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Title: Comparative study of various platinum catalysts in skeletal reactions of C/sub 6/ hydrocarbons. [3-methylpentane and methylcyclopentane]

Abstract

The reactions of 3-methylpentane (3MP) and methylcyclopentane (MCP) were tested in a pulse-microcatalytic reactor in helium with 0-100Vertical Bar3< hydrogen carrier gas on platinum black (PtB), and platinum supported on carbon (PtC), alumina (PtAl), or silica (PtSi). The results were analyzed in terms of selectivity for saturated C/sub 6/ products as opposed to fragmentation (S1); selectivity for saturated C/sub 6/ products vs. dehydrogenated C/sub 6/ products, mainly benzene (S2); and selectivity for 2-methylcyclopentane vs. n-hexane in the five-membered ring opening step (S3). Type S1 and S2 selectivities increased with increasing hydrogen pressure, and for MCP the catalysts could be arranged in order with respect to the decreasing amount of hydrogen available: PtC Vertical Bar3: PtB (at 573/sup 0/K reaction temperature) Vertical Bar3: PtAl Vertical Bar3: PtSi Vertical Bar3: PtB (at 648/sup 0/K). Type S3 selectivity depended strongly on surface hydrogen concentrations and on crystallite size, and under hydrogen-rich conditions it decreased in the order PtB (573/sup 0/K) Vertical Bar3: PtB (648/sup 0/K) Vertical Bar3: PtC Vertical Bar3: PtAl Vertical Bar3: PtSi. Nearly all variations in selectivity could be interpreted as effects of varying hydrogen pressure, and no definite effects of the supports were observed.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Inst. Isotopes, Hung. Acad. Sci., Budap.
OSTI Identifier:
6684728
Alternate Identifier(s):
OSTI ID: 6684728
Resource Type:
Journal Article
Journal Name:
J. Catal.; (United States)
Additional Journal Information:
Journal Volume: 56:2
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ALKANES; CHEMICAL REACTIONS; CATALYSTS; COMPARATIVE EVALUATIONS; CYCLOALKANES; PLATINUM; CATALYTIC EFFECTS; ALUMINIUM OXIDES; CARBON; CATALYST SUPPORTS; CHEMICAL REACTORS; HYDROGEN; PARTIAL PRESSURE; PRESSURE DEPENDENCE; QUANTITY RATIO; SILICA; ALUMINIUM COMPOUNDS; CHALCOGENIDES; ELEMENTS; HYDROCARBONS; METALS; MINERALS; NONMETALS; ORGANIC COMPOUNDS; OXIDE MINERALS; OXIDES; OXYGEN COMPOUNDS; PLATINUM METALS; SILICON COMPOUNDS; SILICON OXIDES; TRANSITION ELEMENTS 400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)

Citation Formats

Bragin, O.V., Karpinski, Z., Matusek, K., Paal, Z., and Tetenyi, P. Comparative study of various platinum catalysts in skeletal reactions of C/sub 6/ hydrocarbons. [3-methylpentane and methylcyclopentane]. United States: N. p., 1979. Web.
Bragin, O.V., Karpinski, Z., Matusek, K., Paal, Z., & Tetenyi, P. Comparative study of various platinum catalysts in skeletal reactions of C/sub 6/ hydrocarbons. [3-methylpentane and methylcyclopentane]. United States.
Bragin, O.V., Karpinski, Z., Matusek, K., Paal, Z., and Tetenyi, P. Thu . "Comparative study of various platinum catalysts in skeletal reactions of C/sub 6/ hydrocarbons. [3-methylpentane and methylcyclopentane]". United States.
@article{osti_6684728,
title = {Comparative study of various platinum catalysts in skeletal reactions of C/sub 6/ hydrocarbons. [3-methylpentane and methylcyclopentane]},
author = {Bragin, O.V. and Karpinski, Z. and Matusek, K. and Paal, Z. and Tetenyi, P.},
abstractNote = {The reactions of 3-methylpentane (3MP) and methylcyclopentane (MCP) were tested in a pulse-microcatalytic reactor in helium with 0-100Vertical Bar3< hydrogen carrier gas on platinum black (PtB), and platinum supported on carbon (PtC), alumina (PtAl), or silica (PtSi). The results were analyzed in terms of selectivity for saturated C/sub 6/ products as opposed to fragmentation (S1); selectivity for saturated C/sub 6/ products vs. dehydrogenated C/sub 6/ products, mainly benzene (S2); and selectivity for 2-methylcyclopentane vs. n-hexane in the five-membered ring opening step (S3). Type S1 and S2 selectivities increased with increasing hydrogen pressure, and for MCP the catalysts could be arranged in order with respect to the decreasing amount of hydrogen available: PtC Vertical Bar3: PtB (at 573/sup 0/K reaction temperature) Vertical Bar3: PtAl Vertical Bar3: PtSi Vertical Bar3: PtB (at 648/sup 0/K). Type S3 selectivity depended strongly on surface hydrogen concentrations and on crystallite size, and under hydrogen-rich conditions it decreased in the order PtB (573/sup 0/K) Vertical Bar3: PtB (648/sup 0/K) Vertical Bar3: PtC Vertical Bar3: PtAl Vertical Bar3: PtSi. Nearly all variations in selectivity could be interpreted as effects of varying hydrogen pressure, and no definite effects of the supports were observed.},
doi = {},
journal = {J. Catal.; (United States)},
number = ,
volume = 56:2,
place = {United States},
year = {1979},
month = {2}
}