Ring opening of decalin and methylcyclohexane over alumina-based monofunctional WO3/Al2O3 and Ir/Al2O3 catalysts

Ring opening of decalin over bifunctional Ni–W carbide/Al2O3–USY catalysts and monofunctional acid Ni–W oxide/Al2O3–USY

“…5 Meanwhile, oil from the deep hydrotreatment cannot meet the diesel demand because there are still many naphthenes in the diesel fuel. 6 Therefore, the ring opening of naphthenes in fuel is a promising method to further increase the cetane number of fuel. 3,7 Some studies on ring opening of naphthenes have been published in the past years.…”

“…The monofunctional acid catalyst, monofunctional metallic catalysts and bifunctional catalysts were used in this reaction. The studies about monofunctional acid catalysts 3,6,8 showed that the ring contraction was the rst step on ring opening of decalin, and then followed by ring opening and cracking processes. And the monofunctional metallic catalysts 6,7,9,10 showed different catalytic mechanism with monofunctional acid catalysts and three different ring opening mechanisms were proposed, 11,12 including the multiplet mechanism, the dicarbene mechanism and the metallocyclobutane mechanism.…”

Ru‐Pt catalysts supported on Al2O3 and SiO2─Al2O3 for the selective ring opening of naphthenes

“…Monofunctional acid (mainly different kinds of zeolites), monofunctional metallic, and bifunctional catalysts have been proposed for performing the selective ring opening (SRO) …”

Nickel Boosts Ring‐Opening Activity of Iridium

“…[1,8,9] The RO of several cyclic molecules such as methylcyclopentane, ethylcyclopentane, methylcyclohexane, dimethylcyclopentane, dimethylcyclohexane, indane, decalin, perhydroindane and trimethylcyclohexane has been studied using Ir-supported catalysts. [1,2,[5][6][7][10][11][12][13][14] Mechanism of the metal-catalysed RO of naphthenic rings depends on the nature of the metal, its particle size, and support effects. [8,15] Iridium is reported to operate mostly through the dicarbene mechanism, implying perpendicular adsorption of two carbon atoms of a naphthenic ring, which results in the cleavage of unsubstituted secondary-secondary carbon atom bonds.…”