Low temperature aqueous-phase methanol dehydrogenation to hydrogen and carbon dioxide

Henrik Junge, Elisabetta Alberico, Martin Nielsen, Angèle Monney, Christoph Cordes, Peter Sponholz, Matthias Beller

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Renewable energies like wind and sun light contribute progressively to a sufficient and sustainable energy supply. However, due to its fluctuating occurrence, the storage of electric energy becomes increasingly important. In this respect, approaches for the interconversion of electric and chemical energy earned more attention. A special focus is laid onto carbon dioxide based hydrogen storage in liquid organic materials. Such a material is methanol which possesses a high hydrogen content of 12.6%. While the methanol synthesis from CO2 and H2 is on the way to become reality, further improvements for the dehydrogenation of methanol at milder conditions are still a prerequisite to enable this storage option. We present the efficient low temperature aqueous-phase methanol dehydrogenation process employing molecularly-defined metal complexes. Besides Ru(II) also noble metal free Fe(II) HPNP pincer complexes are able to catalyze this reaction at temperatures between 65-95°C and ambient pressure. Excellent catalyst turnover frequencies of up to 4.700h1 and turnover numbers to > 350.000 have been achieved. By application of a bi-catalytic system containing a second ruthenium complex to accelerate especially the cleavage of formic acid cleavage, generated as intermediate, it was possible to perform a base-free dehydrogenation of methanol as well.

Original languageEnglish
Title of host publication20th World Hydrogen Energy Conference, WHEC 2014
PublisherCommittee of WHEC2014
Pages62-65
Number of pages4
ISBN (Electronic)9780000000002
StatePublished - 2014
Externally publishedYes
Event20th World Hydrogen Energy Conference, WHEC 2014 - Gwangju, Korea, Republic of
Duration: 15 Jun 201420 Jun 2014

Publication series

Name20th World Hydrogen Energy Conference, WHEC 2014
Volume1

Conference

Conference20th World Hydrogen Energy Conference, WHEC 2014
Country/TerritoryKorea, Republic of
CityGwangju
Period15/06/1420/06/14

Keywords

  • Catalysis
  • Hydrogen
  • Iron
  • Methanol
  • Ruthenium

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