Conclusion

The new preparation method of activated alumina proposed in this article eliminates the steps of neutralization, aging, filtration and washing, which can not only shorten the preparation time, but also save a lot of water, which is beneficial to reducing production costs and protecting the environment.

When calcined between 450 and 560 °C, the sample mainly exists as amorphous Al2O3; when the roasting temperature exceeds 650 °C, the γ2Al2O3 phase appears. The main function of the pore-forming agent citric acid is to expand the pore size, while the main function of starch is to increase the pore space. Activated alumina has strong acidity and is suitable as a carrier for aromatic hydrocarbon hydrogenation saturation and hydrocracking catalysts.