Emergent integration of the amine scrubbing method into photocatalytic CO₂ reduction.
- 1Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University 1-3-1 Kagamiyama, Higashi-Hiroshima Hiroshima 739-8526 Japan [email protected].
- 2Department of Chemistry, School of Science, Institute of Science Tokyo (Tokyo Institute of Technology) 2-12-1, O-okayama Meguro-ku Tokyo 152-8550 Japan.
Abstract
Developing strategies for photocatalytic reduction of low-concentration CO₂ under ambient conditions is essential for mitigating global warming and addressing energy and carbon resource shortages. The amine scrubbing method (ASM), which captures dilute CO₂ as carbamic acid using low-cost primary and secondary amines, is widely employed to generate concentrated CO₂. However, releasing CO₂ from carbamic acid to generate highly concentrated CO₂ requires high-temperature heating, resulting in substantial energy consumption and cost. Herein, we report the integration of ASM with photocatalytic CO₂ reduction. A newly synthesized complex [Ru(bpy)(P-P)(CO)(H)]⁺ (Ru-H⁺; bpy = 2,2'-bipyridine, P-P = Ph₂PC₂H₄PPh₂) serves as an efficient catalyst for reducing CO₂ at low concentrations, even below 0.34%, in the presence of an Ir-based photosensitizer and a reductant (TONHCOOH ≥ 1925, Φ HCOOH = 39%, selectivityHCOOH > 97%). This system quantitatively converts CO₂ captured by amines such as monoethanolamine into formic acid at room temperature. In this process, CO₂ released from carbamic acid in solution is rapidly consumed via photocatalytic reduction, enabling efficient utilization of low-concentration CO₂ without requiring energy-intensive regeneration processes.
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BibTeX
@article{hosokawa2026emergent,
title = {{Emergent integration of the amine scrubbing method into photocatalytic CO₂ reduction.}},
author = {Naoki Hosokawa and Shunya Uno and Hiroharu Watanabe and Osamu Ishitani},
journal = {Chemical science},
year = {2026},
month = oct,
doi = {10.1039/d6sc05488a},
url = {https://europepmc.org/article/MED/42877607},
note = {CC BY-NC},
}
RIS
TY - JOUR
TI - Emergent integration of the amine scrubbing method into photocatalytic CO₂ reduction.
AU - Naoki Hosokawa
AU - Shunya Uno
AU - Hiroharu Watanabe
AU - Osamu Ishitani
PY - 2026
DA - 2026/10/08
JO - Chemical science
DO - 10.1039/d6sc05488a
UR - https://europepmc.org/article/MED/42877607
AB - Developing strategies for photocatalytic reduction of low-concentration CO₂ under ambient conditions is essential for mitigating global warming and addressing energy and carbon resource shortages. The amine scrubbing method (ASM), which captures dilute CO₂ as carbamic acid using low-cost primary and secondary amines, is widely employed to generate concentrated CO₂. However, releasing CO₂ from carbamic acid to generate highly concentrated CO₂ requires high-temperature heating, resulting in substantial energy consumption and cost. Herein, we report the integration of ASM with photocatalytic CO₂ reduction. A newly synthesized complex [Ru(bpy)(P-P)(CO)(H)]⁺ (Ru-H⁺; bpy = 2,2'-bipyridine, P-P = Ph₂PC₂H₄PPh₂) serves as an efficient catalyst for reducing CO₂ at low concentrations, even below 0.34%, in the presence of an Ir-based photosensitizer and a reductant (TONHCOOH ≥ 1925, Φ HCOOH = 39%, selectivityHCOOH > 97%). This system quantitatively converts CO₂ captured by amines such as monoethanolamine into formic acid at room temperature. In this process, CO₂ released from carbamic acid in solution is rapidly consumed via photocatalytic reduction, enabling efficient utilization of low-concentration CO₂ without requiring energy-intensive regeneration processes.
SN - 2041-6520
SN - 2041-6539
ER -