Some catalytic properties of ZSM-5, a new shape-selective zeolite
The new ZSM-5 zeolite has pore openings which sorb, at room temperature, straight-chain monomethyl-substituted paraffins and monocyclic hydrocarbons and excludes molecules larger than 1,3,5-trimethylbenzene. In the conversion of an equi-weight mixture of n-hexane, 3-methylpentane, and 2,3-dimethylbutane on amorphous silica-alumina, 2,3-dimethylbutane was four times more reactive than n-hexane and twice as reactive as 3-methylpentane; with ZSM-5, n-hexane was converted 8.8 times faster than 3-methylpentane at 375/sup 0/ and at the same rate at 510/sup 0/C, but further temperature increases did not change the conversion ratio to the intrinsic 0.5:1, as apparently the bulkier 3-methylpentane has a lower packing density inside the zeolite. Conversions of a mixture of 19 C/sub 5/-C/sub 7/ hydrocarbons at 35 atm and 315/sup 0/-340/sup 0/C showed the rates of disappearance, by chain length, as: n-C/sub 7/ > n-C/sub 6/ > n-C/sub 5/, and by isomers, as: nC/sub 7/ > 2-methyl-C/sub 6/ > 3-methyl-C-C/sub 6/ > dimethyl-C/sub 5/ > ethyl-C/sub 5/ > n-C/sub 6/ > 2-methyl-C/sub 5/ > 3-methyl-C/sub 5/ > dimethyl-C/sub 4/. The ratio of toluene-to-benzene alkylation rate constants at 315/sup 0/ and 340/sup 0/C and 35 atm was 0.7:1, compared with 1.4:1 on nonshape-selective catalysts. Graphs, tables, and 15 references.
- Research Organization:
- Mobil Res. Dev. Corp.
- OSTI ID:
- 5714182
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 52:3; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020400* -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALKANES
ALKYLATION
CATALYSIS
CATALYSTS
CATALYTIC CRACKING
CATALYTIC EFFECTS
CHEMICAL PROPERTIES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CRACKING
DECOMPOSITION
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROCARBONS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
KINETICS
MATERIALS
MINERALS
MORPHOLOGY
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PARAFFIN
PETROLEUM
PETROLEUM FRACTIONS
POROSITY
PYROLYSIS
REACTION KINETICS
SYNTHETIC MATERIALS
THERMOCHEMICAL PROCESSES
WAXES
ZEOLITES