Study On Nickel-based Perovskite Catalyst For Carbon Dioxide Reforms Of Methane

It is well known that in the 21st century today, energy security and environmental issues received extensive attention of various countries around the world. China's carbon emissions had already been more than the sum of the European Union and the United States and reached 10 billion tons in 2013. At the same time, China's per capita carbon emissions was up to 7.2 tons and exceed the European Union for the first time. Natural gas ?CH₄? as the most development potential clean energy future will occupy the more and more important position in the global energy structure, so the natural gas reforming syngas to optimize energy structure, reduce oil dependence is of great importance.In this paper, we prepared by sol-gel method nickel perovskite catalyst to study its application in Methane Reforming of Carbon Dioxide. LaNiO₃ catalyst was prepared by sol-gel method and doping Ce on the modification, through investigating the reaction temperature, space velocity and activation gas influence on catalytic activity.Comparing the influence of different content of the Ce doping on the reactivity, we find the optimal Ce doping amount.we use X-ray diffraction ?XRD?, thermogravimetric analysis ?TG-DTG?, scanning electron microscope ?SEM? and other technical means of analyzing to reseach the morphology structure of catalyst. It was found that:The best reaction temperature is 1073 K and the best optimum reaction airspeed of 10000 ml/h · gcat.The best activation gas of catalysts is hydrogen.In the different content of Ce doping modification La_0.8Ce_0.2NiO₃ has the best catalytic activity. Methane and carbon dioxide conversion is 80% and 84% and the yield of hydrogen and carbon monoxide is 58% and 65%.This paper also studies the La₂NiO₄ catalysts prepared using sol gel method, compared with LaNiO₃ and Ni/La₂O₃ activity of the catalysts and use different amount of alkaline earth metal Ca, Sr for doping modification La₂NiO₄. Experiments found that La₂NiO₄ showed good catalytic activity compared with LaNiO2 and Ni/La₂O₃ and La₂NiO₄ exhibit smaller Ni0 particle size. In the different content of Ca doping modification La1.6Ca0.4NiO4 has the best catalytic activity that the conversion of methane and carbon dioxide is 78,6% and 90%, the yield of hydrogen and carbon monoxide is 63% and 68% o. In the different content of Sr doping modification, La1.6Sr0.4NiO4 has the best catalytic activity which the conversion of methane and carbon dioxide is 84% and 91% as well as the yield of hydrogen and carbon monoxide is 66% and 71%.