Building upon the fundamental storage requirements previously mentioned, maintaining catalyst activity stability during storage involves implementing measures across two dimensions: general control protocols and category-specific adaptations.
General Core Control Measures
Isolation from Harmful Media: Ensure sealed storage throughout the process, utilizing desiccants or inert gas (nitrogen/argon) blanketing to prevent contact with air or moisture, thereby avoiding oxidation or hydrolysis reactions that could destroy active sites.
Environmental Parameter Stabilization: Maintain storage temperatures within the optimal 20–25°C range, avoiding temperature extremes; implement light-shielding and moisture-proofing measures to prevent decomposition or structural degradation caused by light exposure or high humidity.
Segregation and Protection: Strictly segregate the catalyst from poisons (such as sulfur, phosphorus, and arsenic), strong oxidants, and acidic substances to eliminate cross-contamination and prevent irreversible deactivation due to poisoning.
Physical Protection and Monitoring: Handle gently during loading and unloading to prevent catalyst particles from shattering or losing active components; conduct periodic sampling of activity indicators to promptly detect any anomalies during storage.
Category-Specific Adaptation Strategies
Pyrophoric Catalysts (e.g., Raney Nickel): Must be stored fully submerged in an inert liquid to ensure complete isolation from air, preventing oxidative deactivation or spontaneous combustion.
Metallocene Cocatalysts (e.g., Methylaluminoxane/MAO): Require constant-temperature storage at 20–25°C to prevent phase separation caused by temperatures dropping below 4°C; utilize strict solvent dehydration systems to control environmental moisture.
Organobismuth and Organic Base Catalysts: Store in sealed amber containers to shield from light; purge with inert gas if necessary to prevent component degradation caused by UV radiation or oxygen.
Noble Metal Catalysts (e.g., Ruthenium): Prior to storage, dry at low temperature under vacuum or an inert atmosphere to remove water; subsequently seal and blanket with inert gas (maintaining positive pressure) to isolate the material from external oxygen and trace moisture.
