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J Hazard Mater. 2014 Apr 15;270:82-91. doi: 10.1016/j.jhazmat.2014.01.046. Epub 2014 Feb 1.

The enhanced adsorption of sulfur compounds onto mesoporous Ni-AlKIT-6 sorbent, equilibrium and kinetic analysis.

Author information

1
Department of Chemistry, Abdul Wali Khan University, Mardan, K.P.K, Pakistan; State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China. Electronic address: fazle@awkum.edu.pk.
2
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China. Electronic address: zfyancat@upc.edu.cn.
3
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China.
4
Department of Chemistry, Abdul Wali Khan University, Mardan, K.P.K, Pakistan.
5
Department of Chemistry, Sarhad University of Science and Information Technology, Peshawar, K.P.K, Pakistan.

Abstract

High performance nickel supported on mesoporous AlKIT-6 (Si/Al=15, 25, 50, 100) sorbents were prepared by incipient wetness impregnation (IWI) with ultrasonic aid for adsorptive desulfurization of commercial diesel and simulated fuels. The sorbents were characterized by N2 adsorption-desorption, XRD, NH3-TPD, Py-FT-IR, HRTEM, SEM and atomic absorption spectroscopy techniques. The analysis results confirmed that Aluminum atoms entered the framework and 20%Ni-AlKIT-6(15) can still retain three dimensional structure of AlKIT-6(15) and Ni is highly dispersed in the support. The kinetic pseudo second-order model and Langmuir isotherm are shown to exhibits the best fits of experimental data for the adsorption of thiophene (T), benzothiophene (BT) and dibenzothiophene (DBT) over AlKIT-6 and 5-30%Ni-AlKIT-6. Intraparticle diffusion and steric hindrance were the rate controlling step of the adsorption of T and DBT over AlKIT-6(15) and 20%Ni-AlKIT-6(15) as verified through the intraparticle diffusion model. The characterization of regenerated 20%Ni-AlKIT-6(15) revealed that three-dimensional cubic Ia3d symmetric structure was maintained in the sorbent after 6 successive desulfurization-regeneration cycles.

KEYWORDS:

Desulfurization; Isotherm equations; Kinetics; Lewis acid sites; Mesoporous Ni-AlKIT-6; Simulated fuels

PMID:
24556462
DOI:
10.1016/j.jhazmat.2014.01.046
[Indexed for MEDLINE]
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