The effect of hydrogen sulfide in catalytic gasoline on the pre-reaction

Hydrogen sulfide, as an impurity in catalytic gasoline, can have a certain impact on the hydrodesorption pre-reaction. The main manifestations are as follows: 1. Catalyst poisoning: Hydrogen sulfide reacts with the active sites on the catalyst surface, rendering the catalyst surface inactive and thereby reducing the efficiency of the hydrogenation reaction. 2. Crystal lattice poisoning: Hydrogen sulfide reacts with the metal ions in the catalyst’s crystal lattice to form sulfides, thereby poisoning the catalyst’s crystal lattice and further reducing the reaction efficiency. 3. Acidic neutralization: Hydrogen sulfide is a weakly acidic substance that, during the reaction, neutralizes the acidic sites on the surface of the catalyst, reducing its acidity and thereby affecting the progress of the reaction. 4. Formation of sulfides: Hydrogen sulfide also reacts with other components during the reaction process to form water-insoluble sulfides, which result in the presence of dead oil and other harmful components in the product, further affecting its processing and use. All of the above factors can lead to inadequate hydrogenation pre-reaction, thereby reducing the proportion of light gasoline that can be extracted. To address this issue, the following measures can be taken: increasing the amount of catalyst used, raising the temperature and pressure of the hydrogenation reaction, and using low-sulfur feedstocks. .