Effect of La2O3 added to NiO/Al2O3 catalyst on partial oxidation of methane to syngas

Partial oxidation of methane to syngas has been studied over NiO/Al2O3 catalyst promoted with La2O3. Addition of La2O3 can lower the ignition temperature of the reaction, which plays an important role in the initial reaction process. Furthermore, it is indicated by TPR and XRD measurements that addition of La2O3 undermines the interaction between NiO and Al2O3 to form new species of LaNiO3 after calcination at 800 degrees C in air. 2%La2O3 added to NiO/Al2O3 not only is the optimal content for catalytic activity, but also efficiently inhibits the carbon deposition on the surface of catalyst in combination with CaO

Structure sensitivity of oxidative coupling of methane and dehydrogenation of ethane over lanthana catalysts.

Structure sensitivity was tested for the oxidative coupling of methane (OCM) and dehydrogenation of ethane (ODHE) over lanthana catalysts. Changes in intrinsic activity with surface area were found for both reactions while changes in selectivity occurred only for OCM. A general interpretation of the structure sensitivity effects is proposed by considering the changes in concentration of active sites for methane and ethane primary activation and total oxidation according to the surface area. Common steps for hydrocarbon activation but slightly distinct for deep oxidation are considered