Enhanced low‐temperature activity for CO₂ methanation over NiMgAl/SiC composite catalysts

Abstract

Background Carbon dioxide (CO2) methanation is an important reaction in energy and environmental fields, which aims to convert CO2 into natural gas with hydrogen (H2) from renewable sources. One of the technical bottlenecks for CO2 methanation is the lack of feasible catalysts, especially the ones with satisfactory low‐temperature activity. Results The NiMgAl/SiC composite catalyst that was derived from hydrotalcite precursor on the SiC substrate possessed enhanced low‐temperature activity and excellent long‐term stability in CO2 methanation. For the low‐temperature activity, CO2 conversion reached 63.8% and 74.5% at 300 and 325 °C respectively. For the long‐term stability, CO2 conversion merely decreased from 78.4% to 76.9% after 50 h of reaction at 400 °C. Conclusion The NiMgAl/SiC composite catalyst was successfully synthesized by the co‐precipitation method, which exhibited enhanced low‐temperature methanation activity compared with the NiMgAl and Ni/SiC catalysts. The superior low‐temperature activity was mainly ascribed to two structural parameters. One was the small nickel (Ni) nanoparticle size, which was endowed by the unique structure of the hydrotalcite precursor. The other one was the high reducibility of Ni species, which was rendered by the appropriate metal‐support interactions. The present work provides guidelines for the synthesis of highly efficient composite catalysts for energy and environmental applications. © 2019 Society of Chemical Industry

Heterogeneous Catalytic Hydrogenation of Carbon Dioxide Into Hydrocarbons: Achievements and Prospects

“…γ-Al2O3 [37,38], SiO2 [39][40][41], TiO2 [42], CeO2 [43,44], ZrO2 [45,46], hydrotalcite [47], various zeolites and carbon materials, including carbon nanotubes, etc. [48][49][50]. Note that acidity, structural and porous characteristics (surface area, pore volume, and their size distribution) of the support play an important role in determining the properties of catalysts for CO2 methanation [51,52].…”

In Focus: Emerging leaders in future materials for energy and environmental applications

“…However, the reliance on precious Pt-group for the catalytic conversion of CO 2 to fossil fuels may be impractical. Wang et al 4 exemplify that conversion of CO 2 into methane in a presence of H 2 can be carried out at a remarkably low temperature using an earth-abundant NiMgAl-catalyst on a SiC substrate instead of commonly used noble metal catalysts such as Rh and Ru. The conversion rate to CH 4 at 325 ∘ C is 100% which highlights the potency of the catalyst to be utilized in conversion process at scale due to the relative simplicity of synthesis and high abundance of the catalyst's components.…”

“…However, the reliance on precious Pt‐group for the catalytic conversion of CO 2 to fossil fuels may be impractical. Wang et al . exemplify that conversion of CO 2 into methane in a presence of H 2 can be carried out at a remarkably low temperature using an earth‐abundant NiMgAl‐catalyst on a SiC substrate instead of commonly used noble metal catalysts such as Rh and Ru.…”

Catalytic Reduction of CO2 to CO via Reverse Water Gas Shift Reaction: Recent Advances in the Design of Active and Selective Supported Metal Catalysts

“…Under atmospheric pressure, the yield of methanol is rather low or absent [16] and thus can be ignored. However, the strongly exothermic methanation reaction is thermodynamically more favored over the mildly endothermic RWGS reaction at low reaction temperatures [17][18][19][20][21]; as such, minimizing the methanation during RWGS becomes a great challenge. Therefore, active RWGS catalysts operated at low temperatures with enhanced CO selectivity and minimized CH 4 selectivity should be developed.…”