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Catalytic pyrolysis of glycerol into syngas over ceria-promoted Ni/α-Al2O3 catalyst

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  • Shahirah, Mohd Nasir Nor
  • Gimbun, Jolius
  • Ideris, Asmida
  • Khan, Maksudur R.
  • Cheng, Chin Kui

Abstract

This paper reports on the catalytic pyrolysis of glycerol into syngas over a 3 wt%Ce-20 wt%Ni/77 wt% α-Al2O3 catalyst and at reaction temperatures of 973 K, 1023 K and 1073 K. NH3- and CO2-TPD analyses have revealed that the as-synthesized catalyst was net acidic with acid-to-basic site ratio of 1.24. This provides ideal conditions for chemisorption of glycerol. In addition, the BET specific surface area was 2.89 m2 g−1. The small surface area can be attributed to the thermally stable α-Al2O3 support. In addition, the average crystallite size was 40.22 nm. The catalytic glycerol pyrolysis produced gaseous products that were comprised of H2, CO, CO2 and CH4 only with H2:CO ratios that were consistently less than 2.0. This ratio is suitable for Fischer-Tropsch synthesis. The yields of CO2 and CH4 were several folds lower than the yields of H2 and CO, indicating that the latter were from primary reaction, viz. glycerol decomposition whilst the former were from secondary competing reactions. In addition, the activation energy obtained via Langmuir-Hinshelwood model was 25.34 kJ mol−1. Used catalyst characterization showed that the carbonaceous deposit was in the forms of whisker-type. This type of carbon deposit would not physically deactivate the catalyst.

Suggested Citation

  • Shahirah, Mohd Nasir Nor & Gimbun, Jolius & Ideris, Asmida & Khan, Maksudur R. & Cheng, Chin Kui, 2017. "Catalytic pyrolysis of glycerol into syngas over ceria-promoted Ni/α-Al2O3 catalyst," Renewable Energy, Elsevier, vol. 107(C), pages 223-234.
    • Handle: RePEc:eee:renene:v:107:y:2017:i:c:p:223-234
    DOI: 10.1016/j.renene.2017.02.002
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    References listed on IDEAS

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    1. Siew, Kah Weng & Lee, Hua Chyn & Gimbun, Jolius & Chin, Sim Yee & Khan, Maksudur R. & Taufiq-Yap, Yun Hin & Cheng, Chin Kui, 2015. "Syngas production from glycerol-dry(CO2) reforming over La-promoted Ni/Al2O3 catalyst," Renewable Energy, Elsevier, vol. 74(C), pages 441-447.
    2. Fantozzi, F. & Frassoldati, A. & Bartocci, P. & Cinti, G. & Quagliarini, F. & Bidini, G. & Ranzi, E.M., 2016. "An experimental and kinetic modeling study of glycerol pyrolysis," Applied Energy, Elsevier, vol. 184(C), pages 68-76.
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    Cited by:

    1. Talebian-Kiakalaieh, Amin & Amin, Nor Aishah Saidina, 2017. "Thermo-kinetic and diffusion studies of glycerol dehydration to acrolein using HSiW-γ-Al2O3 supported ZrO2 solid acid catalyst," Renewable Energy, Elsevier, vol. 114(PB), pages 794-804.
    2. Shahirah, Mohd Nasir Nor & Gimbun, Jolius & Lam, Su Shiung & Ng, Yun Hau & Cheng, Chin Kui, 2019. "Synthesis and characterization of a LaNi/α-Al2O3 catalyst and its use in pyrolysis of glycerol to syngas," Renewable Energy, Elsevier, vol. 132(C), pages 1389-1401.

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