Název: Mechanochemical Preparation of Alumina-Ceria
Autoři: Jirátová, Květa ; Spojakina, A. ; Tyuliev, G. ; Balabánová, Jana ; Kaluža, Luděk ; Palcheva, R.
Typ dokumentu: Příspěvky z konference
Konference/Akce: ICCT International Conference on Chemical Technology, Mikulov (CZ), 2015-04-13 / 2015-04-15
Rok: 2015
Jazyk: eng
Abstrakt: Ceria containing catalysts play an essential role in heterogeneous catalytic processes. However, ceria shows poor thermal stability and low specific surface area and therefore, many studies have been done to improve its properties by combination with other oxides. Alumina-ceria is substantial component of the three ways catalysts, due to the ceria ability to function as the buffer of oxygen and to enhance the oxygen storage capacity of the catalysts. Ceria in these catalysts also functions as structural promoting component, increasing alumina stability towards thermal sintering. Promising method of oxides preparation, very interesting and simple but not sufficiently studied yet is a mechanochemical synthesis. Here we report on the synthesis of nano-sized alumina, ceria and ceria-alumina of various compositions by a wet solid phase mechanochemical reaction of hydrous aluminum, and/or cerium nitrate with ammonium bicarbonate after addition of a small amount of water. The aim of this contribution is to study processes being in progress during synthesis of the mixed oxides, interaction between components and their mutual effect on the properties of resulting products. The phase evolution during mechanical milling and the subsequent heat treatment of precursors were studied by X-ray diffraction, DTA/TG, H2-TPR, NH3-TPD, CO2-TPD, N2 adsorption at -195°C, IR, and XPS spectroscopy. Alumina and mixtures of alumina with different quantities of CeO2 (1- 18 wt. %) were synthesized by mechanochemical method from aluminum nitrate, cerium nitrate and ammonia bicarbonate.
Klíčová slova: alumina-ceria; mechanochemistry; sythesis of the mixed oxides
Číslo projektu: GA14-13750S (CEP)
Poskytovatel projektu: GA ČR
Zdrojový dokument: Proceedings of the 3rd International Conference on Chemical Technology, ISBN 978-80-86238-82-1
Poznámka: Související webová stránka: http://hdl.handle.net/11104/0248821
Práva: Dílo je chráněno podle autorského zákona č. 121/2000 Sb.

Instituce: Ústav chemických procesů AV ČR (web)
Původní záznam: http://hdl.handle.net/11104/0248821

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-261122


Záznam je zařazen do těchto sbírek:
Věda a výzkum > AV ČR > Ústav chemických procesů
Konferenční materiály > Příspěvky z konference