Sol―gel preparation of alumina stabilized rare earth areo- and xerogels and their use as oxidation catalysts
In: Journal of colloid and interface science, 2014, Heft 422, S. 71-78
academicJournal
- print, 17 ref
Zugriff:
A new sol―gel synthesis route for rare earth (Ce and Pr) alumina hybrid aero- and xerogels is presented which is based on the so-called epoxide addition method. The resulting materials are characterized by TEM, XRD and nitrogen adsorption. The results reveal a different crystallization behavior for the praseodymia/alumina and the ceria/alumina gel. Whereas the first remains amorphous until 875° C, small ceria domains form already after preparation in the second case which grow with increasing calcination temperature. The use of the calcined gels as CO oxidation catalysts was studied in a quartz tube (lab) reactor and in a (slit) microreactor and compared to reference catalysts consisting of the pure rare earth oxides. The Ce/Al hybrid gels exhibit a good catalytic activity and a thermal stability against sintering which was superior to the investigated reference catalyst. In contrast, the Pr/Al hybrid gels show lower CO oxidation activity which, due to the formation of PrAlO3, decreased with increasing calcination temperature.
Titel: |
Sol―gel preparation of alumina stabilized rare earth areo- and xerogels and their use as oxidation catalysts
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Autor/in / Beteiligte Person: | NEUMANN, Björn ; GESING, Thorsten M ; REDNYK, Andrii ; MATOLIN, Vladimir ; GASH, Alexander E ; BÄUMER, Marcus |
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Zeitschrift: | Journal of colloid and interface science, 2014, Heft 422, S. 71-78 |
Veröffentlichung: | Amsterdam: Elsevier, 2014 |
Medientyp: | academicJournal |
Umfang: | print, 17 ref |
ISSN: | 0021-9797 (print) |
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