Studies On Preparation And Catalytic Performances Of Ni-Co Bimetallic Catalysts For CH₄/CO₂ Reforming To Syngas

The serials of works about Ni-Co bimetallic catalyst were conducted in this dissertation. First, the activity component Co was added into the Ni/BaTiO₃ so as to form the bimetallic catalyst, and then, its characterization and effects on the reaction of CO₂ reforming CH₄ were investigated by activity assay, TPR, TPD and XPS. In comparison to Ni/BaTiO₃ catalyst, bimetallic catalyst exhibits higher catalytic activity, desirable reduction and desorption properties, and better suppressing carbon deposition property. In addition, when the amount of Co added approached 5.0%, the bimetallic catalyst could display most suitable catalytic properties.Subsequently, this dissertation deeply investigated the catalytic behavior of 5.0%Ni- 5.0%Co/BaTiO₃ through the CO₂ reforming CH₄. That is to say, the effects of catalyst precursors, dipping orders, synthetic methods and reactive temperature on properties of Ni-Co bimetallic catalyst have been investigated and discussed with many details by activity assay, TPR, TPD and TEM. For catalyst precursors, the Ni-Co(N)/BaTiO₃ prepared by nitrate have better catalytic activity compared with Ni- Co(Ac)/BaTiO₃ prepared by acetate; for synthetic methods, the Ni-Co bimetallic catalyst prepared by sol-gel have higher catalytic activity, desirable reduction and desorption properties. Furthermore, the result showed that different dipping orders have effect on the catalytic properties of Ni-Co bimetallic catalyst. Compared with two other catalysts, the Ni- Co (F)/BaTiO₃ catalyst has more perfect catalytic properties. Obviously, the reactive temperature also affects the catalytic activity of catalyst. The experiment indicated that the conversion of CO₂ and CH₄ evidently...