Polyoxometalate oxidation of phenolic lignin models

Vladimir A. Grigoriev; Craig L. Hill; Ira A. Weinstock

doi:10.1021/bk-2001-0785.ch018

Polyoxometalate oxidation of phenolic lignin models

Vladimir A. Grigoriev, Craig L. Hill, Ira A. Weinstock

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

A new environmentally friendly technology for wood pulp delignification, based on the use of polyoxometalates (POMs) and oxygen, is being developed. Polyoxometalate solutions that selectively oxidize lignin under anaerobic conditions can be reoxidized by oxygen and also catalyze the aerobic mineralization of the lignin fragments to CO₂ and H₂O, making possible the closed-mill manufacture of paper. Model studies on the oxidation of various lignin-like soluble compounds with POMs suggest that single-electron oxidation of phenolic substructures occurs first, followed by the hydrolysis of cationic intermediates. Detailed physico-chemical studies of the solutions of the alkali-metal salts of POMs show a correlation between the reduction potentials of POMs and the rate of oxidation of a phenolic lignin model that is ascribed to ion pairing between alkali-metal cations and POM anions.

Original language	English
Pages (from-to)	297-312
Number of pages	16
Journal	ACS Symposium Series
Volume	785
DOIs	https://doi.org/10.1021/bk-2001-0785.ch018
State	Published - 1 Jan 2001
Externally published	Yes

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering

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abstract = "A new environmentally friendly technology for wood pulp delignification, based on the use of polyoxometalates (POMs) and oxygen, is being developed. Polyoxometalate solutions that selectively oxidize lignin under anaerobic conditions can be reoxidized by oxygen and also catalyze the aerobic mineralization of the lignin fragments to CO2 and H2O, making possible the closed-mill manufacture of paper. Model studies on the oxidation of various lignin-like soluble compounds with POMs suggest that single-electron oxidation of phenolic substructures occurs first, followed by the hydrolysis of cationic intermediates. Detailed physico-chemical studies of the solutions of the alkali-metal salts of POMs show a correlation between the reduction potentials of POMs and the rate of oxidation of a phenolic lignin model that is ascribed to ion pairing between alkali-metal cations and POM anions.",

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AU - Hill, Craig L.

AU - Weinstock, Ira A.

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AB - A new environmentally friendly technology for wood pulp delignification, based on the use of polyoxometalates (POMs) and oxygen, is being developed. Polyoxometalate solutions that selectively oxidize lignin under anaerobic conditions can be reoxidized by oxygen and also catalyze the aerobic mineralization of the lignin fragments to CO2 and H2O, making possible the closed-mill manufacture of paper. Model studies on the oxidation of various lignin-like soluble compounds with POMs suggest that single-electron oxidation of phenolic substructures occurs first, followed by the hydrolysis of cationic intermediates. Detailed physico-chemical studies of the solutions of the alkali-metal salts of POMs show a correlation between the reduction potentials of POMs and the rate of oxidation of a phenolic lignin model that is ascribed to ion pairing between alkali-metal cations and POM anions.

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Polyoxometalate oxidation of phenolic lignin models

Abstract

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