The catalytic carbon dioxide (CO2) reforming of methane (CH4) (CRM), two major greenhouse gases, provides an ideal solution to relieve global warming together with producing syngas (CH4 + CO2 → 2H2 + 2CO) as a platform chemical for a range of valuable chemicals and fuels. Noble metals exhibit high stability in CRM but are generally uneconomical. Ni-based catalysts are the most widely used, however, are suffered from severe deactivation due to carbon deposition. In this work, various Ni-based catalysts were prepared for exploring the effect of Ni loading, support acidity and promoters on the performance and stability of Ni-based catalysts in CRM. All the Ni (2.5, 5, 10 wt%) catalyst supported on siliceous support provided similar high CH4 conversions (∼98%). Increasing nickel loading increased side reactions for high carbon accumulation. Either increasing or decreasing support acidity can lower CH4 conversion. It was found lowering support acidity could remarkably reduce coke deposition. The promoter, including Al, La, and Fe, were introduced into Ni-based catalysts. The addition of La or Fe oxide can affect nickel oxide reduction and decrease the catalytic activity, while the addition of Al oxide can promote nickel dispersion to improve their performance. Therefore, small Ni particle size and well-controlled support acidity are essential for improving the catalytic activity and the catalyst lifetime in CRM reactions.

Carbon dioxide reforming of methane over Ni-based catalysts: Effects of support properties and metal loading

256th National Meeting (2018)

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