ammonia
Ammonia synthesis
Barium hexaaluminate
Catalysis
Catalysts
Chemical synthesis
Chemistry
Comparative studies
Electronic promotion
Exact sciences and technology
General and physical chemistry
Ruthenium catalyst
Structural promotion
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:Barium hexaaluminate (BHA) with large surface area (49 m 2 g −1) is synthesized by microemulsion-mediated synthesis technique and examined as a support promoting ammonia synthesis by particulate Ru. The Ru/BHA catalyst exhibits higher activity and stability than Ba-promoted Ru/MgO, the previously most active oxide-supported catalyst system for ammonia synthesis. The rate of ammonia synthesis over Ru/BHA is 5426 μmol g −1 cat h −1 (653 K, 1.1 MPa), more than twice of that of Ba–Ru/MgO, and no decrease in the rate is observed over reaction for 80 h at 653 K and 0.1 MPa. Characterization of this catalyst system by various techniques reveals that the electronic and structural interactions between BHA and Ru particles are key factors responsible for the elevated activity and stability of this catalyst.
ISSN:0021-9517
1090-2694
DOI:10.1016/j.jcat.2007.08.006