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Related Concept Videos

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...
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.
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

Alkenes can be dihydroxylated using potassium permanganate. The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
Oxidative Cleavage of Alkenes: Ozonolysis01:46

Oxidative Cleavage of Alkenes: Ozonolysis

In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.

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Updated: Jun 10, 2026

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
05:47

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts

Published on: August 7, 2018

High-Energy-Facet-Oriented Mesoporous Single-Crystal Metal Oxides for Selective Oxidation Catalysis.

Yangbo Dong1, Tao Wang1, Wei Li1,2

  • 1State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, Jilin, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|June 9, 2026
PubMed
Summary

Researchers developed a new method to create mesoporous single-crystal metal oxides for catalysis. This technique enhances catalytic activity by controlling crystal facets and porosity, leading to high performance in selective oxidation reactions.

Keywords:
mesoporousmetal oxidesselective oxidationsingle‐crystal

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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

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Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Mesoporous single-crystal metal oxides offer high surface accessibility and lattice coherence for heterogeneous catalysis.
  • Synthesizing these materials is challenging due to conflicts between crystallization and pore formation.

Purpose of the Study:

  • To develop a template-free strategy for synthesizing mesoporous single-crystal metal oxides with tunable pore architectures and exposed high-energy facets.
  • To investigate the catalytic performance of these novel materials.

Main Methods:

  • An energy-driven, facet-oriented crystallization strategy was employed.
  • Polyvinylpyrrolidone (PVP) was used as a pore maintainer and surface-energy regulator.
  • The method was applied to various metal oxides like Co3O4, MgO, and NiO.

Main Results:

  • The strategy successfully produced mesoporous single-crystal metal oxides with controlled pore structures and exposed high-energy facets.
  • Mesoporous single-crystal Co3O4 with exposed (111) facets showed excellent performance in selective alkane oxidation (up to 99% conversion and selectivity).
  • Synergistic effects between porosity and active facets were observed to enhance catalytic activity.

Conclusions:

  • The developed method provides a generalizable approach for designing crystallographically defined porous catalysts.
  • This advancement opens new avenues for highly efficient heterogeneous catalysis through precise control of material structure.