Capture of Low-concentration Carbon Dioxide with Ultrafast-synthesized MOR-type Zeolites as Adsorbents

Developing CO2 capture and storage techniques is essential to combat climate-related CO2 issues and achieve carbon neutrality. In addition to addressing high-concentration CO2 scenarios, it's crucial to capture low-concentration CO2 from the air. Zeolites, crystalline aluminosilicates with ordered microporous structures, offer advantages such as fast kinetics, low adsorption heat, and long lifespan compared to liquid-phase amine-based sorbents. Efficient zeolite synthesis should be achieved for industrial application. In this study, we prepared an MOR-type zeolite within 40 minutes using an ultrafast method, compared to traditional hydrothermal synthesis taking days to weeks. This ultrafast-synthesized zeolite showed a high CO2 adsorption capacity of 1.05 mmol g−1 at 25 °C and 400 ppm, among the highest in the records by zeolites. It also demonstrated stability over five adsorption-desorption cycles. We further utilized in situ DRIFT to study the CO2 adsorption on this ultrafast-synthesized MOR-type zeolite. Results successfully demonstrate that the as-fabricated zeolite is a promising adsorbent for the direct air capture of CO2.