Related Experiment Video
Updated: Jul 16, 2026
08:15
Temperature-programmed Deoxygenation of Acetic Acid on Molybdenum Carbide Catalysts
Published on: February 7, 2017
Interlayer Confinement Steers Peracetic Acid Activation Toward Nearly Exclusive Singlet Oxygen Generation
Guang Li1, Xinying Chen1, Mengfan Liu1
1College of Environmental Science and Engineering, Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tianjin, China.
Angewandte Chemie (International Ed. in English)
|July 15, 2026
Summary
This study introduces interlayer confinement to control peracetic acid activation, favoring singlet oxygen generation over radicals for robust water treatment. This strategy enhances catalyst stability and efficiency.
Area of Science:
- Catalysis
- Materials Science
- Environmental Chemistry
Background:
- Selective oxidation chemistry requires precise control over reaction pathways.
- Peracetic acid (PAA) activation by catalysts is complex, often generating unwanted radicals.
- Existing methods struggle to suppress radical generation during PAA activation.
Purpose of the Study:
- To develop a strategy for deterministic control of PAA activation pathways.
- To suppress radical generation and promote singlet oxygen (1O2) formation.
- To enhance the stability and efficiency of catalytic oxidation for water treatment.
Main Methods:
- Utilizing an interlayer confinement strategy with atomically dispersed cobalt sites stabilized in KOH-compressed montmorillonite (CoSAC-KMT).
- Constructing a confined microenvironment using a deck-effect within nano-galleries.
- Employing mechanistic and theoretical analyses to investigate PAA adsorption and activation.
Main Results:
- The CoSAC-KMT system fundamentally altered PAA-catalyst interactions, suppressing radical pathways.
- PAA activation was redirected to nearly exclusive singlet oxygen (1O2) generation.
- Reduced interlayer spacing reshaped PAA adsorption and energy landscape, facilitating 1O2 formation.
Conclusions:
- Interlayer confinement is an effective strategy for reprogramming PAA activation pathways toward singlet oxygen generation.
- The developed confinement strategy is transferable to other oxidants like peroxymonosulfate (PMS).
- The CoSAC-KMT/PAA system shows superior environmental robustness and long-term stability for water treatment.
Related Concept Videos
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.
02:24Acid-Catalyzed Ring-Opening of Epoxides
Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...
01:26Photochemical Electrocyclic Reactions: Stereochemistry
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
01:07Alkylation of β-Ketoester Enolates: Acetoacetic Ester Synthesis
Acetoacetic ester synthesis is a method to obtain ketones from alkyl halides and β-keto esters. The reaction occurs in the presence of an alkoxide base that abstracts the acidic proton of the β-keto esters. The step results in an enolate ion which is doubly stabilized. The enolate then reacts with an alkyl halide via the SN2 process to produce an alkylated ester intermediate with a new C–C bond. The hydrolysis of the intermediate, followed by acidification, results in an alkylated β-keto acid.
01:19α-Hydroxy Ketones via Reductive Coupling of Esters: Acyloin Condensation Overview
The pinacol and McMurry reactions involve the reductive coupling of ketones or aldehydes. Similarly, the bimolecular reductive coupling of two ester molecules in the presence of sodium metal in an aprotic solvent yields an α-hydroxy ketone product. The α-hydroxy ketone is also called acyloin, so the reaction is referred to as ‘acyloin condensation.’
01:29Leveling Effect
In acid-base chemistry, the leveling effect refers to the limitation imposed by the solvent on the strength of acids and bases in solution. When a base stronger than the solvent's conjugate base is used, it deprotonates the solvent until the base is entirely consumed, making it ineffective against weaker acids. Conversely, an acid stronger than the solvent's conjugate acid protonates the solvent until the acid is depleted, rendering it ineffective against weaker bases. Essentially, the solvent...