In a study of the phenomenon of catalyst deactivation during storage, Au/TiO2 catalyst was stored under various conditions, viz. vacuum, nitrogen, air, refrigeration, dark, and light, and tested for CO oxidation activity at regular intervals. The data shows that the catalyst deactivates under all the storage conditions over 12 months and that storage in vacuum significantly enhances the rate and extent of deactivation. Storage in light accelerates the deactivation. The catalyst appears to deactivate through a combination of Au(III) reduction, Au nanoparticle agglomeration, loss of surface hydroxyl groups, loss of surface moisture, and accumulation of surface carbonates and formates. The rate and extent of catalyst deactivation can be limited by storing the catalyst in the dark at sub ambient temperature (refrigerator) and under inert atmosphere.

中文翻译：

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CO 氧化：存储过程中 Au/TiO2 催化剂的失活

在对储存过程中催化剂失活现象的研究中，Au/TiO2 催化剂在各种条件下储存，即。真空、氮气、空气、冷藏、黑暗和光照，并定期测试 CO 氧化活性。数据表明，催化剂在所有储存条件下超过 12 个月都会失活，真空储存显着提高了失活的速度和程度。在光照下储存会加速失活。该催化剂似乎通过 Au(III) 还原、Au 纳米颗粒团聚、表面羟基损失、表面水分损失以及表面碳酸盐和甲酸盐积累的组合而失活。通过在低于环境温度（冰箱）和惰性气氛下将催化剂储存在黑暗中，可以限制催化剂失活的速率和程度。