Removal of sulfur compounds from naphtha solutions using solid adsorbents

Salem, Abu Bakr S. H.; Hamid, Halim

doi:10.1002/ceat.270200511

Cited by 144 publications

(81 citation statements)

References 8 publications

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“…Scientific efforts focus on oxidation [1,2], photoxidation [3,4] or adsorption . The adsorption based methods applied activated alumina [7,8], zeolites [9], and activated carbons [7,[10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] as adsorbents. The results obtained on the latter materials seem promising [12,22,[26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Role of phosphorus in carbon matrix in desulfurization of diesel fuel using adsorption process

Seredych

Wu²,

Brender

et al. 2012

Fuel

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Adsorptive removal of dibenzothiophene (DBT) and 4, from model diesel fuel with 20 ppmw total concentration of sulfur was investigated on polymerderived carbons with incorporated heteroatoms of oxygen, sulfur and phosphorus. The materials before and after exposure to model diesel fuel were characterized using adsorption of nitrogen, thermal analysis, potentiometric titration, XPS and elemental analysis. The selectivities for DBT and DMDBT adsorption were calculated with reference to naphthalene. The results indicated that the presence of phosphorus, especially in the form of pyrophosphates and P 2 O 5 , increases the capacity and selectivity for removal of dibenzothiophenes. It also affects the adsorption mechanism. Phosphorus suppresses oxidation reactions of DBT and DMDBT. Owing to a possible location of bulky phosphorus groups in pore with sizes between 10-30 Å thiophenic molecules are strongly adsorbed there via dispersive forces. Acidic environment also enhances adsorption via acid-base interactions. Physical adsorption mechanism and stability of surface make these carbons attractive candidates for thermal regeneration.

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Section: Introductionmentioning

confidence: 99%

Role of phosphorus in carbon matrix in desulfurization of diesel fuel using adsorption process

Seredych

Wu²,

Brender

et al. 2012

Fuel

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“…While in case of montmorollinite and palygorskite, the desulphurization yields are very poor. The highest desulphurization capacity of the kaolinite clay may be attributed to its larger surface area and small porous structure enough to retain sulphur bearing molecules [17,19], as also shown by the surface area analysis of the clay sample discussed in earlier section. Secondly, the mineralogical composition of kaolinite also shows that it consists of simple alumino-silicate frame works, which provide better adsorption capacity.…”

Section: Diesel Oilmentioning

confidence: 99%

“…SBA-15, MCM-41 and Fujasite [15][16][17] etc and microporous Zeolites e.g. 5-A, 13-X, ZSM-5 and Y-Zeolite, [18][19][20] . A recent advancement in this field employs desulphurization through π-complexation with cations exchanged Zeolites like Ce-Y, Ag-Y, Cu-Y, Ni-Y etc.…”

Section: Introductionmentioning

confidence: 99%

Desulphurization of Liquid Fuels by Selective Adsorption Through Mineral Clays as Adsorbents

Shakirullah

Ahmad

et al. 2012

J. Chil. Chem. Soc.

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Different clays collected from local sources, including Kaolinite, Montmorollinte, Palygorskite and Vermiculite have been utilized for the selective adsorption of sulphur compounds prevailing in petroleum products i.e. crude oil, kerosene and diesel oil. The desulphurization activity of the clay was compared with the charcoal, ion exchange resins and with each other. Desulphurization was performed in batch operation at different time intervals i.e 1, 3 and 6 hrs at 40 o C temperature. Out of different adsorbents used, Kaoilinte exhibited the maximum desulphurization yield of 60 %, 76 % and 64 % at 6 hrs adsorption incase of crude oil, kerosene and diesel oil respectively. All the mineral clays adsorbents were characterized by surface area, SEM and EDX analysis. The FT-IR study of the desulphurized fractions revealed that mostly high molecular weight thioles and thiophenic compounds were depleted during adsorption process.

