Abstract
To improve the efficiency of catalysts for methane tri-reforming, the effect of pretreatment conditions of the Ce0.2Ni0.8O1.2/Al2O3 catalyst on its physicochemical and functional properties was studied. A set of methods (thermal analysis, low-temperature nitrogen adsorption, X-ray phase analysis, electron microscopy, temperature-programmed reduction with hydrogen) has established that varying the composition of the gaseous medium (oxidizing, inert, reducing) used during pretreatment at 800 °C allows one to adjust the textural, structural and redox characteristics of the catalyst and, as a consequence, its functional properties. It has been shown that in the series of compositions of the gas environment used in the pretreatment of the catalyst, oxidative → inert → reducing, an increase in the specific surface area and dispersion of the active component is observed, but a decrease in the resistance of the sample to reoxidation and coking. It has been established that the highest and most stable performance of the methane tri-reforming process (H2 yield – 86 % at CH4 conversion – 95 %) is provided by the catalyst after pretreatment in an inert environment due to the implementation of the optimal degree of metal-support interaction and an increase in the concentration of centers involved in CO2 activation.
Published Version
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