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Related Concept Videos

Preparation and Reactions of Thiols02:33

Preparation and Reactions of Thiols

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Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
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Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Related Experiment Video

Updated: Jun 29, 2025

The Effect of Interfacial Chemical Bonding in TiO2-SiO2 Composites on Their Photocatalytic NOx Abatement Performance
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Engineering surface framework TiO6 single sites for unprecedented deep oxidative desulfurization.

Shen Yu1, Zhan Liu1,2, Jia-Min Lyu1

  • 1Laboratory of Living Materials at the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China.

National Science Review
|April 5, 2024
PubMed
Summary

Highly accessible titanium sites in mesoporous titanium silicates significantly boost catalytic oxidative desulfurization (ODS) of fuels. This breakthrough offers efficient removal of harmful organosulfur compounds, enhancing fuel quality and environmental safety.

Keywords:
electrostatic interactionsframework hexa-coordinated Ti sitemesoporous materialsoxidative desulfurizationself-assembly

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Area of Science:

  • Catalysis
  • Materials Science
  • Environmental Chemistry

Background:

  • Catalytic oxidative desulfurization (ODS) is key for removing organosulfur compounds from fuels.
  • Controlling accessible and stable titanium (Ti) active sites in titanium silicates for ODS remains a challenge.

Purpose of the Study:

  • To identify the most active Ti species for ODS in titanium silicates.
  • To develop a method for creating highly accessible and stable framework Ti active sites.
  • To evaluate the ODS performance of the novel catalyst for automotive fuels.

Main Methods:

  • Density functional theory (DFT) calculations to determine active sites.
  • Synthesis of mesoporous titanium silicates with homogeneously distributed single Ti sites.
  • Experimental evaluation of catalytic oxidative desulfurization (ODS) performance.

Main Results:

  • Framework hexa-coordinated Ti (TiO6) species are identified as the most active sites for ODS.
  • A novel method successfully created highly accessible and stable surface framework TiO6 single sites.
  • The new catalyst achieved 920 ppm benzothiophene removal in 60 min at 60°C, surpassing existing catalysts.
  • Efficient removal of bulky 4,6-dimethyldibenzothiophene (DMDBT) was achieved 5x faster than current best catalysts.

Conclusions:

  • Surface framework TiO6 single sites in mesoporous titanium silicates are highly effective for ODS.
  • The developed catalyst offers superior performance and efficiency for removing organosulfur compounds from fuels.
  • The catalyst is scalable and suitable for industrial application in ODS, minimizing energy consumption.