Kinetic and Thermodynamic Studies on Raney Ni/Al2O3 Adsorption for Deep Desulfurization of Benzene Stream

作者：Cao Yongzheng,Luo Guohua,Zhang Lanxi,Xu Xin,Jin Haibo,Dong Sen,Guo Xuehua

摘要：How to remove trace amount of sulfur in benzene is of significance,and deep desulfurization by Ni-containing absorbents is an efficient and promising method.In this paper,The Raney Ni/Al2 O3 adsorbent was prepared and its kinetic and thermodynamic characteristics on adsorptive desulfurization of benzene were studied.The results showed that Raney Ni/Al2 O3 adsorbent exhibited good adsorption performance.The equilibrium isotherms indicated that the adsorption of thiophene over the Raney Ni/Al2 O3 adsorbent complied with the Freundlich model.The results of adsorption kinetics studies showed that the pseudo-second-order kinetics equation was more advantageous than the pseudo-first-order kinetics equation in describing the adsorption kinetics of thiophene on Raney Ni/Al2 O3.The rate constant value(kp)was positively correlated with the temperature whereas the adsorption mass transfer process was mainly determined by the intraparticle and film diffusion.The adsorption thermodynamic analysis proved that△G~0<0,△H~0>0,and△S~0>0,implying that the adsorption was a spontaneous,entropy-increasing and endothermic process.

发文机构：College of Chemical Engineering Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology Coal Chemical R&D Center of Kailuan Group Hebei Provincial Technology Innovation Center of Coal-based Materials and Chemicals

关键词：RaneyNi/Al2O3DESULFURIZATIONadsorptionkineticsadsorptionthermodynamic

分类号： O64[理学—物理化学]