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Related Concept Videos

Catalysis02:50

Catalysis

32.4K
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.
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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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Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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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...
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Rate-Determining Steps03:08

Rate-Determining Steps

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Relating Reaction Mechanisms
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...
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Microbes and the Sulfur Cycle01:29

Microbes and the Sulfur Cycle

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Sulfur is a vital element in Earth's biogeochemical systems. It transitions through various inorganic states, including sulfate (SO₄²⁻), elemental sulfur (S⁰), and sulfide (S²⁻). Abiotic and biological mechanisms across oxic and anoxic environments intricately mediate these transformations. Sulfate, the most oxidized form of sulfur, is predominantly stored in rocks, marine sediments, and oceanic waters, acting as a long-term reservoir in the global sulfur...
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Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

6.0K
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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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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H2O2-Driven Sulfate Formation at Air-Water Interfaces: Stepwise Mechanism and Accelerated Kinetics.

Yuchen Zhang1, Xiaohua Yang1, Jinkai Gu1

  • 1State Key Laboratory of Environment Characteristics and Effects for Near-space, Key Laboratory of Cluster Science, Ministry of Education of China, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China.

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Hydrogen peroxide (H2O2) accelerates sulfate production at air-water interfaces, crucial for understanding fine particulate matter (PM2.5) and climate impacts. This study reveals the interface

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Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
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Area of Science:

  • Atmospheric Chemistry
  • Environmental Science
  • Physical Chemistry

Background:

  • Sulfate is a major component of fine particulate matter (PM2.5), significantly impacting climate and air quality.
  • Hydrogen peroxide (H2O2) is the primary oxidant for global sulfate production, but its interfacial acceleration mechanism is unclear.

Purpose of the Study:

  • To elucidate the molecular mechanism of H2O2-driven sulfate production at the air-water interface.
  • To compare interfacial and bulk reaction pathways and identify factors influencing sulfate formation.

Main Methods:

  • Utilized theoretical methods to investigate reaction pathways and energy barriers.
  • Analyzed the role of interfacial electric fields and solvation on reaction kinetics.

Main Results:

  • Identified a preferred prereaction complex at the air-water interface.
  • Revealed a stepwise pathway involving a HOOSO2- intermediate with a low rate-determining barrier (4.1 kcal/mol).
  • Demonstrated lower reaction barriers and shifted rate-determining steps at the interface compared to the bulk phase.

Conclusions:

  • The air-water interface is a critical site for H2O2-driven sulfate production.
  • Interfacial electric fields and solvation significantly reduce reaction barriers (89% reduction).
  • Findings are vital for refining atmospheric aerosol models, especially with increasing H2O2 from wildfires.