Issue 5, 2024

Efficient and stable CO2 capture using a scalable and spontaneous cross-linking amine-functionalized nano-Al2O3 adsorbent

Abstract

Overcoming the challenges of efficiency and stability in amine-functionalized adsorbents for post-combustion CO2 capture is a pivotal goal. In this context, we propose a facile synthesis route for the polyethyleneimine (PEI)-functionalized nano-Al2O3 (PEI@Al2O3) adsorbent at a 1-ton scale, ensuring remarkable CO2 capture performance. By employing nano-Al2O3 as a support, we facilitate substantial PEI loading and induce spontaneous cross-linking of amine groups via Lewis acid sites, achieved through an innovative combination of aging and alcohol washing techniques. The cross-linking in PEI@Al2O3 effectively promotes the electron transfer from amine groups to the surface of nano-Al2O3, preventing the dehydration reaction of primary amines with CO2 to form isocyanate, thereby obtaining anti-urea properties for PEI@Al2O3. The resulting PEI@Al2O3 adsorbent exhibits excellent overall performance, including high CO2 uptake (195 mg g−1), fast adsorption kinetics (reaching near saturation within 10 min), consistently stable anti-urea cycling performance (with a mere 0.14% deactivation per cycle), environmentally friendly and scalable production (eliminating the need for expensive reagents), and competitive cumulative CO2 capacity (8.05 t t−1 over 50 cycles). This breakthrough marks the advent of a new era for the advancement and practical utilization of cutting-edge amine-functionalized adsorbents.

Graphical abstract: Efficient and stable CO2 capture using a scalable and spontaneous cross-linking amine-functionalized nano-Al2O3 adsorbent

Supplementary files

Article information

Article type
Paper
Submitted
23 Oct 2023
Accepted
11 Dec 2023
First published
12 Dec 2023

J. Mater. Chem. A, 2024,12, 2697-2707

Efficient and stable CO2 capture using a scalable and spontaneous cross-linking amine-functionalized nano-Al2O3 adsorbent

X. Shen, F. Yan, Z. Zeng, P. Wang, F. Xie, X. Sun, H. Chen and Z. Zhang, J. Mater. Chem. A, 2024, 12, 2697 DOI: 10.1039/D3TA06456E

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements