Reactions of methylcyclohexane and n-heptane over supported Pt and Pt-Re catalysts

Journal Article · Thu Oct 01 04:00:00 EDT 1987 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(87)90313-7· OSTI ID:5327715

Doolittle, W J; Skoularikis, N D; Coughlin, R W

Reactions of methylcyclohexane (MCH) and n-heptane were compared, using industrial Pt/Al/sub 2/O/sub 3/ or Pt-Re/Al/sub 2/O/sub 3/ catalysts. Although the same products were generally observed, product selectivity and rate of catalyst deactivation differed substantially for the two reactants. With n-heptane, greater amounts of light cracked products (C/sub 1/-C/sub 5/), heavy alkylated aromatics, and coke were produced. With n-heptane the total aromatic yield (benzene + toluene yields) was substantially less and the decline in the total aromatic yield during the first feed cycle was in general much greater. Selectivity for aromatic products immediately following hydrogen treatment of the coked Pt-Re catalysts was less with MCH than with n-heptane. Presulfiding the Pt catalyst slightly poisoned the dehydrogenation and dehydrocyclization activities. However, the presulfided Pt-Re/Al/sub 2/O/sub 3/ catalyst was very selective for these reactions and a high total aromatic yield was observed with either MCH or n-heptane. Sulfur quenched hydrogenolysis, demethylation, and reactions which form alkylated aromatics of higher molecular weight than toluene.

• Research Organization: Univ. of Connecticut, Storrs (USA)
• OSTI ID: 5327715
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 107:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ALKANES
ALKYLATED AROMATICS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AROMATICS
BENZENE
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CATALYTIC REFORMING
CHALCOGENIDES
CHEMICAL REACTIONS
CYCLOALKANES
DEACTIVATION
ELEMENTS
HEPTANE
HYDROCARBONS
HYDROGENATION
METALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
REFORMER PROCESSES
REGENERATION
RHENIUM
SULFIDATION
TOLUENE
TRANSITION ELEMENTS