New materials technologies for hydrogen generation

Authors: Brown, Ian¹; Bowden, Mark¹; Lendrum, Conrad¹

Source: Materials at High Temperatures, Volume 24, Number 3, September 2007 , pp. 217-223(7)

Publisher: Science Reviews 2000 Ltd

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Abstract:

A thermochemical cycle is described that demonstrates the use of biomass or lignite-derived synthesis gas to reduce New Zealand ironsand, which is subsequently steam-oxidised to generate pure hydrogen. The redox reactions for this cycle have been thermodynamically modelled, giving an indication of the temperature ranges required to achieve water splitting and the potential sensitivity of the process to partial pressures of CO₂. A fixed bed reactor showed reproducible oxide reduction behaviour over 10 redox cycles but only achieved limited conversion to 64% residual Fe₃O₄ (18%Fe). Fluidised bed reactor studies carried over a comparable timeframe using CO/N₂ mixtures demonstrated a high degree of reduction to 76%Fe.

Keywords: biomass; lignite; ironsand; hydrogen generation

Document Type: Research article

DOI: 10.3184/096034007X267376

Affiliations: 1: Industrial Research, PO Box 31-310, Lower Hutt, New Zealand