A novel internal assistance method for enhanced fluidization of nanoparticles

Noupoor, Yaghoub Rahimvandi; Tahmasebpoor, Maryam

doi:10.1007/s11814-019-0318-7

Cited by 10 publications

(4 citation statements)

References 37 publications

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“…3.4 Fluidizability of binary mixtures of pure CNT or MEA-Si-CNT + SiO 2 NPs Amjadi et al [25] indicated that adding easy-fluidizable NPs to the nano-scale powders decreases inter-particle cohesive forces and inhibits the development of large compact aggregates during fluidity leading to more homogenous fluidization. To improve the fluidity of hardto-fluidize pure CNT and MEA-Si-CNT, these sorbents were mixed with differential weigh percentages of SiO 2 NPs.…”

Section: Characterizations Of Pure Cnt and Mea-si-cntmentioning

confidence: 99%

“…2(c), are distributed between the CNTs. It can be inferred that strong electrostatic forces of attraction developed at the contact points between the SiO 2 NPs and CNT particles due to contact charging [19,20,23,25,26]. The easy-fluidizable SiO 2 NPs become carriers of the CNT particles, which improves the fluidity behavior.…”

Section: Fluidizability Of Pure Cnt + Sio 2 Npsmentioning

confidence: 99%

“…The NPs with better fluidization behavior, such as hydrophobic silica, are the most common auxiliary additives to enhance the fluidization ability of hard-to-fluidized NPs [20]. By adding the optimized amounts of the mentioned assistant materials, U mf will decrease while the bed expansion increases [19,20,23,[25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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

Nobarzad

Tahmasebpoor

Heidari

et al. 2022

Front. Chem. Sci. Eng.

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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 cms−1), high Richardson—Zaki n 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 CO2 uptake capacity but also decreases the required amount of silica additive to reach a homogeneous fluidization behavior for synthesized carbon nanotubes sorbent.

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Section: Characterizations Of Pure Cnt and Mea-si-cntmentioning

confidence: 99%

Section: Fluidizability Of Pure Cnt + Sio 2 Npsmentioning

confidence: 99%

See 1 more Smart Citation

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

Nobarzad

Tahmasebpoor

Heidari

et al. 2022

Front. Chem. Sci. Eng.

Self Cite

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show abstract

“…However, the fluidization of CaO adsorbents (in fine and pellet scales) in fluidized bed reactor under realistic conditions has not been comprehensively investigated yet. Previous studies have reported the heterogeneous fluidity quality of fine CaO particles in fluidized bed due to the nature of CaO, a subset of Geldart C group materials [92][93][94], even though several internal methods have been proposed to improve CaO-based particle fluidity at lab-scale experiments [48,49,95,96]. It is north worthy that, in addition to promising cyclic activity and morphological properties, the complete fluidization of CaO adsorbents is required to employ the CaL process in practical and industrial applications.…”

Section: Outlooks Of Cao Adsorbents At Cal Processmentioning

confidence: 99%