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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.

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
 * Net reaction: 2 H2O → 2 H2 + O2