Intrinsic Kinetics Study of CO Methanation on Ni-Mo-SiO₂ Catalyst Prepared by Hydrothermal Method

Abstract:

A comprehensive kinetic model for methanation of syngas on Ni-Mo-SiO₂ catalyst was developed on a fixed bed reactor data. The CO and H₂ conversion, methane selectivity and yield were obtained in a wide range of operating conditions including 300 < T < 450°C, 1 < H₂/CO <4 and 0.1 < P < 1.5 MPa with the total weight hourly space velocity (WHSV) of 60000 ml/h/g. A 6-step reaction scheme defined to the description of a reaction network that considers both catalytic and gas-phase as well as primary and consecutive reaction steps to predict the performance of the syngas methantion. Orthogonal design method was adopted to select test points with temperature, pressure and feed compositions as factors and the kinetic rates involved Langmuir – Hinshelwood equation kinetic model. The kinetic rate parameters were estimated using the Least Square Method by MATLAB. Comparing the experimental and model predicted data showed that presented model has a reasonable fit between the experimental data and the predicted values with average absolute relative deviation of ±9.8%.

• Periodical: Materials Science Forum (Volume 921)
• Pages: 40-47
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.921.40
• Online since: May 2018
• Authors: Jia Ying Zhang*
• Keywords: CO Methanation, Hydrothermal Method, Intrinsic Kinetics, Modeling, Ni-Mo-SiO₂ Catalyst

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