Competition Adsorption, Equilibrium, Kinetic, and Thermodynamic Studied over La(III)-loaded Active Carbons for Dibenzothiophene Removal

Abstract

La(III)/AC adsorbents were prepared by ultrasonic impregnation. The optimal preparation conditions of La(III)/AC were studied by calcination temperatures and La-loaded amount. Competition adsorption desulfurization from aromatics and adsorption mechanism were investigated onto La(III)/AC. Benzene, methylbenzene and naphthalene were selected to explore adsorption mechanism on dibenzothiophene (DBT). The results showed that La(III)/AC with calcination temperature for 803 K and La-loaded amount for 2 wt % possessed more effective performance of desulfurization. La(III) helped to enhance adsorptive capacity and selectivity, the effective degree of the aromatics over La(III)/AC for DBT removal decreased in the order naphthalene, methylbenzene and benzene. It was founded that the adsorption mechanism was mostly like to be π complex. Adsorption isotherms and kinetics were investigated, and the parameters were obtained. Results showed that adsorption isotherms could be well fitted by Langmuir model and maximum adsorption capacities increased with the temperature increasing. Adsorption kinetics could be represented by pseudo-second-order model, which suggested that chemical reaction along with electronic transfer and share seemed significant in the adsorption rate-controlling step. Adsorption process was spontaneous and exothermic.

Adsorptive Desulfurization of Organic Sulfur from Model Fuels by Active Carbon Supported Mn (II): Equilibrium, Kinetics, and Thermodynamics

“…To study the effects of Nap, benzene, and methylbenzene on competitive adsorption over Mn/AC, several kinds of model oil were prepared by adding 5 wt. % benzene, methylbenzene, and nap with c 0 for 9.38 mmol•L −1 , respectively [32], which were represented by DM1, DM2, and DM3. Mode oils were made with different c 0 of 6.25, 7.81, 9.37, 12.50, 15.63, 18.75, and 21.88 mmol•L −1 .…”

“…K T (L g −1 ) is equilibrium binding constant, b (J mol −1 ) is related to adsorption heat [46]. e correlation coefficients (R 2 ) [47] and the root-meansquare error (RMSE) [32] were used to estimate the fitness of isothermal models; R 2 and RMSE were given as follows:…”

Stability Improvement of FAU Zeolites Ion-Exchanged with Copper–Ammonia Solution for the Removal of Thiophene and Benzothiophene from Model Fuel

“…A wide range of adsorbents have been reported, such as active carbon, metallic oxide, metal–organic framewok, − and zeolite. , Faujasite (FAU)-type zeolites have been applied in many fields due to its large pore size, suitable acidity, size-selective adsorption property, and hydrothermal stability. , There are 192 (Si, A1)­O 4 tetrahedra in every unit cell, and the number of Al atoms per unit cell changes from 96 to 77 (i.e., Si/Al = 1–1.5) for X zeolite and from 76 to 48 (Si/Al = 1.5–3) for Y zeolite . Yang and co-workers have investigated that the Cu + , Ag + , Ni 2+ , and Zn 2+ ion-exchanged FAU Zeolites for selective adsorption desulfurization of transportation fuels.…”

“…3,4 Adsorption desulfurization has attracted much attention because of its mild operation conditions and effective removal of thiophenetype sulfides. 5 A wide range of adsorbents have been reported, such as active carbon, 6 metallic oxide, 7 metal−organic framewok, 8−10 and zeolite. 11,12 Faujasite (FAU)-type zeolites have been applied in many fields due to its large pore size, suitable acidity, size-selective adsorption property, and hydrothermal stability.…”

Synergetic Effect of Cobalt-Incorporated Acid-Activated GAC for Adsorptive Desulfurization of DBT under Mild Conditions

“…Various adsorbents have been tested in the ADS process, including mesoporous silica, ion-exchanged zeolites, alumina, metal–organic frameworks, activated carbon, and so on. − Among these, activated carbon-based adsorbents have gained much attention owing to their high specific area and their controllable functional groups on their surface. The adsorption of sulfur compounds by activated carbon is governed by its porous nature and the functional group present on the activated carbon surface . However, mere activated carbon performance is not that satisfactory in ADS process due to limiting adsorption capacity, which may hinder the industrial application .…”