Premium
Surface characterization of ruthenium‐exchanged Y‐zeolite used in ammonia synthesis
Author(s) -
Wellenbüscher J.,
Sauerland U.,
Mahdi W.,
Ertl G.,
Schlögl R.
Publication year - 1992
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740180903
Subject(s) - zeolite , x ray photoelectron spectroscopy , catalysis , ruthenium , inorganic chemistry , thermal stability , crystallite , chemistry , ammonia , desorption , metal , characterization (materials science) , oxidation state , transition metal , thermal desorption spectroscopy , chemical state , chemical engineering , materials science , adsorption , nanotechnology , organic chemistry , crystallography , engineering
NaY 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.