Storage Environment for Precious Metal Catalysts
Briefly describe the storage environment for precious metal catalysts.
Storage Environment for Precious Metal Catalysts
If stored in an unsuitable environment, precious metal catalysts may suffer from moisture absorption, impurity adsorption, or oxidation of active components, directly affecting catalytic performance.
Environmental Conditions
Project | Requirements |
Temperature | 5-35℃ |
Relative Humidity | ≤60% |
Light | Avoid direct sunlight |
Ventilation | Good |
Corrosive Gases | Strictly prohibited (SO₂, HCl, etc. will cause poisoning) |
Packaging and Storage Management
Packaging: Sealed plastic bags (heat-sealed) for standard storage; aluminum foil bags with vacuum or nitrogen flushing for long-term storage (>6 months); outer cartons with shock-absorbing padding for transport.
Management: First-In-First-Out (FIFO) principle; use within 6 months is recommended. Stack height should not exceed 2 meters; regularly inspect packaging integrity.
Storage Duration and Handling
Storage Time | Handling |
<3 months | Use directly |
3-6 months | Dry at 100-120℃ for 2 hours before use |
6-12 months | Performance retest required |
>12 months | Use only after passing retest |
Key performance changes: slow oxidation of the Pt/Pd surface, moisture absorption by the coating, and blockage of active sites due to impurity adsorption.
Transportation Precautions
Transport in enclosed box trucks; do not load alongside other chemicals; handle with care; cover with a tarpaulin during rainy weather.
Summary
Storage guidelines for precious metal catalysts can be summarized as follows: seal against moisture (humidity ≤60%), store away from light at a constant temperature (5–35°C), and use within 6 months. Long-term storage (>6 months) requires nitrogen purging or vacuum packaging; re-inspection is required if storage exceeds 12 months. Catalysts with damaged packaging or moisture exposure must undergo an activity recovery assessment before use. Proper storage is the final step in ensuring the product maintains its factory-specified performance.