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Modelling and optimization of syngas production by methane dry reforming over samarium oxide supported cobalt catalyst: response surface methodology and artificial neural networks approach

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Abstract

The reforming of methane by carbon dioxide for the production of syngas is a potential technological route for the mitigation of greenhouse gases. However, the process is highly endothermic and often accompanied by catalyst deactivation from sintering and carbon deposition. Besides, the applications of dissimilar catalytic systems in methane dry reforming have made it difficult to obtain generalized optimum conditions for the desired products. Hence, optimization studies of any catalytic system often resulted in a unique optimum condition. The present study aimed to investigate optimum conditions of variables such as methane (CH4) partial pressure, carbon dioxide (CO2) partial pressure and reaction temperature that will maximize syngas yields from methane dry reforming over samarium oxide supported cobalt (Co/Sm2O3) catalyst. The Co/Sm2O3 catalyst was synthesized using wet-impregnation method and characterized by thermogravimetric analysis), field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray powder diffraction and nitrogen (N2) physisorption. Syngas production by methane dry reforming over the synthesized Co/Sm2O3 catalyst was investigated in a stainless steel fixed-bed reactor. The process variables (CH4 partial pressure, CO2 partial pressure and reaction temperature) for the syngas production were optimized using response surface methodology (RSM). The RSM and artificial neural networks (ANNs) were used to predict the syngas production from the experimental data. The comparative analysis between the two models showed that the ANN model has better prediction of the syngas yields compared to the RSM model as evident from the good agreement between the observed and the predicted values. At maximum desirability value of 0.97, optimum CH4 and CO2 partial pressures of 47.9 and 48.9 kPa were obtained at reaction temperature of 735 °C resulting in syngas yield of ~79.4 and 79.0% for hydrogen (H2) and carbon monoxide (CO), respectively.

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Acknowledgements

The authors would like to acknowledge the Sciencefund RDU130501 granted by the Ministry of Science, Technology and Innovation, Malaysia (MOSTI), and the Doctoral scholarship granted to Bamidele Victor Ayodele by Universiti Malaysia Pahang.

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Authors and Affiliations

  1. Faculty of Chemical and Natural Resources Engineering, Universiti Malaysia Pahang, Lebuhraya Tun Razak, 26300, Gambang, Kuantan, Pahang, Malaysia

    Bamidele V. Ayodele, Maksudur R. Khan & Chin Kui Cheng

  2. Center of Excellence for Advanced Research in Fluid Flow, Lebuhraya Tun Razak, 26300, Gambang, Kuantan, Pahang, Malaysia

    Bamidele V. Ayodele, Maksudur R. Khan & Chin Kui Cheng

  3. Department of Chemical Engineering, King Faisal University, Al Hasa, Saudi Arabia

    Safdar Sk Nooruddin

Authors
  1. Bamidele V. Ayodele
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  2. Maksudur R. Khan
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  3. Safdar Sk Nooruddin
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  4. Chin Kui Cheng
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Correspondence to Chin Kui Cheng.

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Ayodele, B.V., Khan, M.R., Nooruddin, S.S. et al. Modelling and optimization of syngas production by methane dry reforming over samarium oxide supported cobalt catalyst: response surface methodology and artificial neural networks approach. Clean Techn Environ Policy 19, 1181–1193 (2017). https://doi.org/10.1007/s10098-016-1318-5

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