Abstract
The nickel-based catalysts supported on MgO-modified α-Al2O3, CeO2, and SBA-15 were prepared by impregnation method and investigated by N2 physisorption measurements, powder X-ray diffraction, Raman spectroscopy, H2 temperature-programmed reduction, CO2 temperature-programmed desorption, and transmission electron microscopy. Investigation of the kinetics of the dry reforming of methane (DRM) was carried out in gradientless circulating micro-flow system at atmospheric pressure and temperature range of 600–800 °C. The results showed that carriers have a prominent role in characterising the physico-chemical properties of catalysts such as specific surface area, dispersity of active metal, reducibility and basicity that greatly affect the adsorption feature and activity of NiO catalyst. However, the kinetic equation of DRM on three catalysts was found to be written by a common fractional equation, following a dual-site Langmuir–Hinshelwood Hougen Watson model. The order in the catalyst reducibility and apparent rate constant was observed as follows: NiMg/Al<Ni/Ce<Ni/SBA, while the apparent activation energy (E) is in the opposite order. The highest activity was observed on the catalyst containing 31.2 wt% Ni supported on SBA-15.
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