title: Epoxide-functionalization of polyethyleneimine for synthesis of stable carbon dioxide adsorbent in temperature swing adsorption.
abstract: Amine-containing adsorbents have been extensively investigated for post-combustion carbon dioxide capture due to their ability to chemisorb low-concentration carbon dioxide from a wet flue gas. However, earlier studies have focused primarily on the carbon dioxide uptake of adsorbents, and have not demonstrated effective adsorbent regeneration and long-term stability under such conditions. Here, we report the versatile and scalable synthesis of a functionalized-polyethyleneimine (PEI)/silica adsorbent which simultaneously exhibits a large working capacity (2.2 mmol g(-1)) and long-term stability in a practical temperature swing adsorption process (regeneration under 100% carbon dioxide at 120 °C), enabling the separation of concentrated carbon dioxide. We demonstrate that the functionalization of PEI with 1,2-epoxybutane reduces the heat of adsorption and facilitates carbon dioxide desorption (>99%) during regeneration compared with unmodified PEI (76%). Moreover, the functionalization significantly improves long-term adsorbent stability over repeated temperature swing adsorption cycles due to the suppression of urea formation and oxidative amine degradation.
authors: Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea.
authors: Woosung
authors: W
authors: Choi
authors: Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea.
authors: Kyungmin
authors: K
authors: Min
authors: Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea.
authors: Chaehoon
authors: C
authors: Kim
authors: Department of Chemical Engineering, Kongju National University, Cheonan 331-717, Republic of Korea.
authors: Young Soo
authors: YS
authors: Ko
authors: Department of Chemical Engineering, Kongju National University, Cheonan 331-717, Republic of Korea.
authors: Jae Wan
authors: JW
authors: Jeon
authors: Center for Convergent Chemical Process, Korea Research Institute of Chemical Technology, Daejeon 305-600, Republic of Korea.
authors: Hwimin
authors: H
authors: Seo
authors: Center for Convergent Chemical Process, Korea Research Institute of Chemical Technology, Daejeon 305-600, Republic of Korea.
authors: Yong-Ki
authors: YK
authors: Park
authors: Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea.
authors: Minkee
authors: M
authors: Choi