Catalyst Discharge from the Converter

Spent ammonia synthesis eatalyst eontains very small eiystallites of iron, which are extremely reactive, mnch more so than bulk iron metal. These residues are potentially pyrophoric in air and can react with water to produce hydrogen. Extreme care is therefore required when they are discharged from a converter. 

The catalysts are not usually oxidized before being discharged from a converter but, after cooling to ambient temperature, it is important that the converter should not be exposed to air. The converter is usually purged with nitrogen. Catalyst suppliers and contractors provide special instructions for the procedure. Water should be sprayed onto catalyst as it is discharged from the converter. 

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