Heterogeneous Catalysts From Rice Husk Modified With Chromium, Molybdenum And Tungsten: Synthesis, Characterization And Application In Styrene Oxidation
A series of chromium, molybdenum and tungsten incorporated silica extracted from rice husk were prepared at pH 10, pH 7 and pH 3 media using solvent extraction method and sol-gel technique. Liquid phase oxidation of styrene using hydrogen peroxide as oxidant was used as a probe to test their catalyt...
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| Format: | Thesis |
| Language: | English |
| Published: |
2011
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| Subjects: | |
| Online Access: | http://eprints.usm.my/43398/1/MOHAMMAD%20ANWAR%20MOHAMED%20IQBAL.pdf |
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| Summary: | A series of chromium, molybdenum and tungsten incorporated silica extracted from rice husk were prepared at pH 10, pH 7 and pH 3 media using solvent extraction method and sol-gel technique. Liquid phase oxidation of styrene using hydrogen peroxide as oxidant was used as a probe to test their catalytic potential. The incorporation of chromium into the silica matrix resulted in amorphous catalysts labeled RHCr-10, RHCr-7 and RHCr-3. RHCr-3 has the highest surface area (564 m2 g-1) but lowest chromium loading (2.3 w/w %). RHCr-3 showed better structural and catalytic properties compared to RHCr-7 and RHCr-10. About 99.9 % of styrene was successfully oxidized with 63.1 % selectivity towards benzaldehyde. |
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