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Selective oxidation of benzyl alcohol over copper phthalocyanine immobilized on MCM-41

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Selective oxidation of benzyl alcohol over copper phthalocyanine immobilized on MCM-41. / Hamza, A.; Srinivas, D.
In: Catalysis Letters, Vol. 128, No. 2, 31.03.2009, p. 434-442.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Hamza, A & Srinivas, D 2009, 'Selective oxidation of benzyl alcohol over copper phthalocyanine immobilized on MCM-41', Catalysis Letters, vol. 128, no. 2, pp. 434-442. https://doi.org/10.1007/s10562-008-9770-4

APA

Hamza, A., & Srinivas, D. (2009). Selective oxidation of benzyl alcohol over copper phthalocyanine immobilized on MCM-41. Catalysis Letters, 128(2), 434-442. https://doi.org/10.1007/s10562-008-9770-4

Vancouver

Hamza A, Srinivas D. Selective oxidation of benzyl alcohol over copper phthalocyanine immobilized on MCM-41. Catalysis Letters. 2009 Mar 31;128(2):434-442. Epub 2008 Nov 22. doi: 10.1007/s10562-008-9770-4

Author

Hamza, A. ; Srinivas, D. / Selective oxidation of benzyl alcohol over copper phthalocyanine immobilized on MCM-41. In: Catalysis Letters. 2009 ; Vol. 128, No. 2. pp. 434-442.

Bibtex

@article{296079416b5a49d3abb7c5f54a761c79,
title = "Selective oxidation of benzyl alcohol over copper phthalocyanine immobilized on MCM-41",
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 (Br{\"o}nsted 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.",
author = "A. Hamza and D. Srinivas",
year = "2009",
month = mar,
day = "31",
doi = "10.1007/s10562-008-9770-4",
language = "English",
volume = "128",
pages = "434--442",
journal = "Catalysis Letters",
issn = "1011-372X",
publisher = "Springer",
number = "2",

}

RIS

TY - JOUR

T1 - Selective oxidation of benzyl alcohol over copper phthalocyanine immobilized on MCM-41

AU - Hamza, A.

AU - Srinivas, D.

PY - 2009/3/31

Y1 - 2009/3/31

N2 - 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.

AB - 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.

U2 - 10.1007/s10562-008-9770-4

DO - 10.1007/s10562-008-9770-4

M3 - Journal article

VL - 128

SP - 434

EP - 442

JO - Catalysis Letters

JF - Catalysis Letters

SN - 1011-372X

IS - 2

ER -