| Title: | Preparation of WO[sub]3 aerogel catalysts using supercritical CO[sub]2 |
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| Authors: | ID Novak, Zoran (Author)
ID Kotnik, Petra (Author)
ID Knez, Željko (Author) |
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| Files: |  http://dx.doi.org/10.1016/j.jnoncrysol.2004.06.046
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| Language: | English |
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| Work type: | Unknown |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | FKKT - Faculty of Chemistry and Chemical Engineering
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| 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. |
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| Keywords: | chemical processing, aerogels, catalysts, tungsten oxides, preparation of aerogels, characterisation of aerogels, supercritical CO2, supercritical drying, high pressure technology |
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| Year of publishing: | 2004 |
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| PID: | 20.500.12556/DKUM-27562  |
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| UDC: | 66-911.48:66-987 |
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| ISSN on article: | 0022-3093 |
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| COBISS.SI-ID: | 9330966 |
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| NUK URN: | URN:SI:UM:DK:0HQLMNMQ |
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| Publication date in DKUM: | 01.06.2012 |
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| Views: | 2310 |
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| Downloads: | 56 |
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| Metadata: |    |
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| Categories: | Misc.
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