A scalable solid-state nanoporous network with atomic-level interaction design for carbon dioxide capture

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Carbon capture and sequestration (CCS) is vital for achieving carbon neutrality targets by reducing CO2 emissions.
• Developing cost-effective and efficient materials for CO2 capture remains a significant challenge in industrial applications.

Purpose of the Study:

• To demonstrate novel, sustainable, solid-state polyamine-appended melamine nanoporous networks (MNNs) for effective and high-capacity carbon dioxide capture.
• To elucidate the reaction mechanisms of MNNs with CO2 at the atomic level using advanced spectroscopic techniques.

Main Methods:

• Synthesis of polyamine-appended, cyanuric acid-stabilized melamine nanoporous networks (MNNs) using dynamic combinatorial chemistry (DCC) at the kilogram scale.
• Utilizing double-level DCC and two-dimensional heteronuclear chemical shift correlation nuclear magnetic resonance (2D-HCNMR) spectroscopy to study CO2 chemisorption mechanisms.
• Evaluating MNNs' adsorption capacity, kinetics, stability, and cost-effectiveness.

Main Results:

• Identified ammonium carbamate pairs and a mixture of ammonium carbamate and carbamic acid during CO2 chemisorption.
• Achieved high CO2 adsorption capacity (1.82 mmol/g at 1 bar) with rapid adsorption kinetics (less than 1 minute).
• Demonstrated extraordinary cycling stability when exposed to flue gas, alongside a low material price.

Conclusions:

• The polyamine and cyanuric acid modification of MNNs significantly enhances CO2 capture performance.
• The study presents a generalizable industrialization method for CO2 capture through DCC-based atomic-level design.
• These MNNs represent a promising advancement in sustainable materials for effective carbon dioxide emission reduction.