There are many benefits to adding magnesium oxide to petroleum catalysts. There are also certain characteristic requirements for adding magnesium oxide to petroleum catalysts. The application of petroleum catalysts is very extensive, mainly used in the process of manufacturing oxygen-containing products in petrochemicals, and the vast majority are selective oxidation processes. Benefits of adding magnesium oxide to petroleum catalysts: Magnesium oxide is alkaline and can neutralize acidic substances, improving the stability of the catalyst; magnesium oxide can adsorb water vapor and hydrogen sulfide and other impurities, enhancing the adsorption performance of the catalyst; magnesium oxide can serve as a catalyst carrier, which is conducive to improving the adsorption performance of the catalyst for water vapor and hydrogen sulfide. Requirements for magnesium oxide in petroleum catalysts: High purity is required: petroleum catalysts usually require high-purity magnesium oxide to ensure the activity and stability of the catalyst; uniform particle size is required: the more uniform the particle size distribution of magnesium oxide, the better the performance of the catalyst. Therefore, there are certain requirements for the particle size distribution of magnesium oxide in petroleum catalysts; excellent surface properties are required: the chemical and physical properties of the magnesium oxide surface have a significant impact on the activity and stability of the catalyst, so there are corresponding requirements for the surface properties of magnesium oxide in petroleum catalysts. The reason for adding magnesium oxide to petroleum catalysts is that magnesium oxide itself is an alkaline substance and has an acid-base neutralization effect on acidic substances. During the acid-base neutralization process, it plays an adsorption role. Therefore, the content, fineness, uniform distribution of particle size, and specific surface area of magnesium oxide have a significant impact on the adsorption performance of magnesium oxide.