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Polymeric metal-oxide anion complexes (polyoxometalates) may provide a means for using transition metals and oxygen (O 2 ) to selectively delignify wood or wood pulp in effluent-free (closed) mills. The development of this chemistry. and associated process concepts, evolved from the observation that certain fungi use transition metals (Cu. Fe and Mn) to selectively transfer electrons from lignin to oxygen. Chemical, physicochemical and engineering issues pertaining to the development of aqueous transition-metal systems for selective delignification, and for mill closure, are outlined in this brief introduction to the title technology.

holzforschung

Selective Transition-Metal Catalysis of Oxygen Delignification Using Water-Soluble Salts of Polyoxometalate (POM) Anions. Part I. Chemical Principles and Process Concepts