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

Kemal Volkan Ozdokur, Muhammad Moniruzzaman, Jale Yanik, Tsutomu Ono

Research output: Contribution to journalArticle

5 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1-14
Number of pages14
JournalWood Science and Technology
DOIs
Publication statusAccepted/In press - Jun 24 2016

Fingerprint

delignification
Ionic Liquids
Delignification
catalysts
Ionic liquids
Wood
Biomass
Lignin
catalyst
lignin
Catalysts
synthesis
biomass
cellulose
Cellulose
Biopolymers
biopolymers
thermogravimetry
Bioconversion
calorimetry

ASJC Scopus subject areas

  • Forestry
  • Plant Science
  • Materials Science(all)
  • Industrial and Manufacturing Engineering

Cite this

Synthesis and characterization of a polyoxometalate-based ionic liquid catalyst for delignification of wood biomass. / Ozdokur, Kemal Volkan; Moniruzzaman, Muhammad; Yanik, Jale; Ono, Tsutomu.

In: Wood Science and Technology, 24.06.2016, p. 1-14.

Research output: Contribution to journalArticle

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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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