Carbon dioxide methanation is a well-known reaction that is of interest as a capture and storage process and as a renewable energy storage system based on a power-to-gas conversion process by substitute or synthetic natural gas production. The retrofitting of a continuous operating lab scale was done for the purpose of the methanation reaction as the main aim of the work. The previous plant was a prepared setup which involves the reaction between gas and liquid phase. In the context of this work, the reaction took place in the gas phase, involving carbon dioxide and hydrogen as reactants and nitrogen for purging or diluent in the activation of the catalysts. Also, the present work aims to give a study about four different bi-metallic catalysts based on Ni3Fe with alumina support which were prepared and tested for the methanation reaction. A study of the thermodynamic equilibrium of the reaction and a discussion of the different preparation routes of the catalysts and their advantages and disadvantages is included in this work. The routes followed to prepare the catalysts were deposition precipitation with urea as homogenizing agent, deposition precipitation without urea, incipient wetness impregnation and coprecipitation. The characterization techniques involved in this study were N2-Physisorption, temperature programmed reduction and X-ray powder diffraction. Results about the catalyst activation/deactivation measured with time-on-stream and temperature as well as residence time dependent investigations of the methanation reaction are included in this project. The catalyst obtained with deposition precipitation with urea showed a larger specific surface area, a higher conversion and more activity than the one without the urea. The incipient wetness impregnation results in a catalyst with a little higher conversion than the first one, but with a smaller surface area. The fourth catalyst which corresponds with the coprecipitation method displayed the largest surface area of all the catalysts, however, it could not be tested for technical issues. The conversions achieved were about 60 % for the first and the third routes followed and about 40 % for the second one (deposition precipitation without urea).

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