Over time, metal catalysts become deactivated due to spoiling caused by contamination from reaction by-products or impurities from raw materials. As a result, they must be periodically replaced or regenerated in order to maintain their initial production or conversion rates. Some types of metal catalysts can be regenerated using hydrogen via reduction. Catalyst performance should be monitored and optimized at all stages of the catalysts life cycle. Look to Air Products to provide the hydrogen or nitrogen supply for catalyst activation or regeneration.