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Redox Reactions01:24

Redox Reactions

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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
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Oxidation–Reduction Reactions
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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.
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Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Flash Infrared Annealing for Perovskite Solar Cell Processing
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Microwave-Driven Reduction Accelerates Oxygen Exchange in Perovskite Oxides.

Aitor Domínguez-Saldaña1, Alfonso J Carrillo1, María Balaguer1

  • 1Instituto de Tecnología Química, (Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas), Valencia 46022, Spain.

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|December 4, 2024
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Microwave-assisted oxide reduction electrifies thermochemical cycles for oxygen production. This method enables faster, lower-temperature air separation using titanate perovskites.

Keywords:
air separationchemical loopingmicrowavesoxygenperovskitesredox cycles

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Renewable Energy

Background:

  • Thermochemical cycles offer pathways for renewable hydrogen production and air separation.
  • Conventional methods like cryogenic air separation are energy-intensive.
  • Titanate perovskites are typically used in high-temperature thermochemical cycles.

Purpose of the Study:

  • To investigate microwave-assisted oxide reduction for electrifying thermochemical cycles.
  • To explore the application of microwaves in oxygen generation for air separation.
  • To reduce the operational temperature requirements for titanate perovskite-based cycles.

Main Methods:

  • Utilizing microwave irradiation to activate oxide reduction in titanate perovskites (CaTi1-xMnxO3-δ).
  • Performing thermochemical cycles for oxygen (O2) absorption and desorption.
  • Analyzing the performance of CaTi0.8Mn0.2O3-δ under microwave heating.

Main Results:

  • Microwave activation significantly reduced operational conditions for the reduction reaction.
  • Achieved rapid absorption-desorption cycles, completing in under 3 minutes.
  • Demonstrated a cycle-averaged O2 production of 2.6 mL g⁻¹ min⁻¹ at 800 °C for CaTi0.8Mn0.2O3-δ.

Conclusions:

  • Microwave-assisted oxide reduction is a promising electrification strategy for thermochemical cycles.
  • This approach enables efficient thermochemical air separation with faster cycles at moderate temperatures.
  • The findings present a viable alternative to conventional cryogenic air separation.