Surfactant promoted solid amine sorbents for CO₂capture

Abstract

A new strategy to improve the CO 2 capture performance of solid amine sorbents has been developed based on the balance of CO 2 kinetic diffusion and thermodynamic sorption. The CO 2 -neutral surfactant was introduced into polyethyleneimine (PEI) to create extra CO 2 transfer pathways, facilitating CO 2 diffusion into the deeper PEI films. Consequently, the sorbents offered increased amount of reactive sites and higher utilization efficiency of amine groups, leading to a dramatically enhanced CO 2 dynamic capacity and total capacity. Due to the facilitating diffusion, the sorbents could work at room temperature with very good performance. At 30 C the surfactant-promoted sorbents had the CO 2 capture capacity as high as 142 mg g À1 and their amine utilization was over 50%, which are the highest values ever reported for the PEI loaded sorbents working at this temperature. The surfactant-promoted sorbents also exhibited much better sorption kinetics and regeneration performance. In addition to advancing the support or amine, the present study provides another costefficient and general approach to design high performance CO 2 solid sorbents and may have a major impact on the advance of current carbon capture and storage technologies.

Application of polyethylenimine‐impregnated solid adsorbents for direct capture of low‐concentration CO2

“…To further advance the adsorbents for low-concentration CO 2 capture, we use a facilitating CO 2 diffusion strategy raised in our previous contributions. 61 Three polymer surfactants (Span80, CTAB, and PEG) were added to the PEI at a fixed HP2MGL/PEI/surfactant weight ratio of 45/50/5. The adsorption capacities of the surfactant-promoted adsorbents exposed to 400 and 5000 ppm CO 2 /N 2 gas mixtures at 25 C are shown in Figure 7.…”

Microwave pyrolysis of rice straw to produce biochar as an adsorbent for CO2 capture

“…The regeneration performance of CO 2 adsorbents is an important parameter, as the adsorbents should retain stable CO 2 adsorption performance for long-term cyclic operation [55]. In this study, the CO 2 adsorption capacity slightly decreased when the adsorptionedesorption process of the biochar was continuously repeated, as shown in Fig.…”

Carbon dioxide adsorption using amine-functionalized mesocellular siliceous foams

“…Wang et al [52] concluded that TEPA was better distributed with the help of the template [alcohol polyoxyethylene ether (A (EO) 9)]. Ling and coauthors [60] utilized nine surfactants as promoters to facilitate the CO 2 diffusion from the surface into the bulk of PEI. As a result, nonionic surfactant sorbitan monooleate (Span80) was found to be an optimal candidate to promote CO 2 diffusion process.…”