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Heterogeneous Catalysis

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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...

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Updated: Apr 18, 2026

CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light

CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light

Published on: June 12, 2019

Efficient Photocatalysts for CO2 Reduction.

Go Sahara¹, Osamu Ishitani^1,2

¹†Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1-NE-1, Ookayama, Meguro-ku, Tokyo 152-8550, Japan.

Inorganic Chemistry

|January 29, 2015

Summary

This summary is machine-generated.

Researchers reviewed three rhenium(I)-based photocatalytic systems for carbon dioxide (CO2) reduction. The most efficient system achieved a quantum yield of 0.82, demonstrating significant advancements in CO2 conversion technology.

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Area of Science:

Photocatalysis
Green Chemistry
Materials Science

Background:

Developing efficient photocatalytic systems for carbon dioxide (CO2) reduction is crucial for addressing climate change.
Rhenium(I) complexes have shown promise as components in artificial photosynthesis.
Existing systems often face limitations in efficiency, durability, or scope.

Purpose of the Study:

To review and highlight three novel photocatalytic systems for CO2 reduction developed by the research group.
To showcase advancements in system design, from two-component to supramolecular and artificial Z-scheme architectures.
To present performance metrics including quantum yields, turnover numbers, and turnover frequencies.

Main Methods:

Design and synthesis of rhenium(I)-based photocatalytic systems.
Characterization of two-component systems with distinct photosensitizer and catalyst roles.
Development of supramolecular photocatalysts integrating multiple functional units.
Construction of artificial Z-scheme photocatalysts utilizing semiconductor and supramolecular components.
Evaluation of photocatalytic performance under specific excitation wavelengths (e.g., λex = 436 nm).

Main Results:

A mixed system of a ring-shaped rhenium(I) trinuclear complex and fac-[Re(bpy)(CO)3(MeCN)](+) achieved the highest photocatalytic efficiency for CO2 reduction (ΦCO = 0.82 at λex = 436 nm).
Supramolecular photocatalysts demonstrated superior durability and speed, with ΦCO = 0.45, TONCO = 3029, and TOFCO = 35.7 min⁻¹.
A novel artificial Z-scheme photocatalyst, activated by stepwise excitation, exhibited strong oxidation and reduction capabilities.

Conclusions:

The reviewed rhenium(I)-based systems represent significant progress in photocatalytic CO2 reduction.
Supramolecular and artificial Z-scheme designs offer promising avenues for enhanced efficiency, stability, and broader applicability.
These advancements contribute to the development of sustainable technologies for carbon utilization.