Temperature-programmed reduction of nickel steam reforming catalyst with glucose

Article English OPEN
Cheng, F ; Dupont, VAL ; Twigg, MV (2016)
  • Publisher: Elsevier
  • Journal: Applied Catalysis A: General, volume 527, pages 1-8 (issn: 0926-860X)
  • Related identifiers: doi: 10.1016/j.apcata.2016.08.013
  • Subject: Process Chemistry and Technology | Catalysis

Temperature-programmed reduction (TPR) of a NiO/α-Al2O3 steam reforming catalyst with glucose under a N2 flow was investigated using TGA-FTIR technique. A series of catalyst samples obtained at different temperatures during the TPR were characterised by XRD, CHN elemental analysis, SEM-EDX and TPO. Results showed that the whole TPR covering from room temperature to 900 °C consisted of two reactive processes. They were glucose pyrolysis producing carbonaceous materials (char), and NiO reduction by the char resulting in CO2 as a main product. When the initial mass ratio of glucose to the catalyst was 1:10, the catalyst could be completely reduced without carbon remaining. Moreover, two mass loss peaks were observed at around 440 °C and 670 °C, respectively, during the reduction. Based on the experiments of char characterisation, H2 TPR and excess glucose TPR, a two-stage reduction mechanism was proposed. The first reduction stage was attributed to a solid reaction between NiO and char. The second stage was assigned to NiO being reduced by the CO produced by char gasification with CO2. Their apparent activation energies were 197 ± 19 kJ/mol and 316 ± 17 kJ/mol, respectively, estimated using the Kissinger method.
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