Ramli, Zainab and Nur, Hadi and Endud, Salasiah and Hamid, Helda and Hamdan, Halimaton (2006) Iron-porphyrin encapsulated in poly(methacrylic acid) and mesoporous Al-MCM-41 as catalysts in the oxidation of benzene to phenol. Materials Chemistry and Physics, 96 . pp. 337-342.
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Poly(methacrylic acid) (PMAA) and mesoporous molecular sieve Al-MCM-41 with Si/Al = 20 were used as supports for the encapsulation of bulky iron(III)-5,10,15,20-tetra-(4-pyridyl)porphyrin (Fe-TPyP). Metalloporphyrin of Fe(III) was encapsulated inside the mesopores of Al- MCM-41 by a process of sequential synthesis of Fe-TPyP by treatment of FeCl3 with 5,10,15,20-tetra-(4-pyridyl) porphyrin (TPyP), followed by encapsulation of Fe-TPyP. Fe-TPyP complexes were also successfully encapsulated in PMAA by polymerizing a monomer (MAA) with a cross-linker around the Fe-TPyP complexes. The materials obtained were identified using XRD, UVâ€“vis DR, FTIR and luminescence spectroscopies. The oxidation of benzene to phenol using aqueous hydrogen peroxide has been studied using both iron-porphyrin encapsulated in poly(methacrylic acid) and mesoporous Al-MCM-41 as catalysts. The encapsulated iron-porphyrin in PMAA (Fe-TPyPâ€“PMAA) give a higher catalytic activity compared to Fe-TPyP encapsulated in Al-MCM-41 (Fe-TPyPâ€“MCM-41). However, the product selectivity and the regenerability of Fe-TPyPâ€“PMAA are not as good as than those of Fe-TPyPâ€“MCM-41. One considers that the hydrophobic nature of Fe- TPyPâ€“PMAA may account for the high catalytic activity, and the ordered structure of Fe-TPyPâ€“MCM-41 may contribute to a high selectivity. Â© 2005 Elsevier B.V. All rights reserved.
|Subjects:||Q Science > QD Chemistry|
|Divisions:||Chemical and Natural Resources Engineering (Formerly known)|
|Deposited By:||Assoc. Prof. Dr. Zainab Ramli|
|Last Modified:||01 Jun 2010 03:03|
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