Active centers of platinum-silica catalysts in hydrogenolysis and isomerization of n-pentane

Brunelle, J.P.; Sugier, Annie; Page, Jean-François Le

doi:10.1016/0021-9517(76)90314-6

Cited by 70 publications

(12 citation statements)

References 18 publications

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“…These results are in line with the data published in the literature [47,48]. According to Namzek and Ryczkowski [47], the decrease of Pt particle size below 3 nm results in higher contribution of the products of hydrogenolysis in n-butane hydroconversion.…”

Section: The Influence Of Platinum Dispersionsupporting

confidence: 93%

“…The increase of platinum particle size above 3 nm leads to predominant isomerization. More detailed kinetic study performed by Brunelle et al [48] for hydroisomerization of n-pentane shows that the ratio V H /V I , where V H is a rate of hydrogenolysis and V I is a rate of isomerization, decreases by a factor of 10 when the platinum particle size increases from 0.7 to 15 nm [48].…”

Section: The Influence Of Platinum Dispersionmentioning

confidence: 97%

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Hydroisomerization of n-alkanes over Pt-modified micro/mesoporous materials obtained by mordenite recrystallization

Коннов

Ivanova

Пономарева

et al. 2012

Microporous and Mesoporous Materials

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Section: The Influence Of Platinum Dispersionsupporting

confidence: 93%

Section: The Influence Of Platinum Dispersionmentioning

confidence: 97%

Hydroisomerization of n-alkanes over Pt-modified micro/mesoporous materials obtained by mordenite recrystallization

Коннов

Ivanova

Пономарева

et al. 2012

Microporous and Mesoporous Materials

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“…In contrast, the Sn‐modified catalysts have a larger mean particle size (Figure 9 b–e), particularly for the two samples prepared by the co‐impregnation method, which is in agreement with the formation of surface Ni‐Sn alloys 26. 45 As to the surface Ni particle distribution, the two co‐impregnation samples also show a bimodal distribution, which indicates the presence of two major groups of large Ni particles. However, for the other three samples, monomodal distribution, which indicates the only presence of one group of large Ni particles, is detected.…”

Section: Resultssupporting

confidence: 72%

Tin Modification on Ni/Al₂O₃: Designing Potent Coke‐Resistant Catalysts for the Dry Reforming of Methane

Peng

Liu

et al. 2014

ChemCatChem

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Sn‐modified Ni/Al2O3 catalysts for CH4 dry reforming were prepared by co‐impregnation and two‐step impregnation methods and characterized by thermogravimetric analysis with differential scanning calorimetry, SEM, TEM, high‐angle annular dark‐field scanning transmission electron microscopy mapping, XRD, X‐ray photoelectron spectroscopy, H2 temperature‐programmed reduction, and CO2 temperature‐programmed desorption. After reduction, surface Ni‐Sn alloys were formed on the Ni particles, which changed the inherent activity of Ni sites and suppressed coking effectively with a mild loss of the activity. The catalysts with different amounts of surface Ni‐Sn alloys also provided strong evidence to prove that the coking rate and activity change tendency correlate well with the amount of the surface alloys. These results are of help to develop catalysts with potent resistance to coking for industrial use.

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“…The 2MP:3MP ratio of 3.5: 1 obtained by Barron et a1.l' for their 10% catalyst was attributed to a metal crystallite size of ca. 20…”

Section: Resultsmentioning

confidence: 99%

Effects of oxidation–reduction treatments of Pt/Al2O3 on catalytic activity and selectivity for hexane reforming

Anderson¹,

Mordente²,

Rochester³

1989

J. Chem. Soc., Faraday Trans. 1

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Consecutive oxidation-reduction cycles involving successive oxidation treatments of 0.3 % Pt/AI,O, at various temperatures, each followed by a reduction treatment in hydrogen to produce active catalyst, lead to changes in catalytic activity for the reactions of n-hexane with hydrogen. Decreased activity is paralleled by changes in selectivity brought about by the increased tendency of large platinum particles towards coking. Changes in selectivity are not observed where an increase in activity occurs. Results show that the reforming reactions of n-hexane can be used to gain information about the state of metal particles following sintering/redispersion of Pt on alumina.Catalytic reforming of hydrocarbons in industry currently involves a bimetallic or multimetallic catalyst containing from 0.2 to 0.75 YO platinum by weight, supported on chlorided alumina.' In order to counteract losses in catalytic activity and to maintain a desirable product distribution in the reformate, an increase in operating temperature with time is required. Regeneration of deactivated catalysts involves the oxidation of carbon-rich deposits, and redispersion of the metallic elements of the catalyst. The redispersion mechanism by oxychlorination is not fully understood, although oxygen and chlorine are essential requirements for the process. 2, A previous paper4 described the effect of the temperature of oxygen treatment during oxidation-reduction cycles on the dispersion of platinum supported on chlorided y-Al,03. Infrared spectroscopy was used to monitor CO adsorption, which gave an indication of changes in the dispersion of platinum during the cycle^.^ This paper reports the effect of corresponding oxidation-reduction cycles on the activity and selectivities5 for the reaction of n-hexane with hydrogen over chlorided Pt/A120,.

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Active centers of platinum-silica catalysts in hydrogenolysis and isomerization of n-pentane

Cited by 70 publications

References 18 publications

Hydroisomerization of n-alkanes over Pt-modified micro/mesoporous materials obtained by mordenite recrystallization

Hydroisomerization of n-alkanes over Pt-modified micro/mesoporous materials obtained by mordenite recrystallization

Tin Modification on Ni/Al₂O₃: Designing Potent Coke‐Resistant Catalysts for the Dry Reforming of Methane

Effects of oxidation–reduction treatments of Pt/Al2O3 on catalytic activity and selectivity for hexane reforming

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Active centers of platinum-silica catalysts in hydrogenolysis and isomerization of n-pentane

Cited by 70 publications

References 18 publications

Hydroisomerization of n-alkanes over Pt-modified micro/mesoporous materials obtained by mordenite recrystallization

Hydroisomerization of n-alkanes over Pt-modified micro/mesoporous materials obtained by mordenite recrystallization

Tin Modification on Ni/Al2O3: Designing Potent Coke‐Resistant Catalysts for the Dry Reforming of Methane

Effects of oxidation–reduction treatments of Pt/Al2O3 on catalytic activity and selectivity for hexane reforming

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Tin Modification on Ni/Al₂O₃: Designing Potent Coke‐Resistant Catalysts for the Dry Reforming of Methane