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Related Concept Videos

Catalysis01:27

Catalysis

Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...
Catalysis02:50

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis01:13

Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis

Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...

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Updated: Jul 4, 2026

Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether
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Coupling catalytic hydrolysis and oxidation for CS2 removal.

Li Wang1, Diyong Wu, Shudong Wang

  • 1Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 160023, China. wangli901@dicp.ac.cn

Journal of Environmental Sciences (China)
|June 26, 2008
PubMed
Summary

This study demonstrates a novel catalytic hydrolysis and oxidation process for efficient carbon disulfide (CS2) removal. Coupling these reactions significantly enhances CS2 degradation rates compared to hydrolysis alone.

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Area of Science:

  • Environmental Chemistry
  • Catalysis
  • Chemical Engineering

Background:

  • Carbon disulfide (CS2) is a toxic and volatile compound requiring effective removal methods.
  • Conventional CS2 hydrolysis is limited by reaction kinetics and potential inhibition.
  • Bi-functional catalysts offer potential for synergistic reaction pathways.

Purpose of the Study:

  • To investigate a coupled catalytic hydrolysis and oxidation process for enhanced CS2 removal.
  • To elucidate the reaction mechanism and kinetics of the bi-functional catalytic system.
  • To determine optimal operating conditions for efficient CS2 degradation.

Main Methods:

  • Utilized a bi-functional catalyst with distinct hydrolysis and oxidation active sites.
  • Investigated the reaction pathway: CS2 -> COS -> H2S -> S/SO4(2-).
  • Analyzed the effect of temperature and oxygen-to-CS2 ratio (O/S) on removal efficiency.

Main Results:

  • Coupled hydrolysis and oxidation achieved a 5-fold increase in CS2 removal rate compared to hydrolysis alone.
  • H2S oxidation effectively eliminated inhibition, maintaining high CS2 hydrolysis rates.
  • Temperature significantly impacts the process; O/S ratio has minimal effect above 2.5.
  • Sulfuric acid formation on the catalyst surface can poison active sites, favoring lower temperatures.

Conclusions:

  • The coupled catalytic system provides a highly efficient method for CS2 abatement.
  • Lower operating temperatures are recommended to mitigate catalyst deactivation by sulfuric acid.
  • This approach offers a promising strategy for industrial applications requiring CS2 removal.