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

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About: Sol-gel preparation of alumina stabilized rare earth areo- and xerogels and their use as oxidation catalysts Goto Sponge NotDistinct Permalink

An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

Attributes	Values
rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://dx.doi.org/10.1016/j.jcis.2014.02.004
Description	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, decreased with increasing calcination temperature. (c) 2014 Elsevier Inc. All rights reserved. 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, decreased with increasing calcination temperature. (c) 2014 Elsevier Inc. All rights reserved. (en)
Title	Sol-gel preparation of alumina stabilized rare earth areo- and xerogels and their use as oxidation catalysts Sol-gel preparation of alumina stabilized rare earth areo- and xerogels and their use as oxidation catalysts (en)
skos:prefLabel	Sol-gel preparation of alumina stabilized rare earth areo- and xerogels and their use as oxidation catalysts Sol-gel preparation of alumina stabilized rare earth areo- and xerogels and their use as oxidation catalysts (en)
skos:notation	RIV/00216208:11320/14:10288969!RIV15-MSM-11320___
http://linked.open...avai/riv/aktivita	I P S
http://linked.open...avai/riv/aktivity	I, P(LD11047), S
http://linked.open...iv/cisloPeriodika	květen
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Matolín, Vladimír Rednyk, Andrii
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Karlova v Praze / Matematicko-fyzikální fakulta
http://linked.open...dnocenehoVysledku	45876
http://linked.open...ai/riv/idVysledku	RIV/00216208:11320/14:10288969
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	CO oxidation; Rare earth oxides; Xerogels; Aerogels; Sol-gel chemistry (en)
http://linked.open.../riv/klicoveSlovo	CO oxidation Aerogels Rare earth oxides Sol-gel chemistry Xerogels
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[7906B40FC0DA]
http://linked.open...i/riv/nazevZdroje	Journal of Colloid and Interface Science
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	6 (xsd:int)
http://linked.open...vavai/riv/projekt	Model Systems of Nanostructured Bimetallic Materials for Enviromental Applications
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	422
http://linked.open...iv/tvurceVysledku	Matolín, Vladimír Baeumer, Marcus Gash, Alexander E. Gesing, Thorsten M. Neumann, Bjoern Rednyk, Andrii
http://linked.open...ain/vavai/riv/wos	000334652400011
issn	0021-9797
number of pages	8 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.jcis.2014.02.004
http://localhost/t...ganizacniJednotka	11320

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