Regular ArticleElementary Steps in CO Hydrogenation on Rh Catalysts Supported on ZrO2 and Mo/ZrO2
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In-situ DRIFTS steady-state study of CO<inf>2</inf> and CO methanation over Ni-promoted catalysts
2023, FuelCitation Excerpt :Concerning the evolution of the other surface species, it is clearly observed that the surface concentration of formates increases exponentially with time analogously for the three samples. It is well-known that the interaction of CO with the surface of oxidic surfaces result in the formation of adsorbed formate species due to the reaction between CO and surface hydroxyls groups [60]. Herein, it is evident that the formates have a different role for CO methanation than that shown for CO2 methanation, where they act as precursors for CO formation.
CO/H<inf>2</inf> adsorption on a Ru/Al<inf>2</inf>O<inf>3</inf> model catalyst for Fischer Trospch: Effect of water concentration on the surface species
2018, Applied Catalysis B: EnvironmentalCitation Excerpt :Hydrogen required by this reaction has to be produced by the formate species in the metal-support interphase decomposition as previously proposed [53]. Early studies on the interaction of CO with the surface of Rh/ZrO2 catalysts have pointed out that CO adsorbed on Rh may react with surface hydroxyls groups of ZrO2 resulting in the formation of adsorbed formate species [64]. On the other hand, the reaction of gas phase CO with OH radicals has been demonstrated as the principal source of CO2 in hydrocarbon oxidation [65].
On the way of understanding the behavior of nanometer-scale metallic particles toward the adsorption of CO and NO molecules
2018, Comptes Rendus ChimieCitation Excerpt :In fact, the presence of a second metal alters significantly the physical and chemical properties of metallic surfaces as compared with the corresponding single metal systems. CO hydrogenation over ZrO2- and Mo/ZrO2-supported Rh catalysts, using TEM and FTIR, and chemisorption of H2, O2, and CO have been studied by Guglielminotti et al. [98]. These authors have noticed that the two metals, Mo and Rh, form a very complex interacting system.
Fe-promotion of supported Rh catalysts for direct conversion of syngas to ethanol
2009, Journal of CatalysisCitation Excerpt :In fact, a wide variety of supports as well as promoters can be used to affect the size, nature and the number of active sites for ethanol formation. Although supports such as ceria [18,24], vanadia [19], niobia [25], zirconia [26], and promoters such as V, Nb, Ta [27], Sm [28], and Mo [29] have a positive influence on the reaction, Mn also appears to be a favorable promoter [20,21,30–33]. Examples of other prior art on the catalytic synthesis of hydrocarbons and oxygen-containing compounds from CO and H2 over supported Rh catalysts include the works of Ichikawa et al. [34,35], Arakawa et al. [36,37], Prins et al. [38,39], and Niemantsverdriet et al. [40,41].
An infrared study of the intermediates of methanol synthesis from carbon dioxide over Pd/β-Ga <inf>2</inf>O <inf>3</inf>
2004, Journal of CatalysisCitation Excerpt :Hence, only formate species should account for those infrared peaks, i.e., monodentate and bidentate formate (from now on, m-HCOO and b-HCOO, respectively). Both last species can be easily distinguished by the wavenumber location of their asymmetric and symmetric CO stretching modes, as νas(CO2) is higher for m-HCOO than for b-HCOO, while the opposite occurs for the position of the νs(CO2) mode [31,37,39–41,48–69]. Additionally, Table 2 nicely shows that the assignments to all these bands to formates are unequivocal, in accordance with the near agreement between the experimental and predicted shifting of the band positions observed for their deuterated and hydrogenated forms.