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Polyoxometalates in Oxidative Delignification of Chemical Pulps: Effect on Lignin
SUNY-ESF, Department of Paper and Bioprocess Engineering, Syracuse NY, 13210, USA
USDA Forest Service, Forest Products Laboratory, Madison, WI, USA
Cellulose Science International, Madison, WI, USA
* Author to whom correspondence should be addressed.
Received: 23 December 2009; in revised form: 8 March 2010 / Accepted: 12 March 2010 / Published: 16 March 2010
Abstract: Chemical pulps are produced by chemical delignification of lignocelluloses such as wood or annual non-woody plants. After pulping (e.g., kraft pulping), the remaining lignin is removed by bleaching to produce a high quality, bright paper. The goal of bleaching is to remove lignin from the pulp without a negative effect on the cellulose; for this reason, delignification should be performed in a highly selective manner. New environmentally-friendly alternatives to conventional chlorine-based bleaching technologies (e.g., oxygen, ozone, or peroxide bleaching) have been suggested or implemented. In an attempt to find inorganic agents that mimic the action of highly selective lignin-degrading enzymes and that can be applicable in industrial conditions, the researchers have focused on polyoxometalates (POMs), used either as regenerable redox reagents (in anaerobic conditions) or as catalysts (in aerobic conditions) of oxidative delignification. The aim of this paper is to review the basic concepts of POM delignification in these two processes.
Keywords: polyoxometalates; keggin type; lignin; delignification; aerobic; anaerobic; lignin reactions; products
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MDPI and ACS Style
Bujanovic, B.; Ralph, S.; Reiner, R.; Hirth, K.; Atalla, R. Polyoxometalates in Oxidative Delignification of Chemical Pulps: Effect on Lignin. Materials 2010, 3, 1888-1903.
Bujanovic B, Ralph S, Reiner R, Hirth K, Atalla R. Polyoxometalates in Oxidative Delignification of Chemical Pulps: Effect on Lignin. Materials. 2010; 3(3):1888-1903.
Bujanovic, Biljana; Ralph, Sally; Reiner, Richard; Hirth, Kolby; Atalla, Rajai. 2010. "Polyoxometalates in Oxidative Delignification of Chemical Pulps: Effect on Lignin." Materials 3, no. 3: 1888-1903.