Recent progress in molecular transition metal catalysts for hydrogen production from methanol and formaldehyde

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Abstract
Hydrogen is considered as a potential alternative and sustainable energy carrier, but its safe storage and transportation are still challenging due to its low volumetric energy density. Notably, C1-based substrates, methanol and formaldehyde, containing high hydrogen contents of 12.5 wt% and 6.7 wt%, respectively, can release hydrogen on demand in the presence of a suitable catalyst. Advantageously, both methanol and aqueous formaldehyde are liquid at room temperature, and hence can be stored and transported considerably more safely than hydrogen gas. Moreover, these C1-based substrates can be produced from biomass waste and can also be regenerated from CO2, a greenhouse gas. In this review, the recent progress in hydrogen production from methanol and formaldehyde over noble to non-noble metal complex-based molecular transition metal catalysts is extensively reviewed. This review also focuses on the critical role of the structure–activity relationship of the catalyst in the dehydrogenation pathway.
Funding Information
  • Indian Institute of Technology Indore
  • Anusandhan National Research Foundation (CRG/2021/000504)
  • Council of Scientific and Industrial Research, India (01(3045)/21/EMR-II)

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