ChemInform Abstract: INFLUENCE OF SUPPORT ACIDITY AND CERIUM(3+) ADDITIVES ON THE REACTIVITY OF NICKEL PARTICLES HIGHLY DISPERSED ON VARIOUS OXIDE SUPPORTS

Sauvion, G.N.; Tempere, J. F.; Guilleux, M. F.; Djéga‐Mariadassou, Gérald; Delafosse, D.

doi:10.1002/chin.198539024

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“…The respective amounts of the mixed oxide and of HPA influence also the n-hexane reaction activities. For the nickel-based mixed oxide, the optimal amount of NiCe is 30% (table 4a), which does not corresponds exactly to the higher value of DC6 obtained while for the Pd-based oxide, the best mixture is constituted of 50% of Pd 0.1 CeO (table 4b) [24]. In our reactions conditions, the main reaction products are methyl pentanes (MP) and dimethyl butanes (DMB).…”

Section: Resultsmentioning

confidence: 79%

Mechanical mixtures of Me (Ni, Pd) Ce oxides and silica-supported heteropolyacids: Role and optimal concentration of each active species in n-hexane isomerization

Hubaut¹,

Tayeb

Kuang

et al. 2006

Kinet Catal

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-Catalytic properties of silica-supported heteropolyacids (HPA) in a mechanical mixture with reduced Me-Ce oxides (Me=Ni, Pd) in n-hexane isomerization are studied. The role of each component of the mixed oxides (Ce and, typically Ni and Pd) ,and their optimum content were enlightened; cerium, not only is beneficial for eliminating or prevent, the coke deposition but is also effective for maintaining the Keggin structure of the highly-organized HPA during the reaction and, probably allows a better dispersion of the second metal species. Nickel and palladium, present as Ni 0 and Pd 0 reinforce the activation of the alkane which is difficult to obtain by directly attacking by an acid and, thus, enhance noticeably the activity of the catalyst. The best mechanical mixtures are obtained with 30-70 wt % NiCeO-HPW/SiO 2 and 50-50 wt % Pd 0.1 CeO-HPW/SiO 2 .These mixtures have the highest efficiency for a Ni/Ni+W atomic ratio of 0.66 and a Pd/Pd+W ratio of 0.40 respectively. At last the conversion of n-hexane is in the order: HPW>HSiW>HBW which seems consistent with the order of their acid strength as claimed in the literature, but the isomerization selectivity appears slightly higher on HSiW.

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Section: Resultsmentioning

confidence: 79%

Mechanical mixtures of Me (Ni, Pd) Ce oxides and silica-supported heteropolyacids: Role and optimal concentration of each active species in n-hexane isomerization

Hubaut¹,

Tayeb

Kuang

et al. 2006

Kinet Catal

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ChemInform Abstract: INFLUENCE OF SUPPORT ACIDITY AND CERIUM(3+) ADDITIVES ON THE REACTIVITY OF NICKEL PARTICLES HIGHLY DISPERSED ON VARIOUS OXIDE SUPPORTS

Abstract: Die katalytischen Eigenschaften von feinverteiltem Ni‐Metall auf nicht reduzierbaren oxidischen Trägern wie Zeolithen Xund Aoder SiO2 lassen sich durch die Acidität des Trägers oder durch Ce3 ‐Additive modifizieren.

Cited by 1 publication

References 1 publication

Mechanical mixtures of Me (Ni, Pd) Ce oxides and silica-supported heteropolyacids: Role and optimal concentration of each active species in n-hexane isomerization

Mechanical mixtures of Me (Ni, Pd) Ce oxides and silica-supported heteropolyacids: Role and optimal concentration of each active species in n-hexane isomerization

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