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| Content Provider | Springer Nature Link |
|---|---|
| Author | Hamza, A. Srinivas, D. |
| Copyright Year | 2008 |
| Abstract | Copper phthalocyanine (CuPc) complexes immobilized on “neat” and Ti4+ and Al3+ containing MCM-41 mimic the functionality of metalloenzymes. These novel materials catalyze the oxidation of benzyl alcohol to selectively benzaldehyde at moderate temperatures using peroxides and molecular oxygen as oxidant. Electron paramagnetic resonance and X-ray photoelectron spectroscopic studies revealed that the acidity of the support (MCM-41) influences the electronic structure of the immobilized CuPc. On acidic supports a part of copper in CuPc got reduced from a “formal” +2 to +1 oxidation state. This reduction of copper in its oxidation state on different supports decreased in the order: Al-MCM-41 (Brönsted and strong Lewis acid sites) > MCM-41 (silanol sites) > Ti-MCM-41 (weak Lewis acid sites). A linear variation in catalytic activity with the concentration of Cu1+ ions in different catalyst samples was observed. The study reveals that by suitably modifying the acidic properties of the support one can, in principle, fine-tune the electronic and catalytic properties of the active oxidation sites. |
| Starting Page | 434 |
| Ending Page | 442 |
| Page Count | 9 |
| File Format | |
| ISSN | 1011372X |
| Journal | Catalysis Letters |
| Volume Number | 128 |
| Issue Number | 3-4 |
| e-ISSN | 1572879X |
| Language | English |
| Publisher | Springer US |
| Publisher Date | 2008-11-22 |
| Publisher Place | Boston |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Selective oxidation of benzyl alcohol Copper phthalocyanine MCM-41 EPR UV–visible spectroscopy Pharmacy Industrial Chemistry/Chemical Engineering Physical Chemistry Catalysis |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Catalysis |
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