Abstract
The dry reforming of methane (DRM) process has attracted research interest because of its ability to mitigate the detrimental impacts of greenhouse gases such as methane (CH4) and carbon dioxide (CO2) and produce alcohols and clean fuel. In view of this importance of DRM, we disclosed the efficiency of a new nickel-based catalyst, which was promoted with magnesia (MgO) and supported over gamma-alumina (γ-Al2O3) doped with silica (SiO2), toward DRM. The synthesized catalysts were characterized by H2 temperature-programmed reduction (H2-TPR), X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Thermogravimetric analysis (TGA), and Transmission electron microscopy (TEM) techniques. The effect of MgO weight percent loading (0.0, 1.0, 2.0, and 3.0 wt. %) was examined because the catalytic performance was found to be a function of this parameter. An optimum loading of 2.0 wt. % of MgO was obtained, where the conversion of CH4 and CO2 at 800 °C were 86% and 91%, respectively, while the syngas (H2/CO) ratios relied on temperature and were in the range of 0.85 to 0.95. The TGA measurement of the best catalyst, which was operated over a 15-h reaction time, displayed negligible weight loss (<9.0 wt. %) due to carbon deposition, indicating the good resistance of our catalyst system to the deposition of carbon owing to the dopant and the modifier. TEM images showed the presence of multiwalled carbon nanotubes, confirming the TGA.
Highlights
Synthesis gas, a mixture of hydrogen (H2 ) and carbon monoxide (CO), is a vital material for the synthesis of useful liquid fuels, such as methyl alcohol and dimethyl ether, through a Fischer–Tropsch process [1,2]
Al-Fatesh et al promoted nickel catalyst over mesoporous zirconia for dry reforming of methane (DRM) by using various loadings of MgO. They found that the potent interaction of NiO–MgO solid solution with the ZrO2 support was essential for obtaining high conversions of both methane and carbon dioxide
To comprehend differences in the performance of the prepared catalysts, nitrogen adsorption–desorption isotherms of the catalysts were registered for investigating the textural attributes: specific surface area (SBET ), pore volume (Pv ), and pore diameter (Pd )
Summary
Synthesis gas (syngas), a mixture of hydrogen (H2 ) and carbon monoxide (CO), is a vital material for the synthesis of useful liquid fuels, such as methyl alcohol and dimethyl ether, through a Fischer–Tropsch process [1,2]. They found that the potent interaction of NiO–MgO solid solution with the ZrO2 support was essential for obtaining high conversions of both methane and carbon dioxide. Over their mixture of metal oxides, carbon dioxide functioned as a soft oxidizing for surface coke, entailing the stability of catalytic performance [16]. In another study conducted by Bahare et al [18], MgO-promoted Ni/MgSiO3 showed the highest catalytic performance among the unpromoted and those promoted with other metal oxides They concluded that the addition of MgO increased Ni dispersion and provided suitable Ni active sites for the reactants. The effect of MgO wt. % loading (0.0, 1.0, 2.0, and 3.0) was investigated on the catalyst activity and stability, which is expressed in conversions of methane and carbon dioxide, and the molar ratio of H2 /CO
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