Patent Number: 
Section: claims

1. A process of treating hydrogen gas liberated from the acid or alkaline dissolution of a metal, the process comprising a step of passing the liberated hydrogen gas through a reactor containing an oxidising agent for oxidation of the hydrogen gas into water, followed by a step of regenerating the oxidising agent, wherein the oxidising agent is diluted with an inert diluent. 2. A process according to claim 1, wherein a step of regenerating the oxidising agent is carried out after each oxidation step. 3. A process according to claim 1, wherein the oxidising agent comprises a metal oxide in bulk form or finely dispersed on the surface of an inert support. 4. A process according to claim 1, wherein the inert diluent comprises stainless steel pellets. 5. A process according to claim 1, wherein the oxidising agent comprises copper oxide. 6. A process according to claim 1, wherein the step of regenerating the oxidising agent comprises passing a gas containing oxygen through the reactor containing the oxidising agent to be regenerated. 7. A process according to claim 1, wherein the metal, the dissolution of which liberates hydrogen gas, comprises uranium. 8. A process according to claim 7, wherein the metal is a uranium-aluminium alloy. 9. A process according to claim 1, wherein the reactor is at least partially immersed in an alumina bath. 10. A process according to claim 1, wherein the alumina bath is supplied with one or more heating elements. 11. An apparatus for carrying out a process according to claim 1, the apparatus comprising a reactor containing an oxidising agent for the oxidation of hydrogen gas into water, wherein the reactor is at least partially immersed in an alumina bath. 12. An apparatus according to claim 11, wherein the alumina bath is supplied with one or more external heating elements. 13. An apparatus according to claim 11, wherein the oxidising agent comprises a metal oxide in bulk form or a metal oxide finely dispersed on the surface of an inert support. 14. An apparatus according to claim 11, wherein the oxidising agent is diluted with an inert diluent. 15. An apparatus according to claim 14, wherein the inert diluent comprises stainless steel pellets. 16. An apparatus according to claim 11, wherein the oxidising agent comprises copper oxide. 17. A process of treating hydrogen gas liberated from the acid or alkaline dissolution of a metal, the process comprising a step of passing the liberated hydrogen gas through a reactor containing an oxidising agent for oxidation of the hydrogen gas into water, wherein the oxidising agent comprises a metal oxide finely dispersed on an inert carrier and/or diluted with an inert diluent. 18. A process according to claim 17, further comprising a step of regenerating the oxidising agent. 19. A process according to claim 17, wherein the metal oxide comprises copper oxide.