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Licensed Unlicensed Requires Authentication Published by De Gruyter October 4, 2014

A Mathematical Modeling and Experimental Study on Adsorptive Desulfurization of Model Gasoline Using Synthesized Ni–Y and Ce–Y Zeolites

Maryam Montazerolghaem, Amir Rahimi and Fakhry Seyedeyn-Azad

Abstract

In this study, Ni–Y and Ce–Y zeolites are prepared using synthesized Na–Y zeolite through solid-state ion-exchange method. The adsorptive desulfurization of a model gasoline containing 194, 116 and 72 ppmw sulfur is evaluated in a batch system under ambient conditions. A dynamic model is established in order to investigate the performance of the adsorption process. The model predictions are compared with the obtained experimental results for thiophene adsorption on Ni–Y and Ce–Y zeolites from model solution containing different concentrations of thiophene, and a good agreement is observed. The model parameters: diffusivity and mass transfer coefficient are estimated by comparing the model predictions and experimental data.

Acknowledgment

The support from the Isfahan refinery (R&D and Laboratory) is gratefully acknowledged.

Nomenclature

a

specific surface area, m2 g−1

CA

the concentration of sulfur in the fluid inside the pore, ppmw

CAb

the concentration of sulfur in the bulk solution, ppmw

Cinb

initial concentration of sulfur in the bulk solution, ppmw

C*

the sulfur concentration in the liquid phase at equilibrium with the adsorbed sulfur in the solid, ppmw

DA

internal diffusion coefficient of sulfur inside the adsorbent pellet, m2 s−1

K

mass transfer coefficient, m s−1

L

height of the adsorbent pellet, m

MA

molecular weight of adsorbate, kg kmol−1

q

the sulfur sorbed per unit mass of adsorbent, mg g−1

qm

constant parameter of Langmuir isotherm

R

radius of the adsorbent pellet, m

V

volume of the liquid phase, m3

Greek symbols
α

constant parameter of Langmuir isotherm

εp

porosity of the pellet

ρr

actual density of adsorbent, kg m−3

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Published Online: 2014-10-4
Published in Print: 2014-12-1

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