The mechanisms of hydrogenolysis and isomerization of hydrocarbons on metalsII. Mechanisms of isomerization of hexanes on platinum catalysts

Barron, Y; Maire, G.; Muller, J.; Gault, F.G.

doi:10.1016/s0021-9517(66)80062-3

Cited by 106 publications

(30 citation statements)

References 7 publications

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“…Subsequent work by Anderson and Avery (1966) and by Boudart et al (1968) showed that neopentane was isomerized to isopentane over various forms of platinum catalysts. The isomerization of n-hexane (Barron et al, 1966) and n-heptane (Carter et aI., 1971) on monofunctional platinum catalysts has also been reported recently. These examples provide clear evidence of a metal catalyzed isomerization process which does not require the presence of a conventional acidic component in the catalyst.…”

Section: Isomerization Of Alkanesmentioning

confidence: 86%

Catalytic specificity

Sinfelt

1973

AIChE Journal

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SCOPECatalytic specificity refers to the particular ability of a substance or closely related group of substances to catalyze a given type of chemical transformation. Identifying the type of catalyst which is good for a particular reaction is a matter of great practical importance. In the area of heterogeneous catalysis, to which this review is limited, there are few, if any, examples where the factors determining catalytic specificity are understood in detail. However, much progress has been made in establishing patterns of variation in catalytic behavior from one substance to another for various types of reactions. In particular, broad relationships are often evident between the catalytic activity of an element or its compounds and the position of the element in the periodic table. These relationships introduce a measure of order into heterogeneous catalysis and will be useful in the development of a more fundamental understanding of the subject.The present review considers a variety of classes of reactions from the standpoint of assessing patterns of variation in behavior among catalysts. The types of reactions considered include hydrogenation, hydrogenolysis, isomerization, ammonia synthesis and decomposition, oxidation, and the decomposition of alcohols and organic acids. Relationships between catalytic activities and the chemisorption properties of reactants are discussed repeatedly. Both metal and oxide type catalysts are considered. However, most of the emphasis is on metals, for which more extensive data comparing specific catalytic activities are available.

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Section: Isomerization Of Alkanesmentioning

confidence: 86%

Catalytic specificity

Sinfelt

1973

AIChE Journal

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“…Light alkanes isomerize by a bond-shift mechanism, but hydrocarbons with chains longer than five carbon atoms can alternatively isomerize through a five or six member ring intermediate [19,20,[29][30][31]. Gault et al have used 13C labelled compounds to prove that for most platinum catalysts, this cyclic mechanism is predominant for heavy hydrocarbons isomerization [19,32].…”

Section: Djscussionmentioning

confidence: 99%

Methylcyclopentane conversion over platinum single crystal surfaces: Evidence for the cyclic mechanism of n-hexane isomerization

Zaera¹

1986

Journal of Catalysis

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“…When the support is non-acidic and the reaction is carried out at low temperature, hydrogenative "ring opening" prevails. The product distribution of this reaction depended on the nature of the metal [8], on its surface structure [9,10], on possible non-stoichiometric surface components [11,12], and also on the reaction conditions [13,14]. Kramer et al [15,16] attributed the "non-selective" ring opening to "adlineation sites" i.e.…”

Section: Introductionmentioning

confidence: 99%

Methylcyclopentane reactions on Rh-Ge/Al2O3 catalysts prepared by controlled surface reaction

Teschner

Piraúlt-Roy

Naud

et al. 2003

Applied Catalysis A: General

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The reaction mechanism of methylcyclopentane (MCP) ring opening on Rh catalysts (the participation of each intermediate in further hydrogenolysis vs. their desorption) was studied on a special series of Rh(Ge)/Al 2 O 3 catalysts. These were obtained by wet impregnation and adding different amounts of Ge by anchoring of Ge(n-C 4 H 9 ) 4 on the surface of Rh with preadsorbed hydrogen. As shown earlier [1], low amounts of Ge were deposited selectively on low-Miller-index microfacets, whereas excess use of Ge(n-C 4 H 9 ) 4 caused statistical deposition on Rh. This difference was also reflected in the ring-opening pattern: the sample with randomly located Ge behaved like the parent catalyst with dispersion of 80%. Each ring-opening intermediate hydrogenolyzed further nearly to the same extent; the ring opening product distribution (ROPD) showing thus no variation as a function of reaction conditions. The catalyst with selective Ge deposition followed, however, the pattern of a sintered sample: the surface intermediate of 2-methylpentane underwent preferential hydrogenolysis to smaller fragments. Thus, changing the position of Ge deposits (without modifying the particle size) induced changes in the prevailing reaction route.

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The mechanisms of hydrogenolysis and isomerization of hydrocarbons on metalsII. Mechanisms of isomerization of hexanes on platinum catalysts

Cited by 106 publications

References 7 publications

Catalytic specificity

Catalytic specificity

Methylcyclopentane conversion over platinum single crystal surfaces: Evidence for the cyclic mechanism of n-hexane isomerization

Methylcyclopentane reactions on Rh-Ge/Al2O3 catalysts prepared by controlled surface reaction

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