TiO2-CeO2 prepared by using pressurized and supercritical fluids: effect of processing parameters and cerium amount on (micro)structural and morphological properties

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F15%3A10314545" target="_blank" >RIV/00216208:11320/15:10314545 - isvavai.cz</a>

Alternative codes found

RIV/61989100:27710/15:86095370

Result on the web

<a href="http://dx.doi.org/10.1007/s11164-015-1990-9" target="_blank" >http://dx.doi.org/10.1007/s11164-015-1990-9</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11164-015-1990-9" target="_blank" >10.1007/s11164-015-1990-9</a>

Result language

angličtina

Original language name

TiO2-CeO2 prepared by using pressurized and supercritical fluids: effect of processing parameters and cerium amount on (micro)structural and morphological properties

Original language description

Ce (x) Ti1-x O (n) composites with different Ti:Ce molar ratios (from 95:05 up to 70:30) were prepared unconventionally, via the sol-gel process controlled within reverse micelles of nonionic surfactant and processing by pressurized hot and supercritical fluids in a flow regime as an alternative to common thermal treatment. Nitrogen physisorption, powder X-ray diffraction (XRD) combined with Rietveld/whole powder pattern modeling (WPPM) and organic elemental analysis (OEA) were used as tools for characterization of the porous structure morphology, structural and microstructural properties, and purity of the prepared composites. All prepared Ce (x) Ti1-x O (n) composites possessed well-developed mesoporous structure with minimum portion of micropores, showing specific surface area in the range of 203-256 m(2)/g. The experimental conditions during pressurized hot and supercritical processing as well as the Ce loading played a key role in crystallization of individual Ce (x) Ti1-x O (n) composites. With increasing Ce loading, crystallization of anatase at the expense of brookite was promoted, accompanied with decreasing microstrain in anatase crystallites. The elevated processing temperature (250 A degrees C) led to crystallization of CeO2 cubic beside TiO2 anatase. As a consequence of the different solubility of the used surfactant in pressurized hot and supercritical solvents under pressures of 10 and 30 MPa, cubic CeO2 crystallites of different sizes were formed. This property of CeO2 crystallites crucially affected the recrystallization of Ce0.30Ti0.70O (n) -S composites at elevated temperatures; small and uniform CeO2 crystallites stabilized the anatase-cerianite phase mixture, giving rise to minor brookite phase.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

CA - Inorganic chemistry

OECD FORD branch

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Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2015

Confidentiality

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

Name of the periodical

Research on Chemical Intermediates

ISSN

0922-6168

e-ISSN

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Volume of the periodical

41

Issue of the periodical within the volume

12

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

15

Pages from-to

9243-9257

UT code for WoS article

000365743300008

EID of the result in the Scopus database

2-s2.0-84953365008