Theoretical and experimental study on the fluidity performance of hard-to-fluidize carbon nanotubes-based CO<sub>2</sub> capture sorbents

doi:10.1007/s11705-022-2159-x

Front. Chem. Sci. Eng.

2022, Vol. 16

Issue (10) : 1460-1475 https://doi.org/10.1007/s11705-022-2159-x

RESEARCH ARTICLE

Theoretical and experimental study on the fluidity performance of hard-to-fluidize carbon nanotubes-based CO₂ capture sorbents

Mahsa Javidi Nobarzad¹, Maryam Tahmasebpoor¹(

), Mohammad Heidari¹, Covadonga Pevida²(

)

¹. Faculty of Chemical & Petroleum Engineering, University of Tabriz, Tabriz 51666-16471, Iran
². Instituto de Ciencia y Tecnología del Carbono, INCAR-CSIC, Oviedo 33011, Spain

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Abstract

Carbon nanotubes-based materials have been identified as promising sorbents for efficient CO₂ capture in fluidized beds, suffering from insufficient contact with CO₂ for the high-level CO₂ capture capacity. This study focuses on promoting the fluidizability of hard-to-fluidize pure and synthesized silica-coated amine-functionalized carbon nanotubes. The novel synthesized sorbent presents a superior sorption capacity of about 25 times higher than pure carbon nanotubes during 5 consecutive adsorption/regeneration cycles. The low-cost fluidizable-SiO₂ nanoparticles are used as assistant material to improve the fluidity of carbon nanotubes-based sorbents. Results reveal that a minimum amount of 7.5 and 5 wt% SiO₂ nanoparticles are required to achieve an agglomerate particulate fluidization behavior for pure and synthesized carbon nanotubes, respectively. Pure carbon nanotubes + 7.5 wt% SiO₂ and synthesized carbon nanotubes + 5 wt% SiO₂ indicates an agglomerate particulate fluidization characteristic, including the high-level bed expansion ratio, low minimum fluidization velocity (1.5 and 1.6 cm·s^–1), high Richardson−Zakin index (5.2 and 5.3 > 5), and low Π value (83.2 and 84.8 < 100, respectively). Chemical modification of carbon nanotubes causes not only enhanced CO ₂ uptake capacity but also decreases the required amount of silica additive to reach a homogeneous fluidization behavior for synthesized carbon nanotubes sorbent.

Keywords CO₂ capture CNT-based sorbents fluidization SiO₂ nanoparticles fluidized bed reactors

Corresponding Author(s): Maryam Tahmasebpoor,Covadonga Pevida

About author:

Tongcan Cui and Yizhe Hou contributed equally to this work.

Online First Date: 23 May 2022 Issue Date: 17 October 2022

Cite this article:

Mahsa Javidi Nobarzad,Maryam Tahmasebpoor,Mohammad Heidari, et al. Theoretical and experimental study on the fluidity performance of hard-to-fluidize carbon nanotubes-based CO₂ capture sorbents[J]. Front. Chem. Sci. Eng., 2022, 16(10): 1460-1475.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-022-2159-x
https://academic.hep.com.cn/fcse/EN/Y2022/V16/I10/1460

Fig.1 FTIR spectra of pure CNT and MEA-Si-CNT.

Fig.2 SEM micrographs of (a) pure CNT, (b) MEA-Si-CNT, (c) pure CNT + 10 wt% SiO₂ NPs, and (d) MEA-Si-CNT + 7.5 wt% SiO₂ NPs.

Tab.1 CO₂ sorption capacity of pure CNT and MEA-Si-CNT during 5 consecutive adsorption/regeneration cycles ^a)

Fig.3 (a) Bed expansion and measured pressure drop curves for pure CNT; (b) plot of log U_g against log ε_b according to the linear form of the R–Z’s equation for pure CNT.

Sorbent	SiO₂ NPs/(wt%)	$ρ a$ /(kg·m^–3)	H_mf/cm	U_mf/(cm·s^–1)	n Index	Π	Fluidity behavior
Pure CNT +	0	102.35	4.5	2.5	2.5	1388	ABF
	2.5	80.7	4.2	2.1	2.8	475	ABF
	5	69.4	4.2	1.9	3.8	259	ABF
	7.5	57.5	4	1.5	5.2	83.2	APF
	10	46.8	3.9	1.3	6.5	35.7	APF

Tab.2 Fluidity characteristics of pure CNT and binary mixtures of pure CNT + SiO₂ NPs

Fig.4 (a) Bed expansion curves for binary mixtures of pure CNT + SiO₂ NPs and measured pressure drop curves for pure CNT + SiO₂ NPs with silica weight percentages of (b) 2.5 wt%, (c) 5 wt%, (d) 7.5 wt% and (e) 10 wt%.

Fig.5 Bed expansion setup pictures for binary mixtures of pure CNT + SiO₂ NPs fluidized in dry N₂ at a gas velocity of ~3.5 cm·s^–1.

Fig.6 Plot of log U_g against log ε_b for pure CNT + (a) 2.5 wt%, (b) 5 wt%, (c) 7.5 wt% and (d) 10 wt% SiO₂ NPs.

Fig.7 (a) Bed expansion curves for binary mixtures of MEA-Si-CNT + SiO₂ NPs and measured pressure drop curves for mixtures of MEA-Si-CNT+ SiO₂ NPs with silica weight percentages of (b) 2.5 wt%, (c) 5 wt%, and (d) 7.5 wt%.

Fig.8 Bed expansion pictures of mixtures of MEA-Si-CNT + disparate weight percentages of SiO₂ NPs fluidized in dry N₂ at a gas velocity of ~3.5 cm·s^–1.

Sorbent	SiO₂ NPs/(wt%)	$ρ a$ /(kg·m^–3)	H_mf/cm	U_mf/(cm·s^–1)	n index	Π	Fluidity behavior
MEA-Si-CNT +	2.5	64.7	4.4	3.3	1.04	1237	ABF
	5	52.1	4.1	1.6	5.3	84.8	APF
	7.5	41.5	4	1.2	7.72	22	APF

Tab.3 Fluidity characteristics of binary mixtures of MEA-Si-CNT + SiO₂ NPs

Fig.9 Plot of log U_g against log ε_b for MEA-Si-CNT + (a) 2.5 wt%, (b) 5 wt% and (c) 7.5 wt% SiO₂ NPs.

Fig.10 Bed expansion curves for binary mixtures of pure CNT + 7.5 and 10 wt% SiO₂ and MEA-Si-CNT + 7.5 wt% SiO₂.

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