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Unusual Oxidation Behaviour of Mesoporous Silicates towards Lignin Model Phenolic Monomer
Department of Chemistry, Utkal University, Bhubaneswar, India
Department of Chemistry, Utkal University, Bhubaneswar, India
Tata Chemicals Limited, Pune, India
Department of Chemistry, North Orissa University, Baripada, India
- 1 Department of Chemistry, Utkal University, Bhubaneswar, India
- 2 Department of Chemistry, Utkal University, Bhubaneswar, India
- 3 Tata Chemicals Limited, Pune, India
- 4 Department of Chemistry, North Orissa University, Baripada, India
World Journal of Nano Science and Engineering·Volume 05 (2015)·Pages 88–95·Published 20 July 2015·DOI10.4236/wjnse.2015.53011
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Abstract
Oxidation of the lignin model monomer apocynol , 1-(4-hydroxy-3-methoxyphenoxy)-ethanol catalysed by mesoporous silica catalysts i.e. MCM-41, MCM-48, SBA-15 using H 2 O 2 as an oxidant has been studied. Selectively, 2-methoxybenzoquinone was obtained along with acetovanillone. Such unprecedented oxidation behaviour of these metal free siliceous catalysts is attributed to the polar internal surface, high surface area as well as the pore architecture. On the other hand, the studied reaction was found to be non-selective when a commercial grade mesoporous silica i.e. Silica-5 was used as catalyst for comparison. Among the various silica catalysts studied, MCMs gave highest conversion and selectivity towards 2-methoxybenzoquinone under very mild reaction conditions.
KeywordsLigninApocynolMethoxybenzoquinoneAcetovanilloneMesoporous Silica
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