Comparative Study of Molecular Basket Sorbents Consisting of Polyallylamine and Polyethylenimine Functionalized SBA‐15 for CO 2 Capture from Flue Gas

Wang, Dongxiang; Wang, Xiaoxing; Song, Chunshan

doi:10.1002/cphc.201700828

Title: Comparative Study of Molecular Basket Sorbents Consisting of Polyallylamine and Polyethylenimine Functionalized SBA‐15 for CO ₂ Capture from Flue Gas

Journal Article · Thu Oct 19 00:00:00 EDT 2017 · ChemPhysChem

DOI:https://doi.org/10.1002/cphc.201700828· OSTI ID:1400327

Wang, Dongxiang ^[1];

^[1];

^[2]

Clean Fuels and Catalysis Program EMS Energy Institute PSU-DUT Joint Center for Energy Research Department of Energy &, Mineral Engineering Pennsylvania State University 209 Academic Projects Building University Park PA 16802 USA
Clean Fuels and Catalysis Program EMS Energy Institute PSU-DUT Joint Center for Energy Research Department of Energy &, Mineral Engineering Pennsylvania State University 209 Academic Projects Building University Park PA 16802 USA, Department of Chemical Engineering Pennsylvania State University 209 Academic Projects Building University Park PA 16802 USA

Abstract Polyallylamine (PAA)‐based molecular basket sorbents (MBS) have been studied for CO ₂ capture in comparison with polyethylenimine (PEI)‐based MBS. The characterizations including N ₂ physisorption, diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and thermogravimetric analysis (TGA) showed that PAA ( M _n =15 000) is more rigid and has more steric hindrance inside SBA‐15 pores than PEI owing mainly to its different polymer structure. The effects of temperature and PAA loading on the CO ₂ sorption capacity of PAA‐based MBS have been examined by TGA by using 100 % CO ₂ gas stream and compared with PEI/SBA‐15. It was found that the capacity of the PAA/SBA‐15 sorbent increased with increasing temperature. The optimum capacity of 88 mg _CO2 g _sorb ⁻¹ was obtained at 140 °C for PAA(50)/SBA‐15 whereas the optimum sorption temperature was 75 and 90 °C for PEI‐I(50)/SBA‐15 (PEI‐I, M _n =423) and PEI‐II(50)/SBA‐15 (PEI‐II, M _n =25 000), respectively. The capacity initially increased with the increase of PAA loading and then dropped at high amine contents, owing to the increased diffusion barrier. The highest CO ₂ capacity of 109 mg _CO2 g _sorb ⁻¹ was obtained at a PAA loading of 65 wt %, whereas the PAA(50)/SBA‐15 sorbent gave the best amine efficiency of 0.23 mol _CO2 mol _N ⁻¹ . The effect of moisture was examined in a fixed‐bed flow system with simulated flue gas containing 15 % CO ₂ and 4.5 % O ₂ in N ₂ . It was found that the presence of moisture significantly enhanced CO ₂ sorption over PAA(50)/SBA‐15 and greatly improved its cyclic stability and regenerability. Compared with PEI/SBA‐15, PAA/SBA‐15 possesses a better thermal stability and higher resistance to oxidative degradation. However, the CO ₂ sorption rate over the PAA(50)/SBA‐15 sorbent was much slower.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: FE0000458

OSTI ID:: 1400327

Journal Information:: ChemPhysChem, Journal Name: ChemPhysChem Vol. 18 Journal Issue: 22; ISSN 1439-4235

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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Title: Comparative Study of Molecular Basket Sorbents Consisting of Polyallylamine and Polyethylenimine Functionalized SBA‐15 for CO ₂ Capture from Flue Gas