Sol-gel preparation of alumina stabilized rare earth areo- and xerogels and their use as oxidation catalysts

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F14%3A10288969" target="_blank" >RIV/00216208:11320/14:10288969 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.jcis.2014.02.004" target="_blank" >http://dx.doi.org/10.1016/j.jcis.2014.02.004</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jcis.2014.02.004" target="_blank" >10.1016/j.jcis.2014.02.004</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Sol-gel preparation of alumina stabilized rare earth areo- and xerogels and their use as oxidation catalysts

Popis výsledku v původním jazyce

A new sal-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 degrees 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, d

Název v anglickém jazyce

Sol-gel preparation of alumina stabilized rare earth areo- and xerogels and their use as oxidation catalysts

Popis výsledku anglicky

A new sal-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 degrees 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, d

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

<a href="/cs/project/LD11047" target="_blank" >LD11047: Modelové systémy nanostrukturních bimetalických katalyzátorů pro ochranu životního prostředí</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Colloid and Interface Science

ISSN

0021-9797

e-ISSN

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Svazek periodika

422

Číslo periodika v rámci svazku

květen

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

71-78

Kód UT WoS článku

000334652400011

EID výsledku v databázi Scopus

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