An EXAFS and IR study of the CO adsorption-induced morphology change in ruthenium catalysts

Improved Performance of Ru/γ‐Al2O3 Catalysts in the Selective Methanation of CO in CO2‐Rich Reformate Gases upon Transient Exposure to Water‐Containing Reaction Gas

“…based on IR measurements [24][25][26] and by Mizushima et al based on ac ombinationo fE XAFS and IR measurements. [27][28][29] These structuralresults provide asimple and straightforward explanation for the findings of ah igherR um ass-normalized activity and selectivity for CO methanation under dry reaction conditions after activation in wet reformate than after activation in dry reformate.…”

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“…EXAFS [34][35][36] and IR studies [3,19,35,36] have shown that the local structure around the metal atoms in Ru/TiO 2 [3], Ru/γ-Al 2 O 3 [19,35,36] and Ru/MgO [36] catalysts is influenced by CO adsorption. Mizushima et al [35,36], however, questioned the occurrence of oxidative disruption of Ru clusters emphasizing the reductive properties of CO. The reaction scheme above contradicts the experimental fact that the removal of adsorbed CO leads to restoration of the original spectrum in the ν(OH) region [36].…”

“…Mizushima et al [35,36], however, questioned the occurrence of oxidative disruption of Ru clusters emphasizing the reductive properties of CO. The reaction scheme above contradicts the experimental fact that the removal of adsorbed CO leads to restoration of the original spectrum in the ν(OH) region [36]. Moreover, formation of Ru n+ ions during CO adsorption occurs on almost completely dehydroxylated surfaces [3].…”

Structure and Reactivity of Bimetallic FeIr/SiO2 Catalysts after Reduction and during High-Pressure CO Hydrogenation

“…CO-induced changes in structure are also known to occur in different types of supported noble metal catalysts (32)(33)(34). Nevertheless, the structure of the activated FeM/SiO 2 catalysts has not yet received much attention.…”