Ultra-deep adsorptive desulfurization of a model diesel fuel on regenerable Ni-Cu/纬-Al₂O₃ at low temperatures in absence of hydrogen

详细信息    查看全文

• 作者：Ali Mansouri ; Abbas Ali Khodadadi ; ^{khodadad@ut.ac.ir" class="auth_mail} ; Yadollah Mortazavi
• 关键词：Adsorptive desulfurization ; Diesel fuel ; Dibenzothiophene ; Nickel ; Copper
• 刊名：Journal of Hazardous Materials
• 出版年：30 April, 2014
• 年：2014
• 卷：271
• 期：Complete
• 页码：120-130
• 全文大小：3010 K

文摘

A model diesel fuel containing 250 ppmw sulfur (as dibenzothiophene) in n-hexadecane was desulfurized at low temperatures in absence of hydrogen, down to about zero ppmw S on a novel adsorbent of well dispersed 3-12 nm Ni_x鈭扖u_10鈭?em>x (x = Ni wt%) nanoparticles formed by impregnation on 纬-Al₂O₃ and reduced in H₂ at 275 or 450 掳C. The sorbents were characterized by XRD, TEM-EDX, FESEM-EDS, H₂-TPR, TPO, BJH and BET surface area measurement techniques. Effects of various parameters comprising Cu content, reduction and desulfurization temperatures, inhibition by naphthalene, and regeneration of spent sorbents were investigated. As copper is added to nickel: (a) the sorbent reduction temperature shifts to dramatically lower values, (b) sulfur adsorption capacity of the sorbents at lower reduction and desulfurization temperatures is significantly improved, and when 14 wt% Ni5Cu5 sorbent is added to the fuel, the sulfur content reduces from 250 ppmw S to about zero in less than 1 min, (c) loss of adsorption capacity after the regeneration of the spent sorbent reduced at 275 掳C is significantly diminished, and (d) the selectivity of the sorbents to dibenzothiophene in the presence of naphthalene is improved. A higher reduction temperature tends to agglomerate nickel nanoparticles and reduce the sulfur adsorption capacity.