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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
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Activated manganese(IV) oxide can selectively oxidize allylic and benzylic alcohols via a radical intermediate mechanism. Primary allylic alcohols are oxidized to aldehydes, while secondary allylic alcohols yield ketones. The redox reaction of potassium permanganate with an Mn(II) salt such as manganese sulfate (under either alkaline or acidic conditions), followed by thorough drying, yields the oxidizing agent: activated MnO2. While MnO2 is insoluble in the solvents used for the reaction, the...
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Introduction
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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
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Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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d-π Orbital Interaction Promoting NO Selective Reduction on the Mn-Doped α-Fe2O3(001) Catalyst.

Xueqing Liu1, Siqing Cheng1, Shengnan Yuan1

  • 1College of Chemistry, Chemical Engineering and Materials Science, Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals, College of Geography and Environment, Shandong Normal University, Jinan 250014, P. R. China.

Environmental Science & Technology
|February 18, 2025
PubMed
Summary

Manganese doping in α-Fe2O3 single-atom catalysts enhances ammonia selective catalytic reduction (NH3-SCR) by facilitating N-H and N-O bond cleavage. This improves catalyst efficiency through optimized electronic interactions.

Keywords:
DFT calculationNH3−SCRorbital interactionreaction mechanismα-Fe2O3

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Area of Science:

  • Materials Science
  • Catalysis
  • Surface Chemistry

Background:

  • Efficient low-temperature ammonia selective catalytic reduction (NH3-SCR) catalysts are vital for environmental remediation.
  • Understanding structure-activity relationships on solid surfaces is key to catalyst design.

Purpose of the Study:

  • To investigate the effect of single-atom Mn doping on α-Fe2O3 for NH3-SCR.
  • To elucidate the structure-activity relationship and reaction mechanisms.

Main Methods:

  • Experimental studies combined with density functional theory (DFT) calculations.
  • Analysis of Mn doping effects on reaction pathways (Eley-Rideal and Langmuir-Hinshelwood).

Main Results:

  • Mn doping facilitates N-H bond cleavage in the Eley-Rideal pathway.
  • Mn doping promotes NO adsorption and N-O bond cleavage in the Langmuir-Hinshelwood pathway.
  • Doping introduces unoccupied d orbitals, enhancing d-π interactions with NO and promoting electron transfer.

Conclusions:

  • Mn doping significantly enhances NH3-SCR catalytic efficiency by lowering energy barriers and promoting key bond cleavages.
  • The study highlights the importance of unoccupied d orbitals and d-π interactions in catalyst design.
  • Findings offer insights for developing high-performance NH3-SCR catalysts.