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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...

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Updated: Jun 8, 2025

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

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

Published on: December 6, 2021

In Situ Nanoconfinement Catalysis for Highly Efficient Redox Transformation.

Yuhan Chen¹, Jisheng Tan¹, Jingbo Chao²

¹State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.

ACS Applied Materials & Interfaces

|November 1, 2024

Summary

This summary is machine-generated.

This study introduces in situ nanoconfinement catalysis (iNCC) for rapid hexavalent chromium (Cr(VI)) remediation. The new method achieves >99% Cr(VI) reduction in one minute across a wide pH range.

Keywords:

Al alloy intermetallic Al−Mg−Fe alloy hexavalent chromium in situ layered double hydroxide in situ nanoconfinement catalysis intercalation reaction redox transformation

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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:

Environmental Chemistry
Materials Science
Nanotechnology

Background:

Hexavalent chromium (Cr(VI)) poses significant environmental and health risks.
Efficient remediation of Cr(VI) across diverse pH conditions remains a challenge.

Purpose of the Study:

To develop a novel in situ nanoconfinement catalysis (iNCC) approach for effective Cr(VI) remediation.
To investigate the catalytic performance of in situ layered double hydroxide (iLDH) nanosheets grown on an Al-Mg-Fe alloy.

Main Methods:

Synthesis of iLDH nanosheets on an Al-Mg-Fe alloy surface.
Evaluation of Cr(VI) reduction rates under varying pH conditions (pH 3-11).
Kinetic analysis of the catalytic reduction process.

Main Results:

Achieved >99% Cr(VI) reduction within 1 minute at a concentration of 100 mg L⁻¹.
Demonstrated a high rate constant of 201 h⁻¹ for Cr(VI) reduction.
Observed significantly lower reduction (<6% in 12 h) with the pristine alloy.

Conclusions:

In situ nanoconfinement catalysis (iNCC) offers a highly efficient method for Cr(VI) remediation.
Synergistic effects of alloy components and iLDH nanoconfinement enhance Cr(VI) reduction.
The study highlights the potential of iNCC for redox transformation in environmental applications.