Ultra-deep adsorptive removal of thiophenic sulfur compounds from FCC gasoline over the specific active sites of CeHY zeolite

Enhanced Adsorption Desulfurization Performance over CuCeY Zeolites Prepared by Low‐Temperature Calcination under H2 Atmosphere

“…1442 cm À 1 can be assigned to the Py adsorbed on the Ce species or Na + ions. [3,38,43,45,78,82] It can be found from Figure 14 that Ce ions could lead to more B acidity whereas Cu ion could lead to more L acidity, which is similar to our previous results. [3,38] According to the previous literatures, [3,17,43,45,82] the high medium and stronge B acid content in Cu 0.015 Ce 0.04 Y zeolite will result in the alkylation between thiophene and 1-hexene and the oligomerization of thiophene or 1-hexene by themselves and thus reduce sulfur adsorption capacity of Cu 0.015 Ce 0.04 Y zeolite.…”

“…[77] Combined with the analysis of XRD and desulfurization performances, Ce 3 + ion species located at SII sites in the supercages are mainly adsorption sites of thiophene for Ce ions of CuCeY zeolites, which is consistent with our previous studies. [3,40,43,45] The Q values of CuCeY zeolites for TOMO are larger than that for TAMO when the concentration of Ce(NO 3 ) 3 ⋅ 6H 2 O in solution is high and thus the decreases of Ce 3 + ion species reduce adsorption selectivity of CuCeY zeolites for sulfur compounds.…”

“…[38,42] It means that adsorptive capacity of CuCeY zeolite for sulfur compounds has the room for improvement. It may be enhanced by further optimizing preparation conditions CuCeY zeolites, such as using the NH 4 Y zeolite as the raw material and thus increasing the ion exchange degree, [43] altering the Si/Al ratio of Y zeolite, [42] adjusting the pH value [42,44] and concentration [3,38,45] of nitrate solution, changing the temperature and atmosphere of calcination, [3,21,39,46] and enlarging the pore diameter of Y zeolite. [46,47]…”

Insight into the nature and the transformation of the hydroxyl species in the CeY zeolite

“…The band at 1503 cm −l (ring stretching fundamental) is related to the thiophene oligomers, implying that oligomerization of thiophene molecules has occurred on the 0.05CeNaY-1-c sample. 6,47…”

“…Among them, the 1395 cm −1 band has been assigned to the symmetric stretching vibration of CvC in the fundamental ring. 46 The 1454 and 1437 cm −1 bands have been assigned to the deformation vibrations of methylene groups (CH 2 ), 6,47 indicating that the protonation reaction of the thiophene molecules occurs on the 0.05CeNaY-1-c sample. The band at 1503 cm −l (ring stretching fundamental) is related to the thiophene oligomers, implying that oligomerization of thiophene molecules has occurred on the 0.05CeNaY-1-c sample.…”