Gold catalysis in Southern Italy

Liotta, Leonarda F.; Carlo, Gabriella Di; Pantaleo, G.; Deganello, G.; Venezia, Am

doi:10.1007/bf03214911

Cited by 66 publications

(139 citation statements)

References 41 publications

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“…The catalytic data for the Co series and Co30Ce samples herein described are in good agreement with our previous results 20,21 For methane oxidation on cobalt oxide-based catalysts, a number of parameters, such as the crystallite size, specific surface area, reducibility of the cobalt species, nature of the support and the cobalt content on the surface, are thought to influence the catalytic activity. 20,21,53 In Fig.…”

Section: Methane Oxidation Testssupporting

confidence: 90%

“…For the mixed valence Co 3 O 4 a spin-orbit splitting value of View Article Online 15.2 eV has been reported. 18,20,45 Here the spin-orbit value is 15.0 ± 0.1 eV close to that of Co 3 O 4 . Moreover, the shake-up satellite with a low intensity at ca.…”

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 76%

“…20,21,53 In Fig. 11a-b showing relatively low activity and performing similarly, the activity of bare Co 3 O 4 and Co30Ce oxides precipitated with the same agent significantly differed as a function of the calcination temperature and Co/Ce surface atomic ratio.…”

Section: Methane Oxidation Testsmentioning

confidence: 87%

“…This high percentage of Ce 3+ , which was not induced by X-ray exposure as determined by recording the spectra after different exposure time, is indicative of high oxygen vacancy content likely related to the peculiar nanocrystalline structure. 20 …”

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 99%

“…8,[16][17][18][19] We have reported that Co 3 O 4 -CeO 2 coprecipitated oxides are effective catalysts for methane oxidation in the presence of a stoichiometric oxygen concentration and the best activity was attained at a Co/Ce atomic ratio of~1. 20,21 In this sample, the presence of highly dispersed performance. High lattice oxygen mobility and formation of surface anionic vacancies in such a Co 3 O 4 -CeO 2 system were also relevant to propene and toluene oxidation activity.…”

Section: Introductionmentioning

confidence: 97%

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Co₃O₄ particles grown over nanocrystalline CeO₂: influence of precipitation agents and calcination temperature on the catalytic activity for methane oxidation

Pantaleo

Carlo

et al. 2015

Catal. Sci. Technol.

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aCrystalline cobalt oxides were prepared by a precipitation method using three different precipitation agents, ĲNH 4 ) 2 CO 3 , Na 2 CO 3 and COĲNH 2 ) 2 . Cobalt oxide nanoparticles corresponding to a Co 3 O 4 loading of 30 wt% were also deposited over high-surface area nanocrystalline ceria by the same precipitation agents. The effect of calcination temperature, 350 or 650°C, on the morphological and structural properties was evaluated. Characterization by BET, XRD, SEM, TEM, Raman spectroscopy, H 2 -TPR, XPS and NH 3 -TPD was performed and the catalytic properties were explored in the methane oxidation reaction. The nature of the precipitation agent strongly influenced the textural properties of Co 3 O 4 and the Co 3 O 4 -CeO 2 interface. The best control of the particle size was achieved by using COĲNH 2 ) 2 that produced small and regular crystallites of Co 3 O 4 homogeneously deposited over the CeO 2 surface. Such a Co 3 O 4 -CeO 2 system precipitated by urea showed enhanced low-temperature reducibility and high surface Co 3+ concentration, which were identified as the key factors for promoting methane oxidation at low temperature. Moreover, the synergic effect of cobalt oxide and nanocrystalline ceria produced stable full conversion of methane in the entire range of investigated temperature, up to 700-800°C, at which Co 3 O 4 deactivation usually occurs.

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Section: Methane Oxidation Testssupporting

confidence: 90%

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 76%

Section: Methane Oxidation Testsmentioning

confidence: 87%

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Co₃O₄ particles grown over nanocrystalline CeO₂: influence of precipitation agents and calcination temperature on the catalytic activity for methane oxidation

Pantaleo

Carlo

et al. 2015

Catal. Sci. Technol.

