Metal organic framework oxidation of hardwood lignin in the presence of oxygen
by Korbieh, Theresah Nom, M.S., STATE UNIVERSITY OF NEW YORK COL. OF ENVIRONMENTAL SCIENCE & FORESTRY, 2010, 110 pages; 1482113

Abstract:

The quest for green chemicals has resulted in an upsurge of research work into porous materials for separation and catalytic purposes of which Metal Organic Framework (MOF) belongs. Earlier research work by our group proved that MOF (Cu2+/Fe3+) could be used successfully to replace nitrobenzene in the oxidation of in-situ hardwood lignin to produce vanillin and syringylaldehyde.

Benzenetricarboxylic acid complex of Cu (II) and Fe (III); - an MOF, used as an oxidant, was found to convert the phenylpropane (C9) units in in-situ poplar lignin to approximately 50% monomers. A comparison of syringyl (S) to guaiacyl (G) ratios by MOF oxidation to those obtained by nitrobenzene oxidation (NBO) were nearly identical for three poplars having S:G ratios in the range of 1.25 - 1.68.

When the sample woodmeals were charged with MOF plus oxygen in the presence of 2.0 M NaOH, high yields totaling 40 mole% - 70 mole% of vanillin, vanillic acid, syringylaldehyde and syringic acid were obtained. An investigation into the optimization of oxygen pressure could only narrow the range from a few psig to 60 psig. Total yield in the range of 20 – 26 mole% could be obtained with only 0.6 M NaOH plus Na2CO3. Although not conclusive, there was a substantial amount of data indicating a decrease in catalyst activity with time.

Keywords: Metal organic frameworks; Metal oxides; S:G ratio; Hardwoods; Lignin oxidation

 
AdviserRaymond C. Francis
SchoolSTATE UNIVERSITY OF NEW YORK COL. OF ENVIRONMENTAL SCIENCE & FORESTRY
SourceMAI/ 49-02, p. , Oct 2010
Source TypeThesis
SubjectsBiochemistry; Organic chemistry; Environmental science; Environmental engineering
Publication Number1482113
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