Related Experiment Video
Updated: Sep 11, 2025
09:21
Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether
Published on: August 17, 2019
9.0K
Overcoming activity/stability tradeoffs in CO oxidation catalysis by Pt/CeO2
Benjamin Bohigues1, Sergio Rojas-Buzo2,3, Davide Salusso4
1Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Avenida de los Naranjos s/n, València, Spain.
Nature Communications
|August 12, 2025
Summary
Researchers developed a new catalyst by trapping platinum on cerium dioxide (CeO2) supports. This design overcomes the typical activity-stability tradeoff, offering high performance for CO oxidation catalysis.
Area of Science:
- Materials Science
- Catalysis
- Surface Chemistry
Background:
- Redox-active metal oxides supporting noble metals are crucial for CO oxidation catalysts in emissions control.
- Cerium dioxide (CeO2) supports enhance activity but cause deactivation via platinum oxidation, creating an activity-stability tradeoff.
Purpose of the Study:
- To develop a catalytic material that overcomes the activity-stability tradeoff in CO oxidation.
- To stabilize metallic platinum on CeO2 supports under reaction conditions.
Main Methods:
- Utilized X-ray Absorption Spectroscopy (XAS), CO-Diffuse Reflectance Infrared Fourier Transform Spectroscopy (CO-DRIFT), X-ray Photoelectron Spectroscopy (XPS), High-Angle Annular Dark-Field Scanning Transmission Electron Microscopy (HAADF-STEM), and Density Functional Theory (DFT) calculations.
- Investigated platinum (Pt) interaction with V-shaped pockets/stepped sites on CeO2.
Main Results:
- Successfully trapped Pt at specific V-shaped pockets/stepped sites on the CeO2 support.
- Demonstrated high activity and stability for CO oxidation, breaking the conventional tradeoff.
- Inferred that low-order metallic Pt clusters stabilized at these sites inhibit Pt re-oxidation.
Conclusions:
- The developed Pt/CeO2 catalyst operates outside the typical activity-stability limitations.
- Stabilizing Pt at specific crystallographic interfaces on CeO2 is key to achieving robust catalytic performance.
Related Concept Videos
02:50Catalysis
27.6K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
27.6K
02:13Reduction of Alkenes: Catalytic Hydrogenation
12.6K
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...
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...
12.6K
01:19Turnover Number and Catalytic Efficiency
10.7K
The turnover number of an enzyme is the maximum number of substrate molecules it can transform per unit time. Turnover numbers for most enzymes range from 1 to 1000 molecules per second. Catalase has the known highest turnover number, capable of converting up to 2.8×106 molecules of hydrogen peroxide into water and oxygen per second. Lysozyme has the lowest known turnover number of half a molecule per second.
Chymotrypsin is a pancreatic enzyme that breaks down proteins during digestion....
Chymotrypsin is a pancreatic enzyme that breaks down proteins during digestion....
10.7K
01:19Phase I Oxidative Reactions: Overview
376
Phase I biotransformation, or functionalization, is a crucial chemical process that converts drugs and other xenobiotics into more water-soluble forms, facilitating expulsion from the body. It involves oxidative, reductive, and hydrolytic reactions that add or unveil polar functional groups on lipophilic substrates. Key players in phase I reactions are the mixed-function oxidases. Situated in liver cell microsomes, these enzymes predominantly carry out drug metabolism. They require molecular...
376
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.4K
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...
3.4K
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
10.8K
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.
10.8K