Desulfurization of Diesel Fuels by Adsorption via π-Complexation with Vapor-Phase Exchanged Cu(I)−Y Zeolites

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

doi:10.1021/ja039304m

Cited by 325 publications

(265 citation statements)

References 18 publications

(34 reference statements)

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“…10,[12][13][14][15][16] The setup consisted of a low-flow liquid pump, feed tanks, and a heating element. Initially, the sorbents were loaded inside the adsorber, and pretreated in situ using dry gases to avoid exposure to atmospheric moisture.…”

Section: Fixed-bed Adsorption/breakthrough Experimentsmentioning

confidence: 99%

“…More details on the GC analysis could be found elsewhere. [12][13][14][15][16] For standards, stock solutions consisting of benzothiophene (BT) and 2-methylbenzothiophene (MBT) in sulfur-free n-octane were further diluted sequentially to known concentrations and then injected for elution time determination.…”

Section: Gas Chromatograph Analysismentioning

confidence: 99%

“…[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. In particular, the Cu(I)-Y zeolite (vapor-phase ion exchange or VPIE) showed the highest selectivity and capacity for sulfur from the transportation fuels.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Fixed-bed Adsorption/breakthrough Experimentsmentioning

confidence: 99%

Section: Gas Chromatograph Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Adsorption and Ultrasound-Assisted Sorbent Regeneration

Wang¹,

Ma²,

Yang³

2006

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show abstract

“…The commonly used catalysts are the sulfide Co-Mo/ Al 2 O 3 or Ni-Mo/Al 2 O 3 catalysts [11]. It has been shown that substituted dibenzothiophene (DBT) species are less reactive because of the presence of the methyl groups that create steric hindrance during the interaction of sulfur with catalysts' active sites [12].…”

Section: Introductionmentioning

confidence: 99%

Assessment of the desulfurization of FCC vacuum gasoil and light cycle oil using ionic liquid 1-butyl-3-methylimidazolium octylsulfate

Sefoka

Mulopo

2017

Int J Ind Chem

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Increasingly stringent fuel sulfur content requirements/legislations have resulted in intensive quest for alternative desulfurization technologies that will ensure the treatment of fuels to acceptable sulfur levels. In this regard, the extraction of sulfur compounds from gasoline and diesel oil by ionic liquids (ILs) may represent a green alternative to common hydrodesulfurization for deep desulfurization (\10 ppm sulfur). This paper investigates the extraction efficiency as well as the regeneration of the IL, 1-butyl-3-methylimidazolium octylsulfate ([BMIM][OcSO 4 ]) for the desulfurization of the fluid catalytic cracking diesel fuels. The IL was found to be effective in the selective removal of sulfur from FCC light cycle oil than from the FCC vacuum gasoil stream, achieving 96 and 22.1% sulfur removals, respectively. These results suggest that fuel sulfur content and stream composition affects the extraction efficiency and effectiveness of IL. In addition to the fundamental experiments with FCC diesel fuels, the regeneration of sulfur loaded ILs was studied and a preliminary strategy for the integration of an IL-extraction process into an existing refinery structure is briefly discussed. Regenerated [BMIM][OcSO 4 ] IL was used for desulfurization of diesel and achieved highest sulfur removal of 95%. The IL was regenerated up to four times without appreciable decrease in efficiency. The results obtained herein show that ILs may be effective in the desulfurization of real diesel oils.

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“…On the other hand, silver ion can create p complex with thiophene by p-type bonds. Agzeolite has high adsorption of thiophene because of thiophene as a soft base related to Ag as a soft acid (Ma et al 2005;Hernandez-Maldonado and Yang 2004;Yang and Hernandez-Maldonado 2003;Hernández-Maldonado and Yang 2003;Gong et al 2009;Laborde-Boutet et al 2006;Qin et al 2014). …”

Section: Introductionmentioning

confidence: 99%

Optimization of sulfur adsorption over Ag-zeolite nanoadsorbent by experimental design method

Bakhtiari

Abdouss

Bazmi³

et al. 2016

Int. J. Environ. Sci. Technol.

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Environmental protection has mentioned the need to cut out all of fuels sulfur compounds. One of the most important processes that affect sulfur removal in atmospheric condition is the interaction of liquid fuels with solid sulfur removal adsorbents such as zeolites. To investigate the nano-AgX-zeolite efficiency for the sulfur adsorption process, a set of experimental tests was arranged and conducted by Box-Behnken design software, in an adsorption laboratory setup. The selected variables comprised metal percent, adsorption temperature and calcination temperature. The parameter levels were 0.5-10 %, 30-120 and 200-500°C, respectively. The experiment results were used to find the statistical model. The results demonstrate that the sulfur concentration level is 48.36 ppm in the last product at 83°C for adsorption temperature, 5.53 % for metal percent and 436°C for calcination temperature in constant pH and constant process time.

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Desulfurization of Diesel Fuels by Adsorption via π-Complexation with Vapor-Phase Exchanged Cu(I)−Y Zeolites

Cited by 325 publications

References 18 publications

Adsorption and Ultrasound-Assisted Sorbent Regeneration

Adsorption and Ultrasound-Assisted Sorbent Regeneration

Assessment of the desulfurization of FCC vacuum gasoil and light cycle oil using ionic liquid 1-butyl-3-methylimidazolium octylsulfate

Optimization of sulfur adsorption over Ag-zeolite nanoadsorbent by experimental design method

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