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Use of Polyoxometalate Catalysts in Ionic Liquids to Enhance the Dissolution and Delignification of Woody Biomass
Author(s) -
Sun Ning,
Jiang Xinyu,
Maxim Mirela L.,
Metlen Andreas,
Rogers Robin D.
Publication year - 2011
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201000272
Subject(s) - ionic liquid , lignin , polyoxometalate , chemistry , cellulose , dissolution , pulp (tooth) , catalysis , solvent , acetone , yield (engineering) , dissolving pulp , nuclear chemistry , organic chemistry , inorganic chemistry , materials science , medicine , pathology , metallurgy
Abstract A well‐known polyoxometalate, [PV 2 Mo 10 O 40 ] 5− , in both acidic (acidic POM, H 5 [PV 2 Mo 10 O 40 ]) and ionic liquid‐compatible form ([C 2 mim]POM, [1‐ethyl‐3‐methylimidazolium] 4 H[PV 2 Mo 10 O 40 ]), has been studied as a catalyst for the dissolution and delignification of wood in the ionic liquid (IL) 1‐ethyl‐3‐methylimidazolium acetate ([C 2 mim]OAc). Differences were observed with variables such as the form of POM, POM loading, and reaction conditions. Generally, the addition of POM leads to a faster dissolution, a lower lignin content in the recovered cellulose‐rich materials (isolated pulp), and a lower isolated yield of lignin due to its oxidation. Acidic POM decreases the lignin content of the pulp without compromising the yield of the pulp. [C 2 mim]POM in the IL facilitates greater delignification (lower lignin content in pulp) than the IL with acidic POM; however, the overall pulp yield is also lower indicating some degradation of the carbohydrates. The POM can be recovered with [C 2 mim]OAc after evaporation of the reconstitution solvent (e.g., acetone/water) and can be reused, albeit with some loss of POM and loss of POM activity under the current conditions.