Ring opening of 1,2- and 1,3-dimethylcyclohexane on iridium catalysts

Phuong, T.; Alvarez, Walter E.; Resasco, Daniel E.

doi:10.1016/j.jcat.2005.12.021

Cited by 75 publications

(101 citation statements)

References 22 publications

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“…But these metals have higher activity and selectivity to cleave the bisecondary bonds of the C 5 -ring [2,3]. Furthermore it was shown by Resasco et al [19] that the dispersion of metal particles is less important for the reaction mechanism taking place by converting 1,2-and 1,3-dimethylcyclohexane over different Iridium catalyst. However, they showed the type of support influences the ring opening mechanism strongly.…”

Section: Introductionmentioning

confidence: 99%

Hydrogenation and Ring Opening of Aromatic and Naphthenic Hydrocarbons Over Noble Metal (Ir, Pt, Rh)/Al2O3 Catalysts

et al. 2012

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The hydrogenation and ring opening of model hydrocarbons and of naphtha was studied over commercial noble metal (Ir, Pt, Rh)/Al 2 O 3 catalysts. The experiments were performed in a fixed bed reactor at temperatures between 220 and 350°C and pressures of 1.1 and 5.0 MPa, respectively. The product distribution was determined and the cetane number was calculated. The Pt catalyst is very active for hydrogenation of aromatics but does not catalyse the ring opening of naphthenes. The Ir and Rh catalysts are active for both hydrogenation of aromatics and ring opening of naphthenes. Experiments with toluene, mxylene, propyl-benzene, and methylcyclohexane indicate that ring opening follows a selective mechanism, where the cleavage of bisecondary carbon bonds is favoured. This results in predominant formation of branched paraffins. The product distribution as well as cracking of long-chain hydrocarbons, which increase at temperatures above 260°C, lead to an insignificant boost in the cetane number, as confirmed by experiments using real naphtha as feedstock.

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Section: Introductionmentioning

confidence: 99%

Hydrogenation and Ring Opening of Aromatic and Naphthenic Hydrocarbons Over Noble Metal (Ir, Pt, Rh)/Al2O3 Catalysts

et al. 2012

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“…Meanwhile, literature showed that Ir catalysts have high activity and selectivity toward ring opening of C5 and C6 monocyclic molecules, but several reports show that C6 ring opening of molecule is enhanced by the use of bifunctional catalyst. 55,[58][59][60][61][62][63][64][65] This also followed the mechanism of the C6 to C5 contradiction on the acid site and the openings of the C5 ring on the metal site. 55 Ring opening of naphthenic molecule had been reported to occur via three distinct processes:…”

Section: -53mentioning

confidence: 89%

Catalytic Hydrogenation of Hydrocarbons for Gasoline Production

Garba¹,

Galadima²

2018

JPS

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“…More recent studies demonstrated that complete hydrotreating of the aromatics prior to ring opening was needed [22][23][24], and cis-decalin converts much more selectively to ring-opening products than trans-decalin [7]. Meanwhile, we noticed that complete hydrogenation of naphthalene could perform on noble-metal/zeolite catalysts even at low temperature [25], and high selectivity of cis-decalin could be obtained on Pt/Y compared with Pd/Y [26].…”

Section: Introductionmentioning

confidence: 86%

Coupled hydrogenation and ring opening of tetralin on potassium modified Pt/USY catalysts

Yang

Wen

et al. 2007

Catal Lett

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Coupled hydrogenation and ring opening of tetralin (THN) on Pt/USY catalyst were performed on a high-pressure fixed-bed reactor. The effect of reaction temperature in range of 100-300°C and the nature of the catalyst (metal and acid sites) on the catalytic performance were studied. The results indicated that the extent of hydrocracking, a sequential reaction of ring opening, should be reduced in order to maintain high yields of the ring opening products (ROP). Introduction of the Pt component accelerated the hydrogenation and ring opening of the THN significantly. It was also found to be an effective way to optimize the acid properties of the catalysts by introducing an appropriate amount of potassium to the catalyst, such that the strong acid sites of the catalysts were diminished, and a higher ROP yield could be obtained as a result of the inhibiting of the hydrocracking activity of the catalyst. When the yield of the C10 fractions could be maintained at 90 wt.%, then a maximal ROP yield of 35.6 wt.% could be obtained on a 0.5 wt.% Pt/USY catalyst loaded with 2.0 wt.% of K.

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Ring opening of 1,2- and 1,3-dimethylcyclohexane on iridium catalysts

Cited by 75 publications

References 22 publications

Hydrogenation and Ring Opening of Aromatic and Naphthenic Hydrocarbons Over Noble Metal (Ir, Pt, Rh)/Al2O3 Catalysts

Hydrogenation and Ring Opening of Aromatic and Naphthenic Hydrocarbons Over Noble Metal (Ir, Pt, Rh)/Al2O3 Catalysts

Catalytic Hydrogenation of Hydrocarbons for Gasoline Production

Coupled hydrogenation and ring opening of tetralin on potassium modified Pt/USY catalysts

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