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The effect of Al-doping on ZnO nanoparticles applied as catalyst support

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons21347

Behrens,  Malte
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Ertl Center for Electrochemistry & Catalysis, Gwangju Institute of Science and Technology (GIST);

Lolli,  Giullio
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

Muratova,  Nelli
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons21700

Kasatkin,  Igor
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons21908

Naumann d'Alnoncourt,  Raoul
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons22071

Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Volltexte (frei zugänglich)

c2cp41680h.pdf
(Verlagsversion), 2MB

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Zitation

Behrens, M., Lolli, G., Muratova, N., Kasatkin, I., Hävecker, M., Naumann d'Alnoncourt, R., et al. (2013). The effect of Al-doping on ZnO nanoparticles applied as catalyst support. Physical Chemistry Chemical Physics, 15(5), 1374-1381. doi:10.1039/C2CP41680H.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-000F-D27A-9
Zusammenfassung
A pure ZnO sample and a sample containing 3 mol% Al were prepared by (co)-precipitation as model materials for the oxidic support phase in Cu/ZnO/Al2O3 methanol synthesis catalysts. The samples were characterized with respect to their crystal, defect and micro-structure using various methods (XRD, TEM, XPS, UV-vis spectroscopy, EPR, NMR). It was found that a significant fraction of the Al is incorporated into the ZnO lattice and enhances the defect chemistry of the material. The defect structure, however, was not stable under reducing conditions as applied in catalytic reactions. Al ions migrated towards the surface of the ZnO nanoparticles leading to formation of an Al-rich shell and an Al-depleted core. This process proceeds during the first 10–20 hours on stream and is associated with strong modification of the optical bandgap energy and the EPR signal of donor sites present in ZnO.