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  Ruthenium as catalyst for ammonia synthesis

Muhler, M., Rosowski, F., Hinrichsen, O., Hornung, A., & Ertl, G. (1996). Ruthenium as catalyst for ammonia synthesis. In J. W. Hightower, W. N. Delgass, E. Iglesia, & A. T. Bell (Eds.), Proceedings of the 11th International Congress On Catalysis - 40th Anniversary (pp. 317-326). Elsevier.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0009-B4EF-F Version Permalink: https://hdl.handle.net/21.11116/0000-0009-FAA3-5
Genre: Conference Paper

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 Creators:
Muhler, Martin1, Author           
Rosowski, Frank1, Author           
Hinrichsen, Olaf1, Author           
Hornung, Alessandra1, Author           
Ertl, Gerhard1, Author           
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              

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 Abstract: Five Ru-based catalysts were prepared to study the effect of the support and the role of the alkali promoter in NH3 synthesis: Ru/Al2O3, Ru/MgO, Cs-Ru/Al2O3 and Cs(K)−Ru/MgO. The catalysts were characterized by N2 physisorption, H2 chemisorption and XPS. The absence of chlorine- and sulphur containing compounds turned out to be important for the preparation of highly active catalysts. Power law expressions were derived from conversion measurements at atmospheric, pressure and at 20 bar. For all catalysts, the reaction order for H2 was found to be negative suggesting that a PN2/PH2 ratio in the feed gas higher than 1/3 would be favourable for industrial NH3 synthesis at high pressure. The microkinetic analysis of the temperature-programmed desorption and adsorption of N2 and of the kinetics of isotopic exchange demonstrated the enhancing influence of the Cs promoter on the rate of N2 dissociation and recombination. XPS measurements after through reduction revealed a shift of the Ru 3d5/2 peak to lower binding energy by about 1 e V in the presence of Cs suggesting an electronic promoter effect.

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Language(s): eng - English
 Dates: 1996
 Publication Status: Issued
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/S0167-2991(96)80242-4
 Degree: -

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Title: 11th International Congress On Catalysis - 40th Anniversary
Place of Event: Baltimore, MD, USA
Start-/End Date: 1996-06-30 - 1996-07-05

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Title: Proceedings of the 11th International Congress On Catalysis - 40th Anniversary
Source Genre: Proceedings
 Creator(s):
Hightower, Joe W., Editor
Delgass, W. Nicholas, Editor
Iglesia, Enrique, Editor
Bell, Alexis T., Editor
Affiliations:
-
Publ. Info: Elsevier
Pages: 10 Volume / Issue: 101 Sequence Number: - Start / End Page: 317 - 326 Identifier: -

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Title: Studies in Surface Science and Catalysis
Source Genre: Series
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Publ. Info: -
Pages: - Volume / Issue: 101 Sequence Number: - Start / End Page: - Identifier: -