When we use activated alumina support, it has high temperature resistance and oxidation resistance, which is helpful for some of our work. However, its performance will be affected by surface elements, resulting in a decrease in its use efficiency.
1. All the alumina supports in the transition state contain more or less water, and have some hydroxyl groups and exposed aluminum atoms on the surface, thus showing the characteristics of B acid and L acid, which have an important impact on the performance of the alumina support.
2. The surface acidity is related to the preparation conditions of the product, especially the impurity ions and the heat treatment temperature.
3. Another situation is that the negative ions such as halogen will enhance the surface acidity of activated alumina, and the enhancement of acidity will promote the catalytic effect of alumina itself on hydrocarbon cracking and isomerization.
It can be seen from the above introduction that the factors affecting the performance of the activated alumina carrier are related to factors such as water and temperature, so it is necessary to pay attention to the water content in the production and preparation process, and also pay attention to the above points.