Near ambient pressure XPS investigation of the interaction of ethanol with Co/CeO2(111)

Óvári, László; Calderón, Sandra Krick; Lykhach, Yaroslava; Libuda, Jörg; Erdöhelyi, András; Papp, Christian; Kiss, János; Steinrück, Hans‐Peter

doi:10.1016/j.jcat.2013.07.015

Cited by 114 publications

(48 citation statements)

References 55 publications

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“…Cobalt-based catalysts are widely used in the reaction of CO and H 2 to form linear aliphatic hydrocarbons with a broad molecular weight distribution [269]. Recently, cobalt (which is less expensive than noble metals) was found to be an excellent catalyst for ethanol transformation to produce hydrogen as an alternative energy carrier [270,271]. The low temperature decomposition of metal carbonyls is an elegant way to produce metal nanoparticles on substrates [272][273][274] (comparable similar methods are photo-induced [275] and electronassisted [276][277][278][279] metal-CO bond cleavage in carbonyl compounds).…”

Section: Formation and Stabilization Of Comentioning

confidence: 99%

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

Kukovecz

Kordás

Kiss

2016

Surface Science Reports

102

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Titanates are salts of polytitanic acid that can be synthesized as nanostructures in a great variety concerning crystallinity, morphology, size, metal content and surface chemistry.Titanate nanotubes (open-ended hollow cylinders measuring up to 200 nm in length and 15 nm in outer diameter) and nanowires (solid, elongated rectangular blocks with length up to 1500 nm and 30-60 nm diameter) are the most widespread representatives of the titanate nanomaterial family. This review covers the properties and applications of these two materials from the surface science point of view. Dielectric, vibrational, electron and X-ray spectroscopic results are comprehensively discussed first, then surface modification methods including covalent functionalization, ion exchange and metal loading are covered. The versatile surface chemistry of onedimensional titanates renders them excellent candidates for heterogeneous catalytic, photocatalytic, photovoltaic and energy storage applications, therefore, these fields are also reviewed.

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Section: Formation and Stabilization Of Comentioning

confidence: 99%

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

Kukovecz

Kordás

Kiss

2016

Surface Science Reports

102

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“…These observations led to the outstanding attention on the catalytic properties of the Co/ceria system in ethanol transformation reactions, including SRE. 12,[17][18][19][20][21][22][23][24][25][26][27][28] Very recently we have found that trace amounts of Rh promoter (0.1 wt%-0.17 mol%) dramatically altered the reaction pathways of SRE on Co/ceria catalysts. In contrast to Co/ceria, on rhodium-containing Co/ceria catalysts no acetone was observed.…”

Section: +mentioning

confidence: 99%

“…Upon reduction at 773 K, the intensity of the Co peak decreased and only a small new peak characteristic of metallic Co developed at 777.8 eV; this indicates that Co is difficult to reduce at this temperature. 21,24,28,29 The overall intensity decrease may be attributed to the dissolution in ceria and encapsulation of cobalt clusters by the support. Agglomeration or coalescence did not play a significant role, because the Co XP peaks gained intensity when the sample temperature was increased in stepwise manner after evacuation in a nitrogen atmosphere ( Fig.…”

Section: X-ray Photoelectron Spectroscopymentioning

confidence: 99%

Probing the interaction of Rh, Co and bimetallic Rh–Co nanoparticles with the CeO₂ support: catalytic materials for alternative energy generation

Varga

Pusztai

Óvári³

et al. 2015

Phys. Chem. Chem. Phys.

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The interaction of CeO 2 -supported Rh, Co and bimetallic Rh-Co nanoparticles, which are active catalysts in hydrogen production via steam reforming of ethanol, a process related to renewable energy generation, was studied by X-ray diffraction (XRD), high resolution electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS) and low energy ion scattering (LEIS). Furthermore, diffuse reflectance infrared spectroscopy (DRIFTS) of adsorbed CO as a probe molecule was used to characterize the morphology of metal particles. At small loadings (0.1%), Rh is in a much dispersed state on ceria, while at higher contents (1-5%), Rh forms 2-8 nm particles. Between 473-673 K pronounced oxygen transfer from ceria to Rh is observed and at 773 K significant agglomeration of Rh occurs. On reduced ceria, XPS indicates a possible electron transfer from Rh to ceria. The formation of smaller ceria crystallites upon loading with Co was concluded from XRD and HRTEM; for 10% Co, the CeO 2 particle size decreased from 27.6 to 10.7 nm. A strong dissolution of Co into ceria and a certain extent of encapsulation by ceria were deduced by XRD, XPS and LEIS. In the bimetallic system, the presence of Rh enhances the reduction of cobalt and ceria.During thermal treatments, reoxidation of Co occurs, and Rh agglomeration as well as oxygen migration from ceria to Rh are hindered in the presence of cobalt.

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“…Even in the A careful analysis of C 1s spectra revealed the coexistence of various carbon-like species at the surface of both measured fresh catalysts (see Table 3). However, it is not possible to discuss the presence of carbonates using the XPS spectra as it is known that the BE position of carbon in carbonate species (COOH) is within the range of 288.4 to 290 eV and it is overlapped with the broad Ce 4s peak of 289.4 to 289.7 eV [31][32][33]. It is interesting to note that the total amount of C in the less active Au1YCeCP catalyst used in CBO is considerably higher than in the corresponding Au1YCeIM sample (25.4 and 9.6 at.…”

Section: Sample Characterizationmentioning

confidence: 99%

Gold Catalysts on Y-Doped Ceria Supports for Complete Benzene Oxidation

et al. 2016

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Gold (3 wt. %) catalysts on Y-doped (1, 2.5, 5 and 7.5 wt. % Y 2 O 3 ) ceria supports prepared by coprecipitation (CP) or impregnation (IM) were studied in complete benzene oxidation (CBO). A low-extent Y modification was chosen to avoid ordering of oxygen vacancies. The samples were characterized by XRD, TGA, XPS and TPR techniques. A positive role of air pretreatment at 350˝C as compared to 200˝C was established for all Y-containing catalysts and it was explained by cleaning the active sites from carbonates. The oxygen supply cannot be considered as a limiting step for benzene oxidation except for the high 7.5%-doped samples, as suggested by TGA and TPR data. On the basis of XPS results of fresh and used in CBO catalysts, the presence of cationic gold species does not seem important for high CBO activity. The gold catalyst on an IM support with 1% Y-doping exhibited the best performance. A 100% benzene conversion was achieved only over this catalyst and Au/ceria, while it was not reached even at 300˝C over all other studied catalysts. Gold and ceria particle agglomeration or coke formation should be excluded as a possible reason, and the most probable explanation could be associated with the importance of the benzene activation stage.

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Near ambient pressure XPS investigation of the interaction of ethanol with Co/CeO2(111)

Cited by 114 publications

References 55 publications

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

Probing the interaction of Rh, Co and bimetallic Rh–Co nanoparticles with the CeO₂ support: catalytic materials for alternative energy generation

Gold Catalysts on Y-Doped Ceria Supports for Complete Benzene Oxidation

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Near ambient pressure XPS investigation of the interaction of ethanol with Co/CeO2(111)

Cited by 114 publications

References 55 publications

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

Probing the interaction of Rh, Co and bimetallic Rh–Co nanoparticles with the CeO2 support: catalytic materials for alternative energy generation

Gold Catalysts on Y-Doped Ceria Supports for Complete Benzene Oxidation

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Probing the interaction of Rh, Co and bimetallic Rh–Co nanoparticles with the CeO₂ support: catalytic materials for alternative energy generation