STABILITY OF NICKEL CATALYSTS: MECHANISMS FOR DEACTIVATION AND REGENERATION

摘要

Raney-type nickel catalysts are exceptionally active for the reduction of several oxyanion and nitrosamine micropollutants using hydrogen as an electron source. The practical applicability of these catalysts, however, has been limited by catalyst instability. The deactivation and regeneration of the catalysts has been well documented for gas phase reactions. The longevity in the aqueous phase, however, has not been thoroughly investigated. The objective of this study is to identify the mechanisms and environmental factors responsible for nickel catalyst deactivation (and reactivation) toward N-nitrosodimethylamine (NDMA) reduction in water.