Characterization of Ni/SiO2 Catalysts Prepared by Successive Deposition and Reduction of Ni2+ Ions

Hadjiivanov, Konstantin; Mihaylov, Mihail; Klissurski, D.; Stefanov, P.; Abadjieva, N.; Vassileva, Emilia; Mintchev, L.

doi:10.1006/jcat.1999.2521

Cited by 175 publications

(136 citation statements)

References 44 publications

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“…On the monometallic Ni sample, the observed band at 2132 cm − 1 is attributed to CO polarized by Ni +2 ions [50]. The observed bands at 2056 and 2037 cm − 1 can be related to CO linearly bonded to the Ni surface [51] in agreement with Blackmond and Ko [52].…”

Section: Ftir Of Adsorbed Cosupporting

confidence: 82%

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Influence of copper on nickel-based catalysts in the conversion of glycerol

Miranda

Chimentão

Szanyi

et al. 2015

Applied Catalysis B: Environmental

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The catalytic transformation of glycerol to value-added compounds was investigated over bimetallic Ni-Cu/y-Al2 O3 catalysts with Ni/Cu atomic ratios of 8/1, 4/1, 2/1, 1/1, 1/2, 1/4, and 1/8. XPS analysis revealed that the surface composition of the catalyst exhibited progressive enrichment of Cu as its content in the catalyst increased. H2 -chemisorption indicated that the total number of exposed Ni atoms decreased as the Cu content increased. As a result, deep hydrogenolysis to produce CH4 was inhibited by the addition of Cu to the Ni catalyst, yielding higher selectivity toward the dehydration products of glycerol such as hydroxyacetone.FTIR spectra of adsorbed CO reveal that Cu asserts both geometric and electronic effects on the adsorption properties of Ni. The geometrical effect is visualized by the progressive disappearance of the bridge-bound adsorbed CO on metallic Ni by the incorporation of Cu. This suggests that the deep hydrogenolysis of glycerol to CH4 formation requires an ensemble of adjacent active Ni atoms. The electronic effect of Cu on Ni is indicated by the red shift of the IR peak of adsorbed CO as the Cu content increases. The electronic interaction between Cu and Ni species was also substantiated by XANES results. HTREM revealed metal particles very well distributed on the support with particle size of 1.5 to 5 nm. The Ni-Cu samples were not a total intermetallic alloys..

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Section: Ftir Of Adsorbed Cosupporting

confidence: 82%

“…In general, adsorption of CO at RT on metallic Ni can be divided into two groups: (i) reversible and (ii) irreversible adsorbed. The irreversible adsorption is attributed to two different species: linear and bridge-bound CO [50]. The high frequency band at 2100-2000 cm − 1 can be assigned to linearly adsorbed CO on metallic Ni.…”

Section: Ftir Of Adsorbed Comentioning

confidence: 95%

Influence of copper on nickel-based catalysts in the conversion of glycerol

Miranda

Chimentão

Szanyi

et al. 2015

Applied Catalysis B: Environmental

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“…The NiO crystallites supported on ZrO2 were reduced at approximately 673 K, which was nearly the same as that for the unsupported NiO. Ni/SiO2 also provided a peak maximum at the same temperature, but H2 consumption continued beyond 900 K. The higher-temperature peak is likely due to the reduction of Ni 2 ions from surface nickel philosilicates 23) . Ni/CeO2 was reduced at approximately 100 K lower than NiO, indicating that CeO2 promoted the reduction of NiO to the metal.…”

Section: E F F E C T O F T H E S U P P O R T O N S R E O V E R N Imentioning

confidence: 58%

Effects of Metal Oxide Support and Non-noble Metal Active Species on Catalytic Steam Reforming of Ethanol for Hydrogen Production

Saeki

Ohkita

Kakuta

et al. 2015

J. Jpn. Petrol. Inst.

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Dependence of hydrogen production via the catalytic steam reforming of ethanol on the metal oxide support and first row transition metal catalyst was investigated. Ni supported on CeO2 was more easily reduced and began to produce hydrogen at a lower temperature than Ni supported on ZrO2, SiO2, Al2O3, and MgO. Ni/CeO2 also maintained a high activity at a constant reaction temperature of 673 K and inhibited carbon deposition. Therefore, CeO2 was adopted as the catalytic support. Compared with Ni/CeO2, Fe/CeO2 and Mn/CeO2 were less active. Contrarily, Co/CeO2 was slightly less active at 673 K, but exhibited a comparable hydrogen yield at 873 K. The Cu/CeO2 system was reduced more readily and produced hydrogen at a lower temperature, but its activity gradually deteriorated by carbon deposition. Thus we concluded that Ni/CeO2 exhibited the best combination of properties with the highest hydrogen yield at 673 K and a long stability.

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“…Ni/SiO 2 shows a peak consisting of two components with maxima at 400 and 420 o C. This evidences some inhomogeneity of supported Ni. According to the data from the literature, 16 the TPR peaks are due to the reduction of NiO. No strong metal to support interaction (SMSI) is typical with silica.…”

Section: Resultsmentioning

confidence: 97%

Partial Oxidation of Methane over Ni/SiO₂

Roh

Dong

Jun

et al. 2002

Bulletin of the Korean Chemical Society

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Ni catalyst (Ni: 15 wt%) supported on precalcined SiO2 has been investigated in reforming reactions of methane to synthesis gas. The catalyst exhibited fairly good activity and stability in partial oxidation of methane (POM), whereas it deactivated in steam reforming of methane (SRM). Pulse reaction results of CH4, O2, and CH4/O2 revealed that Ni/SiO2 has high capability to dissociate methane. The results also revealed that both CH4 and O2 are activated on the surface of metallic Ni, and then surface carbon species react with adsorbed oxygen to produce CO and CO2 depending on the bond strength of the oxygen species on the catalyst surface.

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Characterization of Ni/SiO2 Catalysts Prepared by Successive Deposition and Reduction of Ni2+ Ions

Cited by 175 publications

References 44 publications

Influence of copper on nickel-based catalysts in the conversion of glycerol

Influence of copper on nickel-based catalysts in the conversion of glycerol

Effects of Metal Oxide Support and Non-noble Metal Active Species on Catalytic Steam Reforming of Ethanol for Hydrogen Production

Partial Oxidation of Methane over Ni/SiO₂

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Characterization of Ni/SiO2 Catalysts Prepared by Successive Deposition and Reduction of Ni2+ Ions

Cited by 175 publications

References 44 publications

Influence of copper on nickel-based catalysts in the conversion of glycerol

Influence of copper on nickel-based catalysts in the conversion of glycerol

Effects of Metal Oxide Support and Non-noble Metal Active Species on Catalytic Steam Reforming of Ethanol for Hydrogen Production

Partial Oxidation of Methane over Ni/SiO2

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Product

Resources

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Partial Oxidation of Methane over Ni/SiO₂