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Microwave assisted oxidation of a lignin model phenolic monomer using Co(salen)/SBA-15

Paper ID Volume ID Publish Year Pages File Format Full-Text
51478 46843 2009 4 PDF Available
Title
Microwave assisted oxidation of a lignin model phenolic monomer using Co(salen)/SBA-15
Abstract

The microwave assisted oxidative degradation of a lignin model phenolic monomer (1-(4-hydroxy-3-methoxyphenoxy)-ethanol, apocynol) catalysed by Co(salen)/SBA-15 is reported. The catalyst was prepared by immobilizing [N,N′-bis(salicylidene)ethane-1,2-diaminato]Cobalt(II), Co(salen) complex on to the periodic mesopore channels of siliceous SBA-15. Powder X-ray diffraction data revealed that the host retains its hexagonal mesoporous structure after immobilization. Upon immobilization, the surface area and pore size of SBA-15 was considerably decreased indicating the intrapore confinement of the complex. A blue shift (about 30 nm) observed in the DRUV–vis spectra of the immobilized complex as compared to the free complex revealed that the Co(salen) is anchored onto the inner surface, presumably through silanol groups. Cobalt content in the final catalyst was found to be 16 μmol g−1. The activity of the Co(salen)/SBA-15 was investigated in the oxidation of apocynol in the presence of hydrogen peroxide as oxidant. Complete degradation of apocynol was obtained after 40 min of reaction under microwave irradiation, compared to a poor 57% degradation after 24 h under conventional heating.

Keywords
Apocynol; Co(salen)/SBA-15; Heterogeneous catalysis; Microwave irradiation
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Microwave assisted oxidation of a lignin model phenolic monomer using Co(salen)/SBA-15
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 10, Issue 6, 15 February 2009, Pages 1010–1013
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
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