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Naslov:Preparation of WO[sub]3 aerogel catalysts using supercritical CO[sub]2
Avtorji:ID Novak, Zoran (Avtor)
ID Kotnik, Petra (Avtor)
ID Knez, Željko (Avtor)
Datoteke:URL http://dx.doi.org/10.1016/j.jnoncrysol.2004.06.046
 
Jezik:Angleški jezik
Vrsta gradiva:Neznano
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FKKT - Fakulteta za kemijo in kemijsko tehnologijo
Opis:Single tungsten oxide aerogels (WO3), binary oxide aerogels (WO3-Al2O3) and ternary oxide aerogels (WO3-SiO2-Al2O3) were prepared using standard sol-gel route. Tungsten oxide tetraethoxide (WO(OCH2CH3)4) was used as the sol-gel precursor. The excellent properties of the gels obtained by the sol-gel synthesis were preserved upon supercritical drying with CO2. After supercritical drying at 40 °C and 100 bar, all aerogels were calcined to 800 °C. The influence of the synthesis parameters on the catalytic activity of WO3as supported on silica andžor alumina aerogels was investigated through thetransformation of N-(phosphonomethyl)iminodiacetic acid to N-(phosphonomethyl)glycine. Despite including WO3 into single and mixed silicaand alumina aerogels, high specific surface areas (284-653 m2 g-1) were preserved. Higher conversion was obtained for catalysts with higher ratios of WO3 in the mixed silica-alumina aerogels that were calcined at 800 °C.
Ključne besede:chemical processing, aerogels, catalysts, tungsten oxides, preparation of aerogels, characterisation of aerogels, supercritical CO2, supercritical drying, high pressure technology
Leto izida:2004
PID:20.500.12556/DKUM-27562 Novo okno
UDK:66-911.48:66-987
COBISS.SI-ID:9330966 Novo okno
ISSN pri članku:0022-3093
NUK URN:URN:SI:UM:DK:0HQLMNMQ
Datum objave v DKUM:01.06.2012
Število ogledov:2113
Število prenosov:49
Metapodatki:XML DC-XML DC-RDF
Področja:Ostalo
:
NOVAK, Zoran, KOTNIK, Petra in KNEZ, Željko, 2004, Preparation of WO[sub]3 aerogel catalysts using supercritical CO[sub]2. Journal of non-crystalline solids [na spletu]. 2004. [Dostopano 29 marec 2025]. Pridobljeno s: http://dx.doi.org/10.1016/j.jnoncrysol.2004.06.046
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Gradivo je del revije

Naslov:Journal of non-crystalline solids
Skrajšan naslov:J. non-cryst. solids
Založnik:North-Holland Publishing Co
ISSN:0022-3093
COBISS.SI-ID:25770752 Novo okno

Sekundarni jezik

Jezik:Angleški jezik
Ključne besede:kemijska procesna tehnika, aerogeli, katalizatorji, volframovi oksidi, priprava aerogelov, karakterizacija aerogelov, superkritični CO2, superkritično sušenje, visokotlačna tehnologija


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