Sunday, 6 November 2016

Synthesis and characterization of a polyoxometalate-based ionic liquid catalyst for delignification of wood biomass

Published Date
Volume 50, Issue 6pp 1213–1226

Author 
  • Kemal Volkan Ozdokur
  • Muhammad Moniruzzaman 
  •  
  • Jale Yanik
  • Tsutomu
  • OrigFirst  June 
DOI: 10.1007/s00226-016-0844-y



Cite this article as: 
Ozdokur, K.V., Moniruzzaman, M., Yanik, J. et al. Wood Sci Technol (2016) 50: 1213. doi:10.1007/s00226-016-0844-y

Abstract

Conversion of recalcitrant lignocellulosic biomass to renewable and valuable biopolymers has attracted global interest to build up sustainable societies. Delignification of biomass for separating such biopolymers (e.g., cellulose and lignin) has been used as an efficient process. However, conventional delignification methods suffer from considerable drawbacks and cannot be considered as clean processes. In this study, a new type of polyoxometalate (POM) ionic liquid (IL), [(C6N2H11)42][Mo132O372 (CH3COO)30(H2O)72].ca 284 H2O ([1-ethyl-3-methylimidazolium] [Mo132O372 (CH3COO)30 (H2O)72].ca 184 H2O) (abbreviated as [emim]POM), was synthesized and employed as a catalyst in the delignification of wood biomass. The synthesized [emim]POM catalyst was characterized by CNH analysis, Fourier transform infrared spectroscopy, thermogravimetric analysis, and differential scanning calorimetry. The results indicated that the 1-ethyl-3-methylimidazolium [emim] group was appended to a (NH4)42 [Mo132O372(CH3COO)30 (H2O)72].ca 120 H2O POM precursor in which the [emim] group replaced the ammonium group. The [emim]POM catalyst effectively delignified wood in an IL [emim][OAc] (1-ethyl-3-methylimidazolium acetate) system: The lignin content of the produced cellulose-rich material was ca. 7.0 %, much lower than the 32.0 % lignin content of the untreated wood biomass. The delignification efficiency was improved by optimizing IL catalyst loading, the IL concentration, and the reaction conditions. This POM-based IL could be used in the delignification of lignocellulosic biomass to isolate cellulose and lignin for further chemical and mechanical processing.

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http://link.springer.com/article/10.1007/s00226-016-0852-y

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