Effects of Storage Conditions(light, vacuum and container) on Au/TiO2
Date Issued
2010
Date
2010
Author(s)
Liang, Kai-Hui
Abstract
Several Au/TiO2 catalysts were stored in various conditions at room temperature to determine how their catalytic activity was affected by light, container and vacuum during the storage and which might be the best condition for the storage of Au/TiO2 catalysts by conducting CO oxidation at 0℃. The samples were also characterized by H2-TPR, HR-TEM, XPS and FT-IR. The results showed that light might cause decay of the catalytic activity of Au/TiO2 due to gold agglomeration. The activity of Au/TiO2 was also affected by the material of the container. Catalysts stored in glass vials maintained high activity. However, HDPE bottle and PE bag both caused deactivation of catalyst and reduction of gold, and the influence of the latter was far more significant than that of the former. Moreover, the catalytic activity of Au/TiO2 stored under vacuum decayed substantially, regardless of the variations in light and container. The deactivation might be due to stronger interaction between gold and titanium, since the vacuum samples all had higher gold reduction temperature, smaller gold particle size and higher Au binding energy. Hence, the most effective way to store Au/TiO2 catalysts suggested in this study is to store Au/TiO2 catalysts in atmosphere in the dark, and in containers which would not and interact with Au/TiO2 such as glass vials. Under the condition, the catalyst could maintain high activity for at least 2 years.
Subjects
Au/TiO2
Storage
Deactivation
Type
thesis
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