Application of Macroporous Activated Alumina Ball
Activated alumina is often referred to as γ-Al2O3 or η-Al2O3, they are all defects spinel structure, and with excellent surface properties, such as specific surface area is larger, stronger surface adsorption and surface acid sites, as well as the structure of the porous, macroporous, widely as catalyst and carrier, dry sorbent used in petroleum chemical industry, organic chemical industry, rubber industry, chemical fertilizer industry and environmental protection industries.
Hydrorefining is one of the important means to improve the quality of oil. In a series hydrocracking process, hydrorefining can reduce the impurity content in the feedstock oil and prolong the life of the hydrocracking catalyst. Its main reactions are hydrodemetallization, hydrodesulfurization, hydrodearomatization, hydrodenitrification and so on, among which hydrodenitrification is the most difficult. Catalysts play an important role in the hydrorefining process. It is mainly composed of three parts: metal component, filter aid and carrier. Among them, the activated alumina carrier has a very important effect on the activity, selectivity and stability of hydrofining catalyst. It can increase the active surface of the catalyst and provide the pore structure suitable for the specific reaction, thus improving the activity and selectivity of the catalyst. The dispersion of the active component was increased and the stability of the catalyst was improved.
In the application of environmental protection industry, the activated alumina with large pore volume is mainly used in the catalyst of automobile exhaust gas treatment. In the catalytic converter of automobile exhaust gas, the activated alumina with large pore volume is used in a large number of catalyst carriers. The main function of these catalysts is to promote the oxidation of hydrocarbons and CO to CO2 and H2O. Performance of activated alumina used as catalyst carrier for automobile exhaust gas.
The catalysts prepared by large pore volume activated alumina have higher activity, selectivity and conversion rate than those prepared by small pore volume activated alumina. Therefore, the development of large pore volume activated alumina (0.6 ~ 1.0 mL /g) is the future development direction. It is an effective method to realize the industrialization and mass production of large pore volume activated alumina and also the production direction of activated alumina to transform the original production line with large pore volume activated alumina.
