Competitive reaction of methylcyclohexane and n-hexane over alumina-supported platinum, iridium and ruthenium catalysts

Walter, Christian; Coq, Bernard; Figuéras, F.; Boulet, Marc

doi:10.1016/0926-860x(95)00180-8

Cited by 36 publications

(28 citation statements)

References 13 publications

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“…As for ruthenium(III) acetylacetonate, it can be considered as a promising precursor for the synthesis of heterogeneous ruthenium catalysts that are active in isomerizations and hydrogenations as well as hydrogenolysis of hydrocarbons. The main advantage is the possibility of the complete removal of acetylacetonate ligands under mild conditions which ensures the formation of a pure ruthenium metallic or oxidic phase and prevents its sintering [19][20][21][22], which is in agreement with our results.…”

Section: Selectivitysupporting

confidence: 93%

Influence of ruthenium precursor on catalytic activity of Ru/Al2O3 catalyst in selective isomerization of linoleic acid to cis-9,trans-11- and trans-10,cis-12-conjugated linoleic acid

Bernas

Kumar

Laukkanen

et al. 2004

Applied Catalysis A: General

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Section: Selectivitysupporting

confidence: 93%

Influence of ruthenium precursor on catalytic activity of Ru/Al2O3 catalyst in selective isomerization of linoleic acid to cis-9,trans-11- and trans-10,cis-12-conjugated linoleic acid

Bernas

Kumar

Laukkanen

et al. 2004

Applied Catalysis A: General

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“…[7][8][9][10][11][12] For example, McVicker et al 12 studied the selective rupture of naphthenic rings (methylcyclopentane (MCP), methylcyclohexane (MCH), 1,1-, 1,2-and 1,3-dimethylcyclopentane (1,1-DMCP, 1,2-DMCP and 1,3-DMCP), pentylcyclopentane (PCP) and ethylcyclopentane (ECP)) on Pt/SiO 2 , Pt/Al 2 O 3 , Ni/Al 2 O 3 , Ru/Al 2 O 3 , Rh/Al 2 O 3 and Ir/Al 2 O 3 . Among the mentioned catalysts, Ir/Al 2 O 3 presented the best activity and selectivity for cleavage of non-substituted C-C in five-membered naphthenic rings as MCH and PCP.…”

Section: Introductionmentioning

confidence: 99%

Iridium Catalysts for C-C and C-O Hydrogenolysis: Catalytic Consequences of Iridium Sites

Pamphile-Adrián¹,

Florez-Rodriguez²,

Passos³

2015

Journal of the Brazilian Chemical Society

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The support effect on the properties of iridium catalysts for C-C and C-O hydrogenolysis was investigated. Cyclohexane conversion and glycerol hydrogenolysis were used to compare the behavior of iridium catalysts in terms of C-C and C-O cleavage. The nature of the support influenced the catalyst performance in both cyclohexane conversion and glycerol hydrogenolysis. This effect was more evident on the product selectivity. Ir/SiO 2 catalyst presented the highest cyclohexane hydrogenolysis activity and the highest selectivity to minor hydrocarbons formed from hexane re-adsorption. For glycerol hydrogenolysis, all catalysts displayed a higher selectivity to products formed by C-O cleavage, mainly 1,2-propanediol (1,2-PDO). Ir/ZrO 2 catalyst presented the highest activity in all reaction conditions and the lowest selectivity to minor alcohols produced by C-C cleavage like methanol, ethanol and ethylene glycol. The results were explained in terms of the requirements and the structure of the catalytic sites.

