CO₂ Reforming of Methane over Ni/MgO Catalysts Promoted with Zr and La Oxides

Abstract

An investigation on carbon dioxide reforming of methane (DRM) to synthesis gas (H2 and CO) was carried out with several synthesized Ni‐based catalysts. Mixed oxide supports (MgO‐ZrO2 and MgO‐La2O3), were prepared using co‐precipitation method with K2CO3 as the precipitant. The findings indicated a high level of catalytic activity and stability of synthesized Ni‐based catalysts for DRM. Different techniques, namely, XRD, XPS, H2‐TPR, BET, TEM, FESEM, and TGA, were employed to perform the characterization of synthesized catalysts. It was found that with the addition of promoter Zr, the catalyst Ni/Mg0.85Zr0.15O showed a high level of activity (CH4; 86%, and CO2; 98%) and better stability. The significant anti‐coking activity of the reduced catalyst with low Ni metal was evaluated. Furthermore, this research study also examined the performance of the catalyst activity and stability. The results obtained from the temperature program reduction (H2‐TPR) revealed that the presence of ZrO2 with MgO support can enhance Ni reducibility in comparison to La2O3, which is an important indicator of high activity and stability of the Ni catalysts for DRM. It was also found that the presence of La2O3 did not show any effects on the stability of the catalyst.

Enhancing Thermocatalytic Activities by Upshifting the d‐Band Center of Exsolved Co‐Ni‐Fe Ternary Alloy Nanoparticles for the Dry Reforming of Methane

“…Thei nitial decline appears to be due to the evaporation of moisture and loss of oxygen. [33][34][35] The subsequent increase is due to metal oxidation. Theweight loss due to carbon usually occurs around 600 8 8C, [35] but it is believed that there is no carbon coking as the weight loss is not observed in the sample.T his extremely low carbon yield after about 300 hours of stability test provides solid evidence of kinetically balanced reaction steps at the catalyst surface.…”

Hydrogen‐rich syngas production from bi‐reforming of greenhouse gases over zirconia modified Ni/ MgO catalyst

“…The existence of pore-blocking connected with the impregnation process could result in the reduction of the specific surface area, which is in accordance with the literature. 42,43 Besides, the decline in the surface area with the incorporation of ZrO 2 may be ascribed to high calcination temperature, nevertheless has the benefit of achieving a stable catalyst structure. 44 The crystallite size for the XRD peaks of the MgO (200) plane was estimated using the Debye-Scherrer equation.…”

“…Furthermore, the reducibility of the catalysts improved with the addition of the ZrO 2 , particularly those with MgO support. 43 The presence of ZrO 2 has a remarkable impact on the catalysts' redox properties by initiating oxygen mobility and modifying the Nisupport interactions.…”

Enhancing Thermocatalytic Activities by Upshifting the d‐Band Center of Exsolved Co‐Ni‐Fe Ternary Alloy Nanoparticles for the Dry Reforming of Methane

“…It decreases at the beginning but increases continuously above about 200 °C. The initial decline appears to be due to the evaporation of moisture and loss of oxygen [33–35] . The subsequent increase is due to metal oxidation.…”