title: Ring opening of methylcyclohexane over platinum-loaded zeolites.
abstract: The activity of different platinum-loaded zeolites (Mordenite, ZSM-12, ZSM-5, ZSM-23) was investigated in the hydroconversion of methylcyclohexane (MCH), in the context of upgrading highly aromatic distillates for fuel blending. In all cases, conversion of MCH proceeds according to a pathway where the primary products are a mixture of dimethylcyclopentanes and ethylcyclopentane formed by isomerization and ring contraction of MCH. The primary products undergo consecutive ring-opening reactions with formation of n- and isoheptanes. The latter further react to form lower-molecular-weight n- and isoalkanes. The selectivity and distribution of products deriving from ring-contraction and ring-opening reactions are strongly affected by the pore size and topology of the zeolites. ZSM-5 exhibits a strong reactant shape-selectivity effect on ring-opening products. The evaluated zeolites show the following order of activity in the conversion of methylcyclohexane: Mordenite>ZSM-12>ZSM-5>ZSM-23.
authors.affiliation: Eni R&M Division, Via Maritano 26, San Donato Milanese, Milan, Italy. vincenzo.calemma@emi.it
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Calemma
authors.forename: Angela
authors.initials: A
authors.lastname: Carati
authors.forename: Cristina
authors.initials: C
authors.lastname: Flego
authors.forename: Roberto
authors.initials: R
authors.lastname: Giardino
authors.forename: Federica
authors.initials: F
authors.lastname: Gagliardi
authors.forename: Roberto
authors.initials: R
authors.lastname: Millini
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Bellussi
mesh_terms: D002384:Catalysis; D003510:Cyclohexanes / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D010984:Platinum / Q000737:chemistry*; D016062:Porosity; D017641:Zeolites / Q000737:chemistry*
chemical_list: D003510:Cyclohexanes; D017641:Zeolites; D010984:Platinum; C521475:methylcyclohexane