Physical and chemical characteristics and activity of nickel-modified cobalt-iron-containing catalysts in the reaction of dry reforming of methane

Abstract

In the process of dry reforming of methane (DRM), the activity of low-percentage catalysts based on cobalt and iron oxides and their modification with nickel oxide was studied. It has been established that the addition of nickel oxide into the Fe₂O₃/γ-Al₂O₃ catalyst increases the degree of methane conversion from 14 to 89%, and also increases the yield of target reaction products H₂ to 43.0 vol.%, CO to 46.1 vol.% at 850 °C. On a Co₃О₄-NiО/γ-Al₂O₃ catalyst at 850 °C, methane conversion reaches to 88.1%, the yield of H₂ and CO is 44.8%. TPR-H₂ analyzes showed that the introduction of nickel oxide into Fe₂O₃/γ-Al₂O₃ composition, in contrast to the Co₃O₄/γ-Al₂O₃ catalyst, the temperature peaks of Fe₂O₃-NiО/γ-Al₂O₃, reduction shift towards lower temperatures and weaken the interaction of metals with the support - γ-Al₂O₃ and thereby the amount of active reduced particles of iron and nickel oxides increases, which ensures good catalytic activity of Fe₂O₃-NiО/γ-Al₂O₃. According to the XRD results, spinel-like form - NiFe₂O₄, NiAl₂O₄ and CoAl₂O₄, also phase as Fe₂O₃ were obtained on the Fe₂O₃-NiО/γ-Al₂O₃ catalyst. This indicates that the developed catalysts form new phases that are active at high temperatures to produce synthesis gas in reduction-oxidation processes during the DRM reaction.