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“…Various types of adsorbents such as mixed metal oxides, active carbon, clays, zeolites and some novel mesoporous materials have been studied. [6][7][8][9][10][11][12][13][14] In our previous studies, we have developed a class of sorbents that rely on π-complexation for selective adsorption of organic sulfur molecules from liquid fuels.…”

Section: Section 2: Selective Adsorption Of Sulfur Compounds: Isothermentioning

confidence: 99%

“…3 There has been much recent interest in developing sorbents for selective desulfurization. [4][5][6][7][8][9] We have recently developed a class of sorbents that rely on π-complexation bonding to selectively remove organosulfur molecules from commercial fuels. [10][11][12][13][14][15][16] These sorbents were prepared by using several ion-exchange techniques to introduce d-block metals into zeolites, including Ag These ion-exchanged materials are capable of producing fuels with a total sulfur concentration of less than 1 ppmw.…”

Section: Introductionmentioning

confidence: 99%

Adsorption and Ultrasound-Assisted Sorbent Regeneration

Wang¹,

Ma²,

Yang³

2006

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This work was conducted for the department of Energy. In this work, we developed a class of new sorbents that were highly sulfur sepective and had high sulfur capacities. The study consisted of two sections. Development of the new sorbents is described in Section 1, and Section was a fundamental study, conducted for a better understanding for desulfurization of jet fuels. More details of the results are given blow separately for the two sections. Section 1: Desulfurization of Model Jet Fuels by Adsorption on Carbon-based Sorbents and Ultrasound-Assisted Sorbent RegenerationSeveral high-sulfur-capacity carbon-based adsorbents, CuCl/AC, PdCl 2 /AC, and Pd/AC (where AC denotes activated carbon), were studied for desulfurization of a model jet fuel by selective adsorption of thiophenic molecules. The model jet fuel (150 ppmw-S BT and 250 ppmw-S MBT in 19.75 wt% benzene + 80 wt% n-octane containing 700 ppmw naphthalene) was formulated such that it represented all jet fuels well. In addition, a commercial jet fuel, JP-5 was included in the tests. Comparisons with γ-Al 2 O 3 support and desulfurization of a commercial jet fuel were also studied. The results showed that the selective sulfur adsorption capacity of PdCl 2 was higher than that of CuCl and Pd 0 , in agreement with molecular orbital results. It was also found that the activated carbon is the best support for π-complexation sorbents to remove sulfur-containing compounds, i.e. benzothiophene and methylbenzothiophene. Among all the adsorbents studied, PdCl 2 /AC had the highest capacity for desulfurization. A significant synergistic effect was 3 observed between the carbon substrate and the supported π-complexation sorbent, and this effect was explained by a geometric effect. The saturated sorbent was regenerated by desorption assisted by ultrasound with a solvent of 30 wt% benzene and 70 wt% noctane. The results showed that the amount of sulfur desorbed was higher with ultrasound, 65 wt% desorption vs. 45 wt% without ultrasound in a static system at 50 o C. Section 2: Selective Adsorption of Sulfur Compounds: Isotherms, Heats and Relationship between Adsorption from Vapor and Liquid SolutionThis was a basic study in order to understand and better design sorbents for desulfurization of jet fuels. Adsorption isotherms were measured for thiophenic sulfur compounds, thiophene (T), benzothiopnene (BT), 2-methyl benzothiophene (2-MBT) and dibenzothiophene (DBT), from their binary solutions in n-octane. Two sulfur-selective, π-complexation sorbents were studied: Cu(I)-Y zeolite and PdCl 2 impregnated on activated carbon (PdCl 2 /AC). Vapor-phase isotherms of n-octane and thiophene were also measured. The selectivity of adsorption from liquid solutions followed the order of: T < BT < 2-MBT < DBT for PdCl 2 /AC, and T < DBT < 2-MBT < BT for Cu(I)-Y zeolite. The adsorption bond energies, which approximate the heats of vapor-phase adsorption, followed the order: T < BT < 2-MBT < DBT. This order was not followed for adsorption from liquid solutions on Cu-Y zeolite...

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Removal of sulfur compounds from naphtha solutions using solid adsorbents

Cited by 144 publications

References 8 publications

Role of phosphorus in carbon matrix in desulfurization of diesel fuel using adsorption process

Role of phosphorus in carbon matrix in desulfurization of diesel fuel using adsorption process

Desulphurization of Liquid Fuels by Selective Adsorption Through Mineral Clays as Adsorbents

Adsorption and Ultrasound-Assisted Sorbent Regeneration

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