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High‐Pressure Soft X‐Ray Absorption Spectroscopy: A Contribution to Overcoming the “Pressure Gap” in the Study of Heterogeneous Catalytic Processes
Author(s) -
Hävecker Michael,
KnopGericke Axel,
SchedelNiedrig Thomas,
Schlögl Robert
Publication year - 1998
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/(sici)1521-3773(19980803)37:13/14<1939::aid-anie1939>3.0.co;2-t
Subject(s) - suboxide , copper , catalysis , absorption (acoustics) , phase (matter) , methanol , materials science , oxygen , absorption spectroscopy , spectroscopy , analytical chemistry (journal) , x ray absorption spectroscopy , chemistry , optics , metallurgy , composite material , physics , chromatography , organic chemistry , quantum mechanics
For the first time an active surface phase was characterized by means of surface‐sensitive X‐ray absorption in the soft X‐ray region—the oxidation of methanol on copper under practicle conditions was used as an example—and its function was correlated with the catalytic activity of the system. This phase is not merely oxygen absorbed onto the surface (left picture, O=black spheres), but rather a copper suboxide which is formed in the region near the surface (right picture).