Effect of MgO addition on the basicity of Ni/ZrO2 and on its catalytic activity in carbon dioxide reforming of methane

Abstract

Abstract The effect of the MgO content on the basicity and on the catalytic performance of Ni/ZrO 2 –MgO catalysts for carbon dioxide reforming of methane was studied. MgO addition to the zirconia support by co-precipitation (5% MgO) had several effects: stabilized the zirconia tetragonal phase by increasing its thermal stability, increased the basicity of the support, and decreased the reducibility of Ni 2+ . The CO 2 desorption energy distribution functions calculated from the TPD-CO 2 profiles were centred at activation energies around 100–134 kJ mol −1 . Besides the effect due to the modification of the zirconia properties by MgO addition, the catalytic activity was also related to the reduction degree of nickel on Ni/ZrO 2 –MgO catalysts, while the catalyst stability was related to the basic properties of the supports.