Studies of the dissociation activities of methane and carbon dioxide over supported nickel catalyst

• Pulse experiment for testing the dissociation activity of CH4 and CO2 on supported Ni.
• Dissociated CO2 easily produced adsorbed carbon on (Ni)/δ-Al2O3.
• Ni/CeO2 has a high dissociation activity of CO2 to produce CO.
• Pre-adsorbed CHx species increased the dissociation of CO2 to CO on Ni/δ-Al2O3.
• CHx was effectively released as CO from the surface by pre-adsorbed oxygen on Ni/CeO2.

Pulse experiments for testing the dissociation activity of CH4 and CO2 were carried out on supported Ni catalysts (Ni/Al2O3, Ni/La2O3, and Ni/CeO2) with or without pre-adsorbed species on the catalysts. The CO2 pulse on Ni/Al2O3 produced a small amount of CO without pre-adsorbed species, while a CO2 pulse produced more CO in the presence of CHx species on Ni/Al2O3. The CHx species on Ni/Al2O3 promote the dissociation of CO2 on the catalyst. The production of CO by the CH4 pulse was low on Ni/Al2O3 regardless of the presence of adsorbed species by the pre-pulse of CO2, while both H2 and CO were effectively produced on Ni/CeO2.

Figure optionsDownload high-quality image (112 K)Download as PowerPoint slide