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The Interplay between Structure and Product Selectivity of CO₂ Hydrogenation

et al. 2019

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Identification of the active structure under reaction conditions is of great importance for the rational design of heterogeneous catalysts. However, this is often hampered by their structural complexity. The interplay between the surface structure of Co3O4 and the CO2 hydrogenation is described. Co3O4 with morphology‐dependent crystallographic surfaces presents different reducibility and formation energy of oxygen vacancies, thus resulting in distinct steady‐state composition and product selectivity. Co3O4‐0 h rhombic dodecahedra were completely reduced to Co0 and CoO, which presents circa 85 % CH4 selectivity. In contrast, Co3O4‐2 h nanorods were partially reduced to CoO, which exhibits a circa 95 % CO selectivity. The crucial role of the Co3O4 structure in determining the catalytic performance for higher alcohol synthesis over CuCo‐based catalysts is demonstrated. As expected, Cu/Co3O4‐2 h shows nine‐fold higher ethanol yield than Cu/Co3O4‐0 h owing to the inhibition for methanation.

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Promotional Role of Surface Defects on Carbon‐Supported Ruthenium‐Based Catalysts in the Transfer Hydrogenation of Furfural

et al. 2016

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The synthesis of highly efficient supported metal catalysts is of vital importance for the modern development of the production of chemicals. In this regard, biomass‐based chemical transformation holds potential promise through many heterogeneous catalytic processes. Herein, we report surface defect engineering on a carbon‐supported, Ru‐based catalyst by a two‐step hybridization–self‐reduction route, which involves the assembly of a hybrid composite of ternary Co‐Al‐Ru layered double hydroxide (CoAlRu‐LDH) and amorphous carbon through the carbonization of glucose and a subsequent in situ self‐reduction process. The results revealed that Ru3+ species in the resulting CoAlRu‐LDH‐C composite could be reduced in situ to Ru0 species by the carbon component in the hybrid composite, and Co‐containing spinels with a large quantity of surface oxygen vacancies could be formed simultaneously on the surface. The as‐fabricated Ru‐based catalyst showed a superior catalytic performance in the liquid‐phase transfer hydrogenation of furfural to furfuryl alcohol using benzyl alcohol as hydrogen donator to other Ru‐based catalysts derived from LDH‐C composite precursors. It was proven that surface defects (i.e., oxygen vacancies, Co2+ species) could enable the chemisorption of furfural spatially and ensure the activation of its carbonyl groups, which promoted the transfer hydrogenation greatly.

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Gold catalysis in Southern Italy

Cited by 66 publications

References 41 publications

Co₃O₄ particles grown over nanocrystalline CeO₂: influence of precipitation agents and calcination temperature on the catalytic activity for methane oxidation

Co₃O₄ particles grown over nanocrystalline CeO₂: influence of precipitation agents and calcination temperature on the catalytic activity for methane oxidation

The Interplay between Structure and Product Selectivity of CO₂ Hydrogenation

Promotional Role of Surface Defects on Carbon‐Supported Ruthenium‐Based Catalysts in the Transfer Hydrogenation of Furfural

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Gold catalysis in Southern Italy

Cited by 66 publications

References 41 publications

Co3O4 particles grown over nanocrystalline CeO2: influence of precipitation agents and calcination temperature on the catalytic activity for methane oxidation

Co3O4 particles grown over nanocrystalline CeO2: influence of precipitation agents and calcination temperature on the catalytic activity for methane oxidation

The Interplay between Structure and Product Selectivity of CO2 Hydrogenation

Promotional Role of Surface Defects on Carbon‐Supported Ruthenium‐Based Catalysts in the Transfer Hydrogenation of Furfural

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Co₃O₄ particles grown over nanocrystalline CeO₂: influence of precipitation agents and calcination temperature on the catalytic activity for methane oxidation

Co₃O₄ particles grown over nanocrystalline CeO₂: influence of precipitation agents and calcination temperature on the catalytic activity for methane oxidation

The Interplay between Structure and Product Selectivity of CO₂ Hydrogenation