# How to produce dry pure oxygen

I'm supposed to produce dry and pure oxygen using the decomposition of hydrogen peroxide with a manganese dioxide catalyst.

$$\ce{2H2O2 (aq) → 2H2O (l) + O2 (g)}$$

The gas will be collected in a bottle by downward displacement of water. How can I safely move the oxygen gas through the drying agent without mixing in atmospheric gas?

• Is it for a laboratory experiment? What is the scale of such production? – Jaroslav Kotowski Aug 11 '15 at 11:09
• Since you're collecting the oxygen over water why bother ?!? – MaxW Apr 20 '17 at 19:08

Most inorganic desiccants should not react with diatomic oxygen; as long as the oxygen is produced separately from the desiccant, there should be no issue. (Dropping 90% or stronger $\ce{H2O2}$ on many substances can cause dangerously rapid decomposition, but with 30% or lower concentration, that danger is minimal.)