An extra layer of complexity

Chandler, Bert D.

doi:10.1038/nchem.2724

Cited by 30 publications

(13 citation statements)

References 7 publications

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“…These observations suggested the existence of an A-SMSI state; a high coverage of HCO x promotes the formation of oxygen vacancies at the TiO 2 surface, and thereby causes migration of the support onto Rh [75]. It is rare that a paper is valued in the same issue as in the present case [76].…”

Section: Reaction Of Co 2 With H 2 On Titania-supported Rh Catalystsmentioning

confidence: 58%

Hydrogenation of Carbon Dioxide on Supported Rh Catalysts

Erdöhelyi

2020

Catalysts

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The constant increase in the CO2 concentration in the atmosphere requires us to look for opportunities to convert CO2 into more valuable compounds. In this review, the activity and selectivity of different supported metal catalysts were compared in the hydrogenation of carbon dioxide, and found that Rh is one of the best samples. The possibility of the CO2 dissociation on clean metal and on supported Rh was discussed separately. The hydrogenation of CO2 produces mainly CH4 and CO, but the selectivity of the reaction is affected by the support, in some cases the reduction of the support, the particle size of Rh, and the different additives. At higher pressure methanol, ethanol, and acetic acid could be also formed. The activity of the various supported Rh catalysts was compared and the results obtained for TiO2-, SiO2-, and Al2O3-supported catalysts were discussed in a separate chapter. The compounds formed on the surface of the catalysts during the reaction are shown in detail; mostly, different CO species, adsorbed formate groups, and different carbonates were detected. In a separate chapter the mechanism of the reaction was also discussed.

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Section: Reaction Of Co 2 With H 2 On Titania-supported Rh Catalystsmentioning

confidence: 58%

Hydrogenation of Carbon Dioxide on Supported Rh Catalysts

Erdöhelyi

2020

Catalysts

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“…Indeed, the overlayer originating from A-SMSI was thought to be porous enough to allow molecules to interact with the metal surface in the work of Matsubu et al [24] While the mechanism of A-SMSI formation is still unclear, several similarities with monocarboxylic acid-induced oxygen vacancy formation on titania can be discerned. [63,64] For example, formic acid is known to adsorb dissociatively on TiO 2 , with dissociated protons combining with nearby bridging oxygens, producing bridging hydroxyl groups, followed by H 2 O dissociation and oxygen vacancy formation. [62,63] This finally results in a HCO x -covered, disordered and reduced titania surface.…”

Section: Adsorbate-induced Strong Metal Support Interactionmentioning

confidence: 99%

Phase‐Dependent Stability and Substrate‐Induced Deactivation by Strong Metal‐Support Interaction of Ru/TiO₂ Catalysts for the Hydrogenation of Levulinic Acid

et al. 2019

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The choice of support type has a profound influence on catalyst performance in liquid phase hydrogenation reactions, including the catalytic hydrogenation of biomass‐derived levulinic acid (LA) to γ‐valerolactone (GVL). Catalytic performance, including stability, of three Ru/TiO2 catalysts, having a similar mean Ru metal nanoparticle size but supported on three types of TiO2, namely P25, rutile and anatase, is evaluated by multiple reuse under batch reactor conditions. T3he catalysts’ physicochemical properties before and after recycling are characterized by XRD, STEM, TGA and FT‐IR after CO stepwise adsorption. The results show that the deactivation seen for (mixed) anatase‐supported catalysts in dioxane can be attributed to strong metal‐support interaction (SMSI) rather than coke formation or metal sintering, with the rutile‐based catalyst being more resistant against such support reduction. Notably, SMSI formation under the applied, relatively mild conditions only occurs in the presence of organic acids, such as LA or valeric acid.

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“…Metal-oxide interface, a phase boundary formed by strong bonding interaction between metal and oxide crystallites, is a region of special catalytic activity in heterogeneous supported metal catalysis [1][2][3][4]. Experimental (STM, XPS, UPS, EELS and STEM) and theoretical (DFT) studies have demonstrated a number of interfacial effect including charge transfer, cluster stabilisation and decoration/encapsulation of metal nanoparticles on oxide supported metal catalysis [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%