Desulfurization of Transportation Fuels with Zeolites Under Ambient Conditions

Yang, Ralph T.; Hernández‐Maldonado, Arturo J.; Yang, Frances H.

doi:10.1126/science.1085088

Cited by 869 publications

(503 citation statements)

References 7 publications

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“…In the case of Ox-SO 3 twice oxidation processes of (NH 4 ) 2 S 2 O 8 and the strong oxidant of SO 3 decreased each value of S BET V t and V mic respectively. 8 and/or SO 3 the total acidity was enhanced due to the increase in lactonic phenolic groups as well as acidic groups which would be equivalent to carboxyl group or more stronger acidic groups while the total basic groups on the carbon surface contrarily decreased. The amount of acidic group equivalent to carboxyl group or more stronger acidic groups was followed in the order of Ox-SO 3 > Ox > BAC-SO 3 > BAC which accounted for 1.16 1.05 0.34 and 0.00 meq./g respectively.…”

Section: Thermal Analysismentioning

confidence: 97%

Removal of 4,6-dimethyldibenzothiophene from model diesel fuel using activated carbon with sulfo group

Ono

Amano

Nakamura

et al. 2012

TANSO

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Adsorption of 4 6-dimethyldibenzothiophene (DMDBT) from model diesel fuel was performed using commercial petroleum pitch based activated carbon treated by (NH 4 ) 2 S 2 O 8 in 1 M H 2 SO 4 and/or SO 3 . The treatment of (NH 4 ) 2 S 2 O 8 in 1 M H 2 SO 4 mainly increased the number of carboxyl groups whereas the introduction of sulfo group was observed for SO 3 treatment. The adsorption of DMDBT on each prepared activated carbon followed the tri-Langmuir isotherm. Carboxyl and sulfo groups on the activated carbon surface increased the amount of DMDBT adsorption in which the amount adsorbed for each sulfo group was 6 times greater than that for a carboxyl group. Increasing amounts of 1-methylnaphthalene as an inhibitor caused a decrease in the amount of DMDBT adsorption. However 1-methylnaphthalene did not affect the adsorption on the sites of carboxyl and sulfo groups. When methanol was used as a polar solvent adsorption on carboxyl group sites showed a decrease in the amount of DMDBT adsorption while sulfo groups showed the opposite results. These results were attributed to the oxidation of DMDBT to sulfoxide and/or sulfone by sulfo group on the carbon surface.

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Section: Thermal Analysismentioning

confidence: 97%

Removal of 4,6-dimethyldibenzothiophene from model diesel fuel using activated carbon with sulfo group

Ono

Amano

Nakamura

et al. 2012

TANSO

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“…1 A great deal of attention has been paid to developing new approaches to ultra deep desulfurization of liquid hydrocarbon fuels worldwide. [2][3][4][5][6] Selective adsorption is of particular interest. Various types of adsorbents such as mixed metal oxides, active carbon, clays, zeolites and some novel mesoporous materials have been studied.…”

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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“…Estudos recentes utilizando processo de adsorção empregando adsorventes seletivos têm se mostrado eficientes na remoção deste poluente. [1][2][3][4][5][6] Nas refinarias, a remoção destes contaminantes de combustíveis é executada através do processo de hidrotratamento (hidrogenação catalítica) que também ajusta a especificação dos combustíveis, tal como teores de aromáticos e/ou hidrocarbonetos instáveis. Especificamente, a remoção de enxofre é feita através do processo de hidrodessulfurização (HDS).…”

Section: Introductionunclassified

Estudo de adsorção de compostos sulfurados utilizando um diesel comercial dopado com benzotiofeno e dibenzotiofeno

Scherer¹,

Malvesti²,

Pergher³

et al. 2009

Quím. Nova

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Recebido em 29/10/07; aceito em 24/7/08; publicado na web em 20/1/09 STUDY OF ADSORPTION OF SULPHUR COMPOUNDS EMPLOYING A COMERCIAL DIESEL DOPPED WITH BENZOTHIOPHENE AND DIBENZOTHIOPHENE. Desulphurization process by adsorption was studied employing a commercial diesel dooped with 1000 mg/L of benzothiophene and dibenzothiophene. The adsorbents materials employed were three types of activated alumina (acid, basic and neutral). For comparison, adsorption process was made also using oxidized diesel sample. The results showed that the adsorbents were selective for sulphur compounds removal from fuels. The contact time have influence in adsorption process achieving 80% of removal for not oxidized dibenzothiophene. The three studied alumina types showed similar behavior and a greater selective in dibenzothiophene adsorption than benzothiophene. Dibenzothiophene removal is more effective in samples not oxidized, whereas the benzothiophene was almost totally removed in oxidized sample.Keywords: sulphur compounds; adsorption; fuels. introduçãoCompostos contendo enxofre estão presentes nos derivados de petróleo em concentrações bastante significativas. A presença de compostos sulfurados em frações de petróleo é altamente indesejá-vel, devido à ação corrosiva e poluição atmosférica promovida por gases prejudiciais ao meio ambiente gerados durante a combustão, tais como SO 2 e SO 3 . Com isso, a exigência por combustíveis mais limpos e um rigoroso controle destes poluentes emitidos por automóveis tem levado a uma necessidade de maiores pesquisas na área de remoção de sulfurados em combustíveis, sobretudo diesel e gasolina.Visando uma redução de compostos sulfurados, tem-se buscado constantemente o desenvolvimento de tecnologias para remoção de enxofre de combustíveis. Estudos recentes utilizando processo de adsorção empregando adsorventes seletivos têm se mostrado eficientes na remoção deste poluente. [1][2][3][4][5][6] Nas refinarias, a remoção destes contaminantes de combustíveis é executada através do processo de hidrotratamento (hidrogenação catalítica) que também ajusta a especificação dos combustíveis, tal como teores de aromáticos e/ou hidrocarbonetos instáveis. Especificamente, a remoção de enxofre é feita através do processo de hidrodessulfurização (HDS). 7 Outras rotas alternativas ao hidrotratamento têm sido também usadas com o objetivo de remoção destes contaminantes naturais de derivados de petróleo, tais como o oxitratamento de correntes de derivados instáveis através do uso de um sistema Fenton. 8,9 Além disso, o oxitratamento de diesel pós-hidrotratado tem sido aplicado conjuntamente com uma etapa de adsorção posterior com alumina para remoção de sulfurados oxidados visando a remoção profunda dos sulfurados. 10 O objetivo desse trabalho foi investigar o processo de dessulfurização por adsorção de um diesel comercial dopado com benzotiofeno e dibenzotiofeno usando como material adsorvente três tipos de aluminas ativadas (ácida, básica e neutra). Escolheu-se trabalhar com o diesel comercial no lugar de solvent...

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Desulfurization of Transportation Fuels with Zeolites Under Ambient Conditions

Cited by 869 publications

References 7 publications

Removal of 4,6-dimethyldibenzothiophene from model diesel fuel using activated carbon with sulfo group

Removal of 4,6-dimethyldibenzothiophene from model diesel fuel using activated carbon with sulfo group

Adsorption and Ultrasound-Assisted Sorbent Regeneration

Estudo de adsorção de compostos sulfurados utilizando um diesel comercial dopado com benzotiofeno e dibenzotiofeno

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