Performance of gamma-AlO decorated with potassium salts in the removal of CS from C cracked distillate.
Journal:
RSC advances
Published Date:
Apr 23, 2021
Abstract
Deep desulfurization is a key process for the production of high value-added products from C distillates. In this work, different potassium salt modified gamma-AlO adsorbents were prepared by an incipient-wetness impregnation method and characterized by N adsorption-desorption, SEM-EDS, TEM, CO-TPD, XRD, FT-IR, and IC. The C distillate with a 1200 μg mL sulfur content is desulfurized to less than 10 μg mL within 24 hours by the static adsorption method. For the desulfurization in the fix-bed reactor, the breakthrough sulfur capacity of KCO-decorated gamma-AlO reaches 0.76 wt% under the optimized conditions, , at 30 °C, with a sulfur content of 50 μg mL in the raw oil, and a liquid hourly space velocity of 1 h. The desulfurization activity of the exhausted adsorbent can be recovered after regeneration. Selective adsorption of CS includes three processes: adsorption, hydrolysis, and oxidation. CS is first adsorbed on the adsorbent and hydrolyzed to form HS. HS is further oxidized to form S/SO , and then deposits on the surface of the adsorbent. Adsorption, hydrolysis, and oxidation all play essential roles in the removal process of CS.
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