Selectivity adsorption of thiophene alkylated derivatives over modified Cu+-13X zeolite

Solid adsorbents Cu+-13X and Cu+-13X loaded with La element were prepared by ion-exchange method. X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to characterize the structure of the prepared zeolite. Adsorption of thiophene with different groups over the two adsorbents was investigated by static adsorption equilibrium and kinetic test. Static equilibrium data were correlated based on the Langmuir model and the modified Langmuir model. Kinetic data were fitted very well by Crank diffusion model. The results revealed that the adsorption capacity of single component over the Cu+-13X loaded with La element increased about 10% as compared to the non-doped Cu+-13X. Fitting results of ηi and De illustrated that loading of the La element into zeolite could change the interaction force between binary components. The kinetic test showed that the competitive adsorption became moderate, and thus resulted in the improvement of the total desulfurization capacity.