Design of Ultra-Stable Solid Amine Adsorbents and Mechanisms of Hydroxyl Group-Dependent Deactivation for Reversible CO₂ Capture from Flue Gas.

ABSTRACT: Although supported solid amine adsorbents have attracted great attention for CO₂ capture, critical chemical deactivation problems including oxidative degradation and urea formation have severely restricted their practical applications for flue gas CO₂ capture. In this work, we reveal that the nature of surface hydroxyl groups (metal hydroxyl Al-OH and nonmetal hydroxyl Si-OH) plays a key role in the deactivation mechanisms. The polyethyleneimine (PEI) supported on Al-OH-containing substrates suffers from severe oxidative degradation during the CO₂ capture step due to the breakage of amine-support hydrogen bonding networks, but exhibits an excellent anti-urea formation feature by preventing dehydration of carbamate products under a pure CO₂ regene

SUBMITTER: Zhao M 

PROVIDER: S-EPMC11871205 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature