Aminosilane‐Grafted Zirconia–Titiania–Silica Nanoparticles/Torlon Hollow Fiber Composites for CO 2 Capture

In this work, the development of novel binary and ternary oxide/Torlon hollow fiber composites comprising zirconia, titania, and silica as amine supports was demonstrated. The resulting binary (Zr‐Si/PAI–HF, Ti‐Si/PAI–HF) and ternary (Zr‐Ti‐Si/PAI–HF) composites were then functionalized with monoamine‐, diamine‐, and triamine‐substituted trialkoxysilanes and were evaluated in CO 2 capture. Although the introduction of both Zr and Ti improved the CO 2 adsorption capacity relative to that with Si/PAI–HF sorbents, zirconia was found to have a more favorable effect on the CO 2 adsorption performance than titania, as previously demonstrated for amine sorbents in the powder form. The Zr‐Ti‐Si/PAI–HF sample with an oxide content of 20 wt % was found to exhibit a relatively high CO 2 capacity, that is, 1.90 mmol g −1 at atmospheric pressure under dry conditions, owing to more favorable synergy between the metal oxides and CO 2 . The ternary fiber sorbent showed improved sorption kinetics and long‐term stability in cyclic adsorption/desorption runs.