| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 41482 | Applied Catalysis A: General | 2011 | 6 Pages |
Selective catalytic oxidation of geraniol to citral with molecular oxygen in supercritical carbon dioxide (scCO2) has been investigated. The catalyst used was a chromium containing mesoporous molecular sieve catalyst viz. CrMCM-41. Comparison studies were performed with CoMCM-41, PtMCM-41 and PdMCM-41 catalysts. Among the various catalysts studied, CrMCM-41 showed a high conversion of geraniol and an excellent selectivity for citral. In contrast CoMCM-41, PtMCM-41 and PdMCM-41 catalysts exhibited low conversion of geraniol. However all three catalysts compared showed similar citral selectivity to CrMCM-41. The effect of CO2 pressure and reaction temperature geraniol oxidation was studied with CrMCM-41. Supercritical CO2 medium was found to enhance the conversion of geraniol and/or yield of citral. It was noticed that the catalyst can be recycled with negligible loss of conversion.
Graphical abstractCrMCM-41 catalyst gave a good conversion of geraniol (X = 53%) and high selectivity of citral (S = 98%) in scCO2 media at 80 °C for 6 h.Figure optionsDownload full-size imageDownload high-quality image (111 K)Download as PowerPoint slideResearch highlights▶ CrMCM-41 gave high selectivity (98%) and good yield (52%) of citral in scCO2. ▶ Conversion of geraniol is enhanced in scCO2. ▶ Activity of CrMCM-41 is higher than PtMCM-41 and PdMCM-41.
