authors |
Balula, SS; Cunha-Silva, L; Santos, ICMS; Estrada, AC; Fernandes, AC; Cavaleiro, JAS; Pires, J; Freire, C; Cavaleiro, AMV |
nationality |
International |
journal |
NEW JOURNAL OF CHEMISTRY |
keywords |
IRON-SUBSTITUTED POLYOXOTUNGSTATES; KEGGIN-TYPE POLYOXOTUNGSTATES; LIQUID-PHASE OXIDATION; HYDROGEN-PEROXIDE; MOLECULAR-OXYGEN; MESOPOROUS SILICA; STRUCTURAL-CHARACTERIZATION; SELECTIVE EPOXIDATION; PORPHYRIN COMPLEXES; AEROBIC EPOXIDATION |
abstract |
A series of tetrabutylammonium (TBA) salts of the transition metal mono-substituted silicotungstates [SiW11M(H2O)O-39](n-), M = Co-II, Fe-III, Mn-III, (SiW11M) were explored as homogeneous catalysts for the oxidation of geraniol and styrene with H2O2. The most active homogeneous catalysts (SiW11Co and SiW11Fe) were immobilized onto an amine-functionalized SBA-15 (aptesSBA-15) and the resulting composites were characterized using several techniques (FT-IR, FT-Raman, UV-Vis/DRS, elemental analysis, powder XRD, SEM and N-2 adsorption-desorption isotherms). The catalytic performance of the new composites SiW11Co@aptesSBA-15 and SiW11Fe@aptesSBA-15 was investigated under similar experimental conditions to those used for homogeneous counterparts. 2,3-Epoxygeraniol and benzaldehyde were the main products obtained from geraniol and styrene oxidation, respectively, for all the catalysts. SiW11Co and SiW11Co@aptesSBA-15 showed to be the most active catalysts for the oxidation of geraniol and styrene. The recyclability of the composite SiW11Co@aptesSBA-15 was investigated for three reaction cycles. The stability of the composites was confirmed using several techniques after catalytic cycles. |
publisher |
ROYAL SOC CHEMISTRY |
issn |
1144-0546 |
year published |
2013 |
volume |
37 |
issue |
8 |
beginning page |
2341 |
ending page |
2350 |
digital object identifier (doi) |
10.1039/c3nj00243h |
web of science category |
Chemistry, Multidisciplinary |
subject category |
Chemistry |
unique article identifier |
WOS:000321788100019
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ciceco authors
impact metrics
journal analysis (jcr 2019):
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journal impact factor |
3.288 |
5 year journal impact factor |
3.153 |
category normalized journal impact factor percentile |
61.864 |
dimensions (citation analysis):
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altmetrics (social interaction):
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