A fluidized-bed model for NiMgW-catalyzed CO2 methanation--颗粒学报PARTICUOLOGY

Jia, C., Dai, Y., Yang, Y., & Chew, J. W. (2020). A fluidized-bed model for NiMgW-catalyzed CO2 methanation. Particuology, 49, 55-64. https://doi.org/10.1016/j.partic.2019.05.004

A fluidized-bed model for NiMgW-catalyzed CO₂ methanation

Chunmiao Jia ^a, Yihu Dai ^b, Yanhui Yang ^b, Jia Wei Chew ^{a c *}

a School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459, Singapore
b Institute of Advanced Synthesis, Nanjing Tech University, Nanjing 211800, Jiangsu Province, China
c Singapore Membrane Technology Center, Nanyang Technological University, Singapore 637141, Singapore

10.1016/j.partic.2019.05.004

Volume 49, April 2020, Pages 55-64

Received 20 April 2018, Revised 24 April 2019, Accepted 6 May 2019, Available online 18 July 2019, Version of Record 26 February 2020.

E-mail: JCHEW@ntu.edu.sg; chewj@colorado.edu

Highlights

• CO₂ methanation using renewable energy is a promising process for CO₂ recycling.

• Model of fluidized-bed reactor for CO₂ methanation.

• Characterized reaction kinetics of the NiMgW catalyst for model validation.

• Sensitivity analysis to determine effects of operating parameters on reactor performance.

Abstract

The reduction of carbon dioxide to methane by hydrogen ("CO₂ methanation") using renewable energy is a promising process for recycling CO₂. Better catalysts and better reactors are both required for the practical application of CO₂ methanation. This study examines how the operating parameters affect CO₂ methanation in a highly efficient fluidized-bed reactor. We first measured the kinetics of the CO₂ methanation reaction using an NiMgW catalyst, which has been reported to exhibit superior catalytic performance. We then developed a fluidized-bed reactor model based on an earlier model for CO₂ methanation. The fluidized bed model indicated that the NiMgW was indeed superior to two other previously studied catalysts in terms of faster conversion of reactants and higher concentrations of product CH₄ throughout the reactor. The overall rate of production of CH₄ increased with temperature and H₂/CO₂ ratio and decreased as the inlet reactant flow rate, catalyst particle diameter, and catalyst particle sphericity increased.

Graphical abstract

Keywords

Fluidized-bed reactor model; CO₂ methanation; NiMgW catalyst; Reaction kinetics; Sensitivity analysis

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