Competition between reactive adsorption desulfurization and olefin hydrogenation over the NiO/ZnO-Al2O3-SiO2 adsorbent

Reactive adsorption desulfurization (RADS) has high desulfurization activity and low olefin saturation advantages for upgrading the fluidized catalytic cracking of gasoline. The effect of reaction temperature on RADS over the NiO/ZnO-Al2O3-SiO2 adsorbent was investigated. At 350 degrees C, the adsorbent has good desulfurization performance but the olefin hydrogenation saturation is high, especially for C4-C7 olefins. The comparative desulfurization experiment results demonstrate that there is competitive adsorption between sulfides and olefins on the active sites. However, the amount of sulfides adsorbed by the active sites of the adsorbent is obviously more than that of olefins, which means that the hydrogenation of olefins can hardly inhibit the desulfurization reaction. The increase in Ni loading can promote the desulfurization performance but also greatly aggravate olefin hydrogenation.

Automated summary

Reactive adsorption desulfurization (RADS) is effective for upgrading fluidized catalytic cracking of gasoline by achieving high desulfurization activity and low olefin saturation. The temperature has a significant impact on the desulfurization and olefin saturation reactions in RADS. Competitive adsorption between sulfides and olefins occurs at the active sites, but the amount of sulfides adsorbed is higher than that of olefins, indicating that olefin hydrogenation has limited influence on the desulfurization reaction. Increasing the Ni loading can improve desulfurization performance but also intensify olefin hydrogenation.