The distinctive effects of glucose-derived carbon on the performance of ni-based catalysts in methane dry reforming

This study aimed to investigate the effect of carbon derived from glucose (C) on the physicochemical characteristics and catalytic activity of Ni, supported over SiO₂, ZSM-5, and TiO₂ in methane dry reforming. Among the Ni catalysts without C, Ni/SiO₂ exhibited the highest CH₄-CO₂ conversion and stability at all experimented temperatures. On the other hand, the C-incorporated catalysts prepared by glucose impregnation, followed by pyrolysis, showed dissimilar performances. C improved the stability of Ni/SiO₂ in the reforming at 650^◦C and 750^◦C and increased the CH₄ and CO₂ conversion to the level close to the thermodynamic equilibrium at 850^◦C. However, this element did not substantially affect the activity of Ni/ZSM-5 and exerted a retarding effect on Ni/TiO₂. Characterizations with H₂-TPD, XRD, EXAFS, and STEM-EDS revealed that the different influences of C by the supports were attributed to the extent of metal dispersion and metal-support interaction.