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 nano-particles 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 nanopar-ticles 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 character-istic,including the high-level bed expansion ratio,low minimum fluidization velocity(1.5 and 1.6 cm·s-1),high Richardson-Zaki n index(5.2 and 5.3＞5),and low Πvalue(83.2 and 84.8＜100,respectively).Chemical modi-fication of carbon nanotubes causes not only enhanced CO2 uptake capacity but also decreases the required amount of silica additive to reach a homogeneous fluidi-zation behavior for synthesized carbon nanotubes sorbent.

Mahsa Javidi Nobarzad;Maryam Tahmasebpoor;Mohammad Heidari;Covadonga Pevida

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

化学科学与工程前沿

[1]Mahsa Javidi Nobarzad;Maryam Tahmasebpoor;Mohammad Heidari;Covadonga Pevida-.Theoretical and experimental study on the fluidity performance of hard-to-fluidize carbon nanotubes-based CO2 capture sorbents)[J].化学科学与工程前沿,2022(10):1460-1475

fluidize,fluidizability,fluidizable,nanotubes+7,nanotubes+5,fluidi

Theoretical,experimental,study,fluidity,performance,carbon,capture,sorbents,Carbon,materials,have,been,identified,promising,efficient,fluidized,beds,suffering,from,insufficient,contact,level,capacity,This,focuses,promoting,pure,synthesized,silica,coated,amine,functionalized,novel,presents,superior,about,times,higher,than,during,consecutive,adsorption,regeneration,cycles,low,cost,SiO2,particles,are,used,assistant,improve,Results,reveal,that,minimum,amount,wt,nanopar,required,achieve,agglomerate,particulate,fluidization,behavior,respectively,Pure,indicates,character,istic,including,expansion,velocity,Richardson,Zaki,value,Chemical,modi,fication,causes,only,enhanced,uptake,but,also,decreases,additive,reach,homogeneous

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