Novel PEI@CSH adsorbents derived from coal fly ash enabling efficient and in-situ CO2 capture: The anti-urea mechanism of CSH support

Qu，Fan1; Yan，Feng1,2; Shen，Xuehua1; Li，Chunyan1; Chen，Heijin1; Wang，Pengju1; Zhang，Zuotai1,2

2022-12-10

10.1016/j.jclepro.2022.134420

Journal of Cleaner Production   Impact Factor & Quartile

0959-6526

1879-1786

Solid amine adsorption is considered to be the most promising technology for post-combustion CO capture, but it still has drawbacks due to the high cost of supports and the easy occurrence of CO-induced chemical deactivation. Herein, we propose a novel eco-friendly method for realizing efficient and stable solid amine adsorbents. A calcium silicate hydrate (CSH) support with a pore volume of 3.0 cm g is synthesized from coal fly ash (CFA) with the pore-expanded assistance of azeotropic distillation, and then the PEI@CSH adsorbents are prepared by impregnation. The adsorption capacity of the prepared 60%PEI@CSH-0.1 adsorbent reaches 198 mg g and exhibits an excellent cyclic stability, with an attenuation of only 1.9% after 10 cycles under ideal regeneration conditions. Even under realistic regeneration conditions, the CO uptake remains at 103 mg g after 10 cycles, which shows obvious advantages over that of commercial SiO supports. By using FT-IR, solid-state NMR and DFT calculations, we found that the CSH support promotes the conversion of primary amines to secondary amines in PEI molecules, and thus effectively inhibits the inactivation induced by the formation of urea compounds. Therefore, the PEI@CSH adsorbents provide a low-cost and high-efficiency approach for both in-situ CFA utilization and CO mitigation inside coal-fired power plants.

Anti-urea property Azeotropic distillation CO2 adsorption performance Coal fly ash Pore-expanded CSH Solid amine adsorbent

SCI

English

First ; Corresponding

Basic and Applied Basic Research Foundation of Guangdong Province[2021A1515010148];National Natural Science Foundation of China[22008104];National Natural Science Foundation of China[52225407];Shenzhen Graduate School, Peking University[JCYJ20200109141642225];Shenzhen Graduate School, Peking University[JSGG20210713091810035];Shenzhen Graduate School, Peking University[RCBS20210609104422047];

Science & Technology - Other Topics ; Engineering ; Environmental Sciences & Ecology

Green & Sustainable Science & Technology ; Engineering, Environmental ; Environmental Sciences

WOS:000874806400005

ELSEVIER SCI LTD

2-s2.0-85140136996

Scopus

1.School of Environmental Science and Engineering,Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control,Southern University of Science and Technology,Shenzhen,518055,China
2.Key Laboratory of Municipal Solid Waste Recycling Technology and Management of Shenzhen City,Shenzhen,518055,China

Qu，Fan,Yan，Feng,Shen，Xuehua,et al. Novel PEI@CSH adsorbents derived from coal fly ash enabling efficient and in-situ CO2 capture: The anti-urea mechanism of CSH support[J]. Journal of Cleaner Production,2022,378.

Qu，Fan.,Yan，Feng.,Shen，Xuehua.,Li，Chunyan.,Chen，Heijin.,...&Zhang，Zuotai.(2022).Novel PEI@CSH adsorbents derived from coal fly ash enabling efficient and in-situ CO2 capture: The anti-urea mechanism of CSH support.Journal of Cleaner Production,378.

Qu，Fan,et al."Novel PEI@CSH adsorbents derived from coal fly ash enabling efficient and in-situ CO2 capture: The anti-urea mechanism of CSH support".Journal of Cleaner Production 378(2022).