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Title:Preparation of WO[sub]3 aerogel catalysts using supercritical CO[sub]2
Authors:ID Novak, Zoran (Author)
ID Kotnik, Petra (Author)
ID Knez, Željko (Author)
Files:URL http://dx.doi.org/10.1016/j.jnoncrysol.2004.06.046
 
Language:English
Work type:Unknown
Typology:1.01 - Original Scientific Article
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract: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.
Keywords:chemical processing, aerogels, catalysts, tungsten oxides, preparation of aerogels, characterisation of aerogels, supercritical CO2, supercritical drying, high pressure technology
Year of publishing:2004
PID:20.500.12556/DKUM-27562 New window
UDC:66-911.48:66-987
ISSN on article:0022-3093
COBISS.SI-ID:9330966 New window
NUK URN:URN:SI:UM:DK:0HQLMNMQ
Publication date in DKUM:01.06.2012
Views:2113
Downloads:49
Metadata:XML DC-XML DC-RDF
Categories:Misc.
:
NOVAK, Zoran, KOTNIK, Petra and KNEZ, Željko, 2004, Preparation of WO[sub]3 aerogel catalysts using supercritical CO[sub]2. Journal of non-crystalline solids [online]. 2004. [Accessed 21 March 2025]. Retrieved from: http://dx.doi.org/10.1016/j.jnoncrysol.2004.06.046
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Record is a part of a journal

Title:Journal of non-crystalline solids
Shortened title:J. non-cryst. solids
Publisher:North-Holland Publishing Co
ISSN:0022-3093
COBISS.SI-ID:25770752 New window

Secondary language

Language:English
Keywords:kemijska procesna tehnika, aerogeli, katalizatorji, volframovi oksidi, priprava aerogelov, karakterizacija aerogelov, superkritični CO2, superkritično sušenje, visokotlačna tehnologija


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