A Pelletizing Method for the Mass Synthesis of Functionalized-Polyethylenimine-Based Adsorbents for Carbon Dioxide Capture in Continuous Exhaust Gas Flow Conditions

YOUNGHUN KIM, Inyong Park, Dae Hoon Park, Gunhee Lee, Jungho Hwang, Bangwoo Han, Korea Institute of Machinery & Materials, Yonsei University

     Abstract Number: 661
     Working Group: Nanoparticles and Materials Synthesis

Abstract
Polyethylenimine-based adsorbents have been actively investigated for carbon dioxide capture emitted post-combustion. Most of the previous studies on polyethylenimine-based adsorbents have focused on the powder or particle form. Powder or particle adsorbents applied to exhaust gas aftertreatment of facilities or mobilities can cause adsorbent loss due to exhaust gas flow. In this study, we report the pelletization by extrusion of a functionalized-polyethylenimine (PEI)/silica adsorbents for application in exhaust gas aftertreatment. The pellet-type substrates were extruded using a silica-based material, and an organic binder was added to maintain a pellet shape. After extrusion, the organic binder was calcined at about 150-750 ℃. The pellet-type substrates calcined at about 550 ℃ had the highest total pore volume (0.98 cm³/g). The calcined pellet-type substrates were impregnated with functionalized-PEI. To demonstrate the carbon dioxide adsorption efficiency of the functionalized PEI/silica adsorbents according to the calcination temperature, we measured the carbon dioxide concentration at the downstream of the adsorbents for about 5 min in approximately 5% carbon dioxide continuous gas flow conditions (50 L/min). The average carbon dioxide adsorption efficiency for 5 min of the adsorbents was also the highest at 550 °C calcination conditions (22.64%). In addition, the functionalized PEI/silica adsorbents calcined at 550 °C were saturated upon carbon dioxide adsorption for about 90 min (1.05 mmol/g).

This research was supported by Korea Institute of Marine Science & Technology Promotion(KIMST) funded by the Ministry of Oceans and Fisheries (20220568).