Performance of Adsorptive Desulfurization over Modified NaY Zeolite

A series of adsorbents involving modified NaY zeolite used for fuel oil desulfurization were prepared by liquid phase ion exchange.The results show that the AgY has the highest sulfur adsorbing capacity,followed by CuY、NiY、CeY、ZnY,and the adsorbing capacity for sulfur compounds is in the order of thiophene benzothiophene dibenzothiophene.Orthogonal design was applied and relevent experimental data were analyzed with variance analysis method.The optimized preparation parameters of the adsorbents are as follows: active component,Ag+;ion exchange capacity,4 times of equimolar Na+;calcination duration,8 h;calcination temperature,450℃.Under such conditions,the breakthrough and saturation sulfur adsorbing capacity for thiophene are 15.1 mg·g-1,and 25.3 mg·g-1 respectively.The effects of various hydrocarbons on the competitive adsorption of thiophene were investigated as well.It was observed that the influence on the adsorbing capacity of modified NaY for thiophene of aromatics is more obvious than that for olefin.