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Application of Ru exchanged zeolite-Y in ammonia synthesis (1992)

Mahdi, W. ; Sauerlandt, U. ; Wellenbüscher, J. ; [et al.]

Springer

Catalysis letters 14 (1992), S. 339-348

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ISSN: 1572-879X

Keywords: Ammonia synthesis ; Ru-zeolite ; metal clusters ; conversion measurements

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Abstract Na-Y zeolite was cation exchanged with Ru(NH3)6Cl3 yielding at 25% exchange level a light-purple solid which was active in ammonia synthesis at atmospheric pressure. Pulse conversion experiments show that the catalyst stores nitrogen as it was observed with the conventional iron catalyst. At 810 K the conversion reached about 20% of the maximum conversion of the iron catalyst. The catalyst deactivated reversibly within 30 h due to agglomeration. The active species in the catalyst is most likely a cluster-like Ru metal particle prevented from sintering under the reducing conditions of catalysis by the zeolite framework.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00769672

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Surface characterization of ruthenium-exchanged Y-zeolite used in ammonia synthesisPaper presented at ECASIA 91, Hungary, 14-18 October 1991. (1992)

Wellenbüscher, J. ; Sauerland, U. ; Mahdi, W. ; [et al.]

Chichester [u.a.] : Wiley-Blackwell

Surface and Interface Analysis 18 (1992), S. 650-654

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ISSN: 0142-2421

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Physics

Notes: Na—Y zeolite was cation exchanged with Ru and tested in ammonia synthesis at atmospheric pressure. Activities up to ∼10% of the commercial iron catalyst scaled by the active surface area were observed. Characterization of the zeolites with XPS was complemented with reference thermal desorption spectroscopy data on a polycrystalline Ru metal surface. The catalysts showed high thermal stability in in situ reduction-oxidation cycles. The chemical state of the Ru will be discussed. From shift measurements the Ru is metallic in the active state, but line shape arguments point to a cluster-like particle morphology. The location of the Ru inside or outside the zeolite framework will be discussed.

Additional Material: 6 Ill.