Study of the Ru/Ce system in the oxidation of carbon black and volatile organic compounds

Aouad, Samer; Saab, Elias; Abi‐Aad, Edmond; Aboukaı̈s, Antoine

doi:10.1134/s0023158407060122

Cited by 34 publications

(16 citation statements)

References 14 publications

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“…The spectrum contains two anisotropic signals: a more intense ''S 1 '' signal and a new signal that we named ''S 2 '' with g' xx = 1.8304, g' yy = 1.9251 and g' zz = 2.0458. This ''S 2 '' signal is the same as the one we obtained in [15] following vacuum treatment. The two different ''S 1 '' and ''S 2 '' ESR signals are due to the presence of paramagnetic Ru 3?…”

Section: Resultssupporting

confidence: 69%

“…An anisotropic signal (subsequently called ''S 1 '') with g xx = 1.8924, g yy = 1.9479 and g zz = 2.0846 is observed. This signal is different from the one obtained in our previous work for the same catalyst following heating under vacuum [15]. Therefore, another Ru5Ce sample was ; cooling to room temperature; degassing to 5 9 10 -4 mbar; reactivation at 200°C for 1 h under pure oxygen (400 mbar) in order to re-oxidize ruthenium species that were reduced during water elimination.…”

Section: Resultsmentioning

confidence: 81%

“…Moreover, in our previous work [13][14][15], we have shown that such systems are very efficient and promising in oxidation reactions.…”

Section: Introductionmentioning

confidence: 96%

“…It is used for wet air oxidation of organic acids [9,10], alcohols [11,12] carbon monoxide, alcanes and soot oxidations [13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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ESR Investigation of Active Sites in Ru/CeO2 Solids

et al. 2016

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Two Ru/CeO 2 catalysts with Ru loadings of 1.65 and 5 wt% were prepared by wet impregnation. The adsorption of propylene or toluene led to two different ESR signals corresponding to two different catalytic sites. These two sites are present among the well dispersed ruthenium oxide species that reduce at *74°C. One site is un-reactive unless activated to remove adsorbed water while the second site is reactive at room temperature. Both sites are easily regenerated under oxidative atmosphere at 200°C. These two sites are optimally obtained for calcination temperatures in the 500-600°C interval and a Ru loading of 1.65 wt%. For Ru5Ce, the same reactive sites are present along with agglomerated ruthenium oxide species that are less reactive in oxidation reactions. Graphical Abstract2500 2750 3000 3250 3500 3750 4000 S 3

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Section: Resultssupporting

confidence: 69%

Section: Resultsmentioning

confidence: 81%

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ESR Investigation of Active Sites in Ru/CeO2 Solids

et al. 2016

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“…For the combustion of light alkanes, palladium and platinum-based catalysts are recognized as the most active noble metals [3,[10][11][12]. Up to now, only few researches have been focused on the application of ruthenium catalysts in the combustion of alkanes [13][14][15]. Only wet air oxidation of various pollutants on supported ruthenium catalysts has been well documented [16][17][18], but this method seems to be inappropriate for practical use since highly pressurized conditions (10-50 bar) are needed to oxidise VOCs at low temperature.…”

Section: Introductionmentioning

confidence: 99%

Influence of Catalyst Pretreatments on Propane Oxidation Over Ru/γ-Al2O3

Okal

Zawadzki

2009

Catal Lett

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The influence of different treatments (in H 2 or in O 2 at 250 or 600°C) of alumina supported Ru catalysts on the total oxidation of propane was investigated. Ruthenium catalysts were prepared using RuCl 3 as metal precursor and characterized by H 2 chemisorption, O 2 uptake, BET, XRD and TEM. The presence of chloride on the catalyst surface was found to exert an inhibiting effect on the activity of Ru. The reduced Ru/c-Al 2 O 3 catalysts after partial removing chlorine ions were more active than the same samples oxidized at 250°C. The higher activity of the reduced Ru/c-Al 2 O 3 catalysts was attributed to the presence of a large amount of active sites on small Ru x O y clusters without well defined stoichiometry or on a poorly ordered layer of a ruthenium oxide on the larger Ru particles. The formation of highly dispersed, but in some extent crystallized RuO 2 phase in catalysts oxidized at 250°C, leads to slightly lower activity of the Ru phase. Strong decline of the activity was found for catalysts oxidized at 600°C. At this temperature, the Ru particles were completely oxidized to well-crystallized RuO 2 oxide, and the mean crystallite size of the Ru oxide phase was much higher (9-25 nm) than that of after oxidation at 250°C (*4 nm). The effect of the regeneration treatment in H 2 on the activity of the Ru/cAl 2 O 3 catalysts was also studied. The active ruthenium species for propane oxidation were discussed based on the catalytic and characterization data both before and after activity tests.

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A Highly Selective and Stable Ruthenium‐Nickel Supported on Ceria Catalyst for Carbon Dioxide Methanation

et al. 2021

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The performance of nickel, ruthenium, and nickel‐ruthenium impregnated on cerium oxide catalysts was tested in the methanation of carbon dioxide reaction. The nickel and ruthenium contents were 4 and 0.4 wt%, respectively. The properties of the catalysts were studied using elementary analysis, Brunauer‐Emmet‐Teller specific surface area measurements, X‐ray diffraction, temperature programmed reduction, temperature programmed desorption, H2 chemisorption and transmission electron microscopy. The results showed that the addition of ruthenium improves the catalytic performance by promoting the dispersion of nickel species over the surface of the cerium oxide support. The ruthenium‐nickel combination produced a stable catalyst that did not show any deactivation even after 75 hours on‐stream. At high feed gas total pressures (5 and 10 bar), the catalytic conversions of CO2 were close to the thermodynamic equilibrium values with a 100 % selectivity towards CH4 formation.

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Study of the Ru/Ce system in the oxidation of carbon black and volatile organic compounds

Cited by 34 publications

References 14 publications

ESR Investigation of Active Sites in Ru/CeO2 Solids

ESR Investigation of Active Sites in Ru/CeO2 Solids

Influence of Catalyst Pretreatments on Propane Oxidation Over Ru/γ-Al2O3

A Highly Selective and Stable Ruthenium‐Nickel Supported on Ceria Catalyst for Carbon Dioxide Methanation

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