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“…One of the most typical methods of C−C bond cleavage of heavy hydrocarbons is the use of metal–acid bifunctional catalysts such as Pt/zeolite and Pt/SiO 2 –Al 2 O 3 . Monofunctional metal catalysts have also been tested for C−C bond cleavage by hydrogenolysis, and the most typical catalyst of this type is Ir/SiO 2 . Recently, we have discovered that a highly dispersed Ru/CeO 2 catalyst is effective in regioselective hydrogenolysis of squalane (2,6,10,15,19,23‐hexamethyltetracosane), which is the total hydrogenation product of squalene .…”

Section: Introductionmentioning

confidence: 99%

“…catalysts have also been tested for CÀCb ond cleavage by hydrogenolysis, and the most typical catalyst of this typei sI r/SiO 2 . [42][43][44] Recently,w eh aved iscovered that ah ighly dispersed Ru/CeO 2 catalyst is effective in regioselective hydrogenolysis of squalane (2,6,10,15,19,23-hexamethyltetracosane), whichi st he total hydrogenation product of squalene. [45,46] The CÀCb onds between secondary carbon atoms were regioselectively cleaved without significant isomerization of the carbon chain over Ru/CeO 2 .T his Ru/ CeO 2 -catalyzed reactionp roduced branched hydrocarbonsf rom squalane, and good yields of af raction suitable to jet fuel (% C15, very low freezing point) were obtained.T he Ru/SiO 2 catalysta lso showed good CÀCh ydrogenolysis activity;h owever, the regioselectivity was lower.R uc atalysts showed hydrogenolysis activity at much lower temperature ( % 513 K) than Ir/SiO 2 (typically 593 K).…”

Section: Introductionmentioning

confidence: 99%

Production of Gasoline Fuel from Alga‐Derived Botryococcene by Hydrogenolysis over Ceria‐Supported Ruthenium Catalyst

et al. 2017

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Hydrogenolysis of hydrogenated botryococcene (Hy‐Bot) was conducted over various supported Ru catalysts, Ir/SiO2, and Pt/SiO2–Al2O3. Ru/CeO2 with very high dispersion showed the highest yield (70 %) of gasoline‐range (C5–C12) alkanes at 513 K. The main gasoline‐range products were dimethylalkanes. This yield is comparable to or higher than the gasoline yields from botryococcene in the literature, which were obtained at much higher temperature. Ir/SiO2 also showed a high fuel yield, but the activity was much lower than that with the Ru catalysts. The reaction over Pt/SiO2–Al2O3 slowed down before total conversion of Hy‐Bot was achieved. Ru/CeO2 was stable in the hydrogenolysis of Hy‐Bot without loss of activity and selectivity during reuses. The carbon balance was low for the hydrogenolysis of Hy‐Bot over all catalysts if the main products are heavy hydrocarbons, whereas for the hydrogenolysis of squalane the carbon balance was kept near 100 %. 1H NMR spectra of the product mixture and thermogravimetric analyses of the product mixture and the recovered catalyst revealed that the formation of aromatic compounds, polymeric products, and coke was negligible for the carbon balance. In a model reaction using substrate compounds with a substructure of Hy‐Bot, only 2,5‐dimethylhexane, which has a C6 chain with two Cprimary−Ctertiary bonds, produced a cyclic product, 1,4‐dimethylcyclohexane, which has a higher boiling point than the substrate. This dehydrocyclization reaction makes the product distribution in the hydrogenolysis of Hy‐Bot more complex.

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Competitive reaction of methylcyclohexane and n-hexane over alumina-supported platinum, iridium and ruthenium catalysts

Cited by 36 publications

References 13 publications

Influence of ruthenium precursor on catalytic activity of Ru/Al2O3 catalyst in selective isomerization of linoleic acid to cis-9,trans-11- and trans-10,cis-12-conjugated linoleic acid

Influence of ruthenium precursor on catalytic activity of Ru/Al2O3 catalyst in selective isomerization of linoleic acid to cis-9,trans-11- and trans-10,cis-12-conjugated linoleic acid

Iridium Catalysts for C-C and C-O Hydrogenolysis: Catalytic Consequences of Iridium Sites

Production of Gasoline Fuel from Alga‐Derived Botryococcene by Hydrogenolysis over Ceria‐Supported Ruthenium Catalyst

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