Abstract
Methanation reaction of carbon dioxide is currently envisaged as a facile solution for the storage and transportation of low-grade energies, contributing at the same time to the mitigation of CO2 emissions. In this work, a nickel catalyst impregnated onto a new support, Engelhard Titanium Silicates (ETS), is proposed, and its catalytic performance was tested toward the CO2 methanation reaction. Two types of ETS material were investigated, ETS-4 and ETS-10, that differ from each other in the titanium content, with Si/Ti around 2 and 3% by weight, respectively. Catalysts, loaded with 5% of nickel, were tested in the CO2 methanation reaction in the temperature range of 300–500 °C and were characterized by XRD, SEM–EDX, N2 adsorption–desorption and H2-TPR. Results showed an interesting catalytic activity of the Ni/ETS catalysts. Particularly, the best catalytic performances are showed by Ni/ETS-10: 68% CO2 conversion and 98% CH4 selectivity at T = 400 °C. The comparison of catalytic performance of Ni/ETS-10 with those obtained by other Ni-zeolites catalysts confirms that Ni/ETS-10 catalyst is a promising one for the CO2 methanation reaction.
Highlights
The Power to Gas technology, based on the conversion of electricity to hydrogen via electrolysis, is regarded among the most environmentally sustainable approaches that could enable the chemical storage of energy [1]
We investigated the suitability of Engelhard Titanium Silicates (ETS) material as support for Ni catalyst in the methanation reaction
X-ray diffraction patterns of synthesized ETS-4 (Figure 1, ETS-4 fresh) and ETS-10 (Figure 2, ETS-10 fresh) were found to be identical to the reference patterns reported in the literature (COD ID 4002324 and COD ID 7110493), confirming that the synthesized supports are pure ETS-4 and ETS-10
Summary
The Power to Gas technology, based on the conversion of electricity to hydrogen via electrolysis, is regarded among the most environmentally sustainable approaches that could enable the chemical storage of energy [1]. It could be desirable to achieve higher conversions at the higher temperature when reagent gases (carbon monoxide, carbon dioxide and hydrogen) derive from other process, such as the reforming of hydrocarbon coal gasification processes, or came from the exit-streams of the solid oxide electrolyzer cells (SOECs) Despite several metals, such as Ni, Ru, Rh and Co, being used as catalysts [8], Ni is considered the best one due to its low cost and catalytic performance. Santamaría and co-workers have investigated the use of Pt/ETS-10 catalyst for the selective oxidation of CO in the presence of H2, CO2 and H2O concluding that the Pt–ETS-10 catalyst is active and selective in the above-mentioned reaction [19] These materials, due to their porosity features, need more in-depth investigation to improve their application in the catalysis field. Ni/ETS-4 and Ni/ETS-10 catalysts have been prepared by impregnation method, characterized by different analytical techniques and tested in the methanation of carbon dioxide in the temperature range of 300–500 ◦C
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