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Physical Sciences Reviews

Ed. by Giamberini, Marta / Jastrzab, Renata / Liou, Juin J. / Luque, Rafael / Nawab, Yasir / Saha, Basudeb / Tylkowski, Bartosz / Xu, Chun-Ping / Cerruti, Pierfrancesco / Ambrogi, Veronica / Marturano, Valentina / Gulaczyk, Iwona

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Polyoxometalate catalysts for biomass dissolution: understanding and design

Steven P. Kelley
  • Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal QC H3A 0B8, Canada
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/ Paula Berton
  • Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal QC H3A 0B8, Canada
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/ Andreas† Metlen
  • School of Chemistry and Chemical Engineering, Queen’s University Belfast, David Keir Bldg., Stranmillis Rd., Northern Ireland BT9 5AG, United Kingdom
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/ Robin D. Rogers
  • Corresponding author
  • Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal QC H3A 0B8, Canada
  • The University of Alabama, Department of Chemistry, AL, 35487 Tuscaloosa, United States of America
  • 525 Solutions, Inc., P.O. Box 2206, AL, 35403 Tuscaloosa, United States of America
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Published Online: 2018-05-31 | DOI: https://doi.org/10.1515/psr-2017-0190

Abstract

The use of polyoxometalate catalysts for selective delignification of biomass presents a possible route toward using ionic liquids (ILs) to efficiently obtain high-molecular weight biopolymers from biomass. Rapid progress in this area will depend on recognizing and using the link with already well-developed inorganic chemistry in ILs pursued outside the field of biomass processing. Here, we use crystal structures determined from single crystal X-ray diffraction to better understand the behavior of [PV2Mo10O40]5-, a polyoxometalate catalyst known for its ability to promote selective delignification of biomass in the IL 1-ethyl-3-methylimidazolium acetate ([C2mim][OAc]). The crystal structure of [C2mim]5[PV2Mo10O40]·THF shows the formation of cationic shells around the anions which are likely representative of the interactions of this catalyst with [C2mim][OAc] itself. The reaction of NH4VO3 with [C2mim][OAc] is explored to better understand the chemistry of vanadium(V), which is critical to redox catalysis of [PV2Mo10O40]5-. This reaction gives crystals of [C2mim]4[V4O12], showing that this IL forms discrete metavanadates which are obtained from aqueous solutions in a specific pH range and indicating that the basicity of [OAc]- dominates the speciation of vanadium (V) in this IL.

Keywords: Biomass; Catalysis; Inorganic chemistry; Ionic liquids; Polyoxometalate; Vanadium

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Published Online: 2018-05-31


Citation Information: Physical Sciences Reviews, Volume 3, Issue 8, 20170190, ISSN (Online) 2365-659X, DOI: https://doi.org/10.1515/psr-2017-0190.

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