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Having just read your article on hydrogen peroxide manufacturing (here).  I would like to know the reverse process..how can you separate hydrogen peroxide into hydrogen and oxygen?

This is easily done.  Just expose hydrogen peroxide to air.  The oxygen in the air will oxidize the hydrogen peroxide into oxygen and water.  It happens far too slowly for industrial or most other purposes (an enzyme catalyst can be used to speed up the process).  However, neither water nor oxygen are produced in this manner in industry.  The enzyme catalyst is called "catalase" and if I remember correctly, it can be found in potatoes.