Related Experiment Video
Updated: Jul 1, 2025
07:08
CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light
Published on: June 12, 2019
6.8K
Enhancing Efficiency and High-Value Chemicals Generation through Coupling Photocatalytic CO2 Reduction with Propane
Zitao Duan1, Ruiqi Lv1, Zongyi Huang1
1Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, P. R. China.
Chemsuschem
|March 11, 2024
Summary
Replacing water oxidation with propane oxidation significantly boosts solar-driven carbon dioxide (CO2) reduction. This novel approach enhances CO2 conversion efficiency and produces valuable propylene, offering a pathway to carbon neutrality.
Area of Science:
- Photocatalysis
- Green Chemistry
- Materials Science
Background:
- Solar-driven carbon dioxide (CO2) conversion is crucial for carbon neutrality.
- Water oxidation in photocatalytic CO2 reduction is kinetically challenging due to complex electron and proton transfer.
- Efficient O-O bond formation in water oxidation remains a significant hurdle.
Purpose of the Study:
- To investigate the coupling of photocatalytic CO2 reduction with selective propane oxidation.
- To enhance CO2 reduction efficiency by replacing the unfavorable water oxidation step.
- To explore the mechanistic insights of this coupled reaction system.
Main Methods:
- Utilized a Pd/P25 (1 wt%) catalyst for the coupled reaction.
- Compared the efficiency of CO2 reduction with and without propane oxidation.
- Analyzed reaction intermediates, including hydroxyl radicals and carboxylate species.
Main Results:
- Achieved a nearly fivefold increase in CO2 reduction efficiency by coupling with propane oxidation.
- Propane oxidation proved more facile than water oxidation, enhancing photogenerated electron density.
- Identified hydroxyl radicals and carboxylate species as key intermediates in the reaction mechanism.
Conclusions:
- Coupling photocatalytic CO2 reduction with selective propane oxidation is a viable strategy for efficient CO2 utilization.
- This approach yields valuable propylene as a co-product.
- The study provides a deeper mechanistic understanding of coupled photocatalytic reactions.
Keywords:
carbon dioxide reductioncoupling reactionphotocatalysispropane selective oxidationtitanium dioxideMore Related Videos
Related Concept Videos
01:28Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation
4.5K
Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
4.5K
02:50Catalysis
26.9K
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.
26.9K
02:13Reduction of Alkenes: Catalytic Hydrogenation
12.0K
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...
12.0K
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.3K
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...
3.3K
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
7.7K
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.
7.7K
01:12Cycloaddition Reactions: MO Requirements for Photochemical Activation
2.1K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.1K