ISSN:
1572-879X
Keywords:
Ammonia synthesis
;
supported ruthenium catalyst
;
dispersed ruthenium
;
instationary kinetics
;
lifetime effects
;
ruthenium oxidation
;
surface analysis
;
XPS
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Reaction of Ru(NH3)6Cl3 with Na-A and K-A zeolites yielded oligomeric amino-oxo-complexes supported on the zeolite. Controlled thermal activation under hydrogen converted the precursor in a two-step reaction into an active catalyst with good long-term stability and resistance against small doses of oxygen poison. Several nanometers sized Ru metal particles are chemically bonded to the zeolite surface which provides in the K form an alkali promoter at the metal-zeolite interface. Extensive oxidation breaks the metal-support anchoring and re-reduction produces Ru metal particles sintering rapidly into large metal crystals with only small residual catalytic activity.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00815416
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