The study of thiophene adsorption onto La(III)-exchanged zeolite NaY by FT-IR spectroscopy.
Zeolites NaY and LaNaY (ion-exchanged with aqueous lanthanum nitrate solution) were used as adsorbents for removing organic sulfur compounds from model gasoline solutions (without and with toluene) and fluid catalytic cracked gasoline in fixed-bed adsorption equipment at room temperature and atmosphere pressure. The adsorptive selectivity for organic sulfur compounds was significantly increased when Na(+) ions in zeolite NaY were exchanged with lanthanum ions. IR spectra of thiophene adsorption indicate that thiophene is adsorbed onto La(3+) ions via direct S-La(3+) interaction and Na(+) ions via pi-electronic interaction for La(3+)-exchanged zeolite NaY, but only via pi-electronic interaction with Na(+) ions for NaY. The amount of adsorbed thiophene on La(3+)-exchanged zeolite Y was slightly decreased by coadsorption of benzene, but greatly reduced on NaY. The adsorption of thiophene via interaction with La(3+) on La(3+)-exchanged zeolite Y is hardly replaced by benzene coadsorption. The direct S-La(3+) interaction might be the essential reason for the evidently improved adsorptive selectivity of LaNaY for removing organic sulfur compounds from solutions containing large amount of aromatics.
Tian
Fuping
F
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, P.O. Box 110, Dalian 116023, China.
Wu
Weicheng
W
Jiang
Zongxuan
Z
Liang
Changhai
C
Yang
Yongxing
Y
Ying
Pinliang
P
Sun
Xiuping
X
Cai
Tianxi
T
Li
Can
C
D000327:Adsorption; D007477:Ions; D007811:Lanthanum / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013876:Thiophenes / Q000737:chemistry*; D017641:Zeolites / Q000737:chemistry*
D007477:Ions; D013876:Thiophenes; D017641:Zeolites; D007811:Lanthanum