Simulation of synthesizing carbon nanotubes by catalytic chemical vapor deposition in a fluidized bed using a CFD-PBM model

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-03-14 DOI:10.1016/j.powtec.2025.120927

Mengting Liu , Mengdie Wang , Kefei Zhang , Hesheng Yu

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引用次数: 0

Abstract

Catalytic chemical vapor deposition (CCVD) within a fluidized bed reactor (FBR) is a cost-effective method to achieve continuous and large-scale production of high-quality carbon nanotubes (CNTs). This paper presents a computational fluid dynamics-population balance model (CFD-PBM) coupling model to simulate the production of CNTs by CCVD of ethylene in a bubbling FBR. First, the kinetics of ethylene catalytic cracking and size-dependent particle growth rate equation are proposed to simulate the CNTs growth for the initial 10 min. The CFD-PBM simulation can satisfactorily predict experimental data with a deviation of 7.76 % for carbon yield and 10.29 % for particle growth rate. Furthermore, the model is used to explore the effects of several operating conditions (i.e., ethylene mole fraction, superficial gas velocity, initial bed height) on carbon yield, hydrogen yield, particle growth rate and bed expansion ratio. The simulation results and experimental data (or those predicted by empirical equations) share similar variation trends. The proposed CFD-PBM coupling model can be further improved to guide the operation and optimization of CNTs production process.

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.