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• W1892123225 abstract "Raman spectroscopic technique has been used to characterize a Ru/TiO 2 catalyst and to follow in situ their structural changes during the CO selective methanation reaction (S‐MET). For a better comprehension of the catalytic mechanism, the in‐situ Raman study of the catalysts activation (reduction) process, the isolated CO and CO 2 methanation reactions and the effect of the composition of the reactive stream (H 2 O and CO 2 presence) have been carried out. Raman spectroscopy evidences that the catalyst is composed by islands of TiO 2 –RuO 2 solid solutions, constituting Ru–TiO 2 interphases in the form of Ru x Ti 1 − x O 2 rutile type solid solutions. The activation procedure with H 2 at 300 °C promotes the reduction of the RuO 2 –TiO 2 islands generating Ru o –Ti 3+ centers. The spectroscopic changes are in agreement with the strong increase in chemical reactivity as increasing the carbonaceous intermediates observed. The selective methanation of CO proceeds after their adsorption on these Ru o –Ti 3+ active centers and subsequent C―O dissociation throughout the formation of CH x /C n H x /C n H x O/CH x ―CO species. These intermediates are transformed into CH 4 by a combination of hydrogenation reactions. The formation of carbonaceous species during the methanation of CO and CO 2 suggests that the CO presence is required to promote the CO 2 methanation. Similar carbonaceous species are detected when the selective CO methanation is carried out with water in the stream. However, the activation of the catalysts occurs at much lower temperatures, and the carbon oxidation is favored by the oxidative effect of water. Copyright © 2015 John Wiley & Sons, Ltd." @default.
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• W1892123225 date "2015-08-26" @default.
• W1892123225 modified "2023-10-14" @default.
• W1892123225 title "<i>In‐situ</i> Raman spectroscopy study of Ru/TiO₂ catalyst in the selective methanation of CO" @default.
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• W1892123225 doi "https://doi.org/10.1002/jrs.4774" @default.
• W1892123225 hasPublicationYear "2015" @default.
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