Desulfurization of Organosulfur Compounds with Lithium and Sodium

Yu, Zhengkun; Verkade, John G.

doi:10.1021/ef9800260

Cited by 11 publications

(3 citation statements)

References 56 publications

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“…It has been reported that dibenzothiophene (DBT) undergoes carbon−sulfur bond cleavage with K in tetrahydrofuran to form thiophenol and biphenyl. A recent study demonstrated that DBT could be desulfurized under relatively mild conditions by alkali metals such as Li, Na, and K to give biphenyl − The role of K has been discussed in terms of geometric or electronic effects on the catalyst surface.…”

Section: Introductionmentioning

confidence: 99%

Adsorptive Removal of Organic Sulfur Compounds from Jet Fuel over K-Exchanged NiY Zeolites Prepared by Impregnation and Ion Exchange

Velu

Song

Engelhard

et al. 2005

Ind. Eng. Chem. Res.

109

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NiY zeolites with different Ni loadings were synthesized by incipient wetness impregnation and liquid-phase ion-exchange methods using NH 4 Y and KY zeolites. These Ni-containing Y zeolites were tested as adsorbents for removing organic sulfur compounds from a model jet fuel containing 510 ppmw sulfur and a real JP-8 jet fuel containing 380 ppmw sulfur under ambient conditions either without reduction or after reduction around 600 °C. At the adsorption temperature of 80 °C, NiY zeolite containing 30 wt % Ni synthesized by incipient wetness impregnation of NH 4 Y zeolite was able to clean only about 10 mL of a model jet fuel per gram of the adsorbent to produce a desulfurized fuel containing below 1 ppmw sulfur. Under the same experimental conditions, a K-containing NiY zeolite cleaned about 30 mL of the fuel per gram of the adsorbent. A better sulfur adsorption performance was observed when the NiY zeolite was synthesized by ion exchange and reduced before sulfur adsorption. The reducibility and surface properties of some of the selected NiY zeolites were investigated by temperature-programmed reduction (TPR) and in-situ X-ray photoelectron spectroscopy (XPS). TPR studies indicated that the reducibility of NiY zeolite was improved when K was present as a cocation. The in situ XPS studies of unreduced and reduced samples revealed that the presence of K as a cocation in the zeolite matrix helps Ni dispersion at the surface. The promoting effect of K on the sulfur adsorption performance of NiY zeolites was therefore attributed to improved reducibility and surface dispersion of Ni when K was present as a cocation.

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Section: Introductionmentioning

confidence: 99%

Adsorptive Removal of Organic Sulfur Compounds from Jet Fuel over K-Exchanged NiY Zeolites Prepared by Impregnation and Ion Exchange

Velu

Song

Engelhard

et al. 2005

Ind. Eng. Chem. Res.

109

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“…Slow alkali metal reduction of aromatic sulfur compounds in hydrocarbon solvents can occur at high temperatures . With M−SG the reduction of dibenzothiophene in THF to biphenyl by continuous (stage 0) and batch reactions (0 and I) is readily accomplished at room temperature.…”

mentioning

confidence: 99%

“…Slow alkali metal reduction of aromatic sulfur compounds in hydrocarbon solvents can occur at high temperatures. 8 With M-SG the reduction of dibenzothiophene in THF to biphenyl by continuous (stage 0) and batch reactions (0 and I) is readily accomplished at room temperature. Even the normally difficult desulfurization of 4,6-dimethyl dibenzothiophene occurred in a batch process with stage 0 material.…”

mentioning

confidence: 99%

Alkali Metals Plus Silica Gel: Powerful Reducing Agents and Convenient Hydrogen Sources

et al. 2005

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Alkali metals absorbed into silica gel yield three stages of unique loose black powders (M-SG) that are strong reducing agents. All react nearly quantitatively with water to form hydrogen. Liquid Na-K alloys form air-sensitive powders at room temperature that can be converted at 150 degrees C to a form that is sensitive to moisture but not to dry air. Slowly heating sodium and silica gel to 400 degrees C yields a third type that can be handled in ambient air with only slow degradation by atmospheric moisture. These materials eliminate many hazards associated with pure alkali metals and provide easily handled reducing agents and hydrogen sources. They could be used in continuous-flow reactors to reduce and protonate aromatics, dechlorinate alkyl and aryl halides, and desulfurize various compounds.

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Aromatic Metamorphosis of Thiophenes by Means of Desulfurative Dilithiation

Kaga

Iida

Tsuchiya

et al. 2021

Chemistry A European J

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A new mode of aromatic metamorphosis has been developed, which allows thiophenes and their benzo‐fused derivatives to be converted to a variety of exotic heteroles. This transformation involves 1) the efficient generation of key 1,4‐dianions by means of desulfurative dilithiation with lithium powder and 2) the subsequent trapping of the dianions with heteroatom electrophiles in a one‐pot manner. Via the desulfurative dilithiation, the sulfur atoms of thiophenes are replaced also with a carbon–carbon double bond or a 1,2‐phenylene for the construction of benzene rings.

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Desulfurization of Organosulfur Compounds with Lithium and Sodium

Cited by 11 publications

References 56 publications

Adsorptive Removal of Organic Sulfur Compounds from Jet Fuel over K-Exchanged NiY Zeolites Prepared by Impregnation and Ion Exchange

Adsorptive Removal of Organic Sulfur Compounds from Jet Fuel over K-Exchanged NiY Zeolites Prepared by Impregnation and Ion Exchange

Alkali Metals Plus Silica Gel: Powerful Reducing Agents and Convenient Hydrogen Sources

Aromatic Metamorphosis of Thiophenes by Means of Desulfurative Dilithiation

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