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The copper-chlorine cycle (Cu-Cl cycle) is a sequence of thermochemical processes used for hydrogen production.

The Cu-Cl cycle involves four chemical reactions whose net reaction decomposes water into hydrogen and oxygen. All other chemicals are recycled. The Cu-Cl process requires an efficient source of heat.

[edit] Process Description

The four reactions in the Cu-Cl cycle are as follows:

  1. 2 Cu + 2 HCl → 2 CuCl + H2 (430°C - 475°C)
  2. 2 Cu2OCl2 → 4 CuCl + O2 (500°C)
  3. 2 CuCl2 + H2O → Cu2OCl2 + 2 HCl (400°C)
  4. 2 CuCl → CuCl2 + Cu (ambient electrolysis)
Net reaction: 2 H2O → 2 H2 + O2

[edit] References

  • Rosen, M.A., Naterer, G.F., Sadhankar, R., Suppiah, S., "Nuclear-Based Hydrogen Production with a Thermochemical Copper-Chlorine Cycle and Supercritical Water Reactor", Canadian Hydrogen Association Workshop, Quebec, October 19 – 20, 2006. (PDF)
  • Lewis, M. and Masin, J., "An Assessment of the Efficiency of the Hybrid Copper-Chloride Thermochemical Cycle", Argonne National Laboratory, University of Chicago, 2 November 2005. (PDF)