Stabil og aktiv nikkelkatalysator til carbondioxid-reformering af methan til syntesegas

摘要

This invention refers to a novel nickel-based catalyst which exhibits excellent activity and stability for carbon dioxide reforming of natural gas (methane) to synthesis gas. The catalyst consists of nickel crystallites in contact with La2O3 carrier or in the form of nickel supported on La2O3 carrier or in the form of nickel on La2O3 particles dispersed on a conventional carrier such as gamma -Al2O3. The stable and active surface of Ni/La2O3 is formed, following two hours of the reaction of carbon dioxide reforming of methane at temperatures higher than 600 DEG C. In contrast to conventional nickel-based catalysts, e.g. Ni/ gamma -Al2O3, the new Ni/La2O3 catalysts (at the stable state) are not prone to coking in the temperature range of 550-850 DEG C, exhibiting excellent stability. Near complete conversion of methane and carbon dioxide, and around 100% selectivity to carbon monoxide and hydrogen are achieved over the Ni/La2O3 catalysts under stoichiometric conditions at temperatures in the neighbourhood of 8oo DEG C and a superficial contact time of ca. 0.02 seconds. $$