Related Experiment Video
Updated: Jun 25, 2026
09:58
Light-driven Enzymatic Decarboxylation
Published on: May 22, 2016
Switching off hydrogen peroxide hydrogenation in the direct synthesis process
Jennifer K Edwards1, Benjamin Solsona, Edwin Ntainjua N
1School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK.
Science (New York, N.Y.)
|February 21, 2009
Summary
Researchers developed a new method for synthesizing hydrogen peroxide (H2O2) directly from hydrogen and oxygen. Acid-treated gold-palladium catalysts prevent H2O2 decomposition, achieving high yields and selectivity.
Area of Science:
- Catalysis
- Materials Science
- Chemical Engineering
Background:
- Hydrogen peroxide (H2O2) is a vital industrial chemical used as a disinfectant and bleaching agent.
- Current H2O2 production relies on an indirect anthraquinone process.
- Direct synthesis of H2O2 from H2 and O2 is desirable but hindered by catalyst-mediated decomposition.
Purpose of the Study:
- To develop a catalyst that enables efficient direct synthesis of hydrogen peroxide.
- To overcome the challenge of H2O2 decomposition during direct synthesis.
- To improve the selectivity and yield of H2O2 production.
Main Methods:
- Utilized gold-palladium alloy nanoparticles supported on carbon.
- Applied an acid pretreatment to the carbon support.
- Investigated the effect of pretreatment on catalyst structure and H2O2 synthesis performance.
Main Results:
- Acid pretreatment effectively deactivated the H2O2 decomposition pathway.
- The treatment resulted in smaller alloy nanoparticles, which likely inhibit decomposition sites.
- Acid-pretreated catalysts achieved high yields of H2O2 with over 95% selectivity.
Conclusions:
- Acid pretreatment of carbon supports is a viable strategy to create stable catalysts for direct H2O2 synthesis.
- This method offers a promising route for more efficient and selective H2O2 production.
- The findings pave the way for improved industrial processes for hydrogen peroxide manufacturing.
Related Concept Videos
02:13Reduction of Alkenes: Catalytic Hydrogenation
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.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the surface of...
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the surface of...
02:44Oxidation 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.
02:17Reduction 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...
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...
02:04Oxidation 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.
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
02:35Regioselectivity of Electrophilic Additions-Peroxide Effect
In the presence of organic peroxides, the addition of hydrogen bromide to an alkene yields the isomer that is not predicted by Markovnikov’s rule. For example, the addition of hydrogen bromide to 2-methylpropene in the presence of peroxides gives 1-bromo-2-methylpropane. This addition reaction proceeds via a free radical mechanism, which reverses the regioselectivity. The free radical reaction mechanism involves three stages: initiation, propagation, and termination.