Abstract
Carbon dioxide reforming of methane (CDRM) to synthesis gas was studied over various Ni-based catalysts. It is shown that the mixed oxide supports CeO2−ZrO2, CeO2−Al2O3, and La2O3−Al2O3, prepared using surfactant, exhibit a high catalytic activity and stability for CDRM. Temperature program reduction (TPR) results demonstrate that the presence of CeO2, ZrO2, or La2O3 leads to the enhancement of the Ni reducibility compared to Al2O3, which is an important indicator of high activity and stability of these Ni catalysts for CDRM. Our thermodynamic calculations indicate that CeO2 could react with CH4 to produce synthesis gas, and then CO2 might reoxidize CeO2−x to its oxidation state. Furthermore, CeO2 might help in gasification of deposited carbon to inhibit the carbon formation and therefore improve catalyst stability. The presence of alumina tends not to affect the stability of the catalyst as well.
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