Production of methyl-substituted aromatics via novel zeolite catalyst process routes
Shape selective zeolites with structures related to zeolites ZSM-5 and ZSM-48 were synthesized, characterized and evaluated for potential application to the production of methyl-substituted aromatic hydrocarbons whose hydrogenated analogs are in the aviation turbine fuel boiling range. Zeolite ZSM-5 with high crystallinity could be synthesized in the presence of organic bases such as 1,6-hexanediamine (C6DN) and tetrapropylammonium bromide (TPABr). Crystalline ZSM-48 could be synthesized only at initial molar silica-to-alumina ratios greater than 200. A non-intergrowth mixture of ZSM-5 and ZSM-48 was obtained at silica-to-alumina rations between 50 and 200. The cracking of normal-hexane was used to determine the acidity of synthesized zeolites. It was determined that pentanes were absent from the reaction product for the isomerization of isobutane over synthesized ZSM-5 and SZM-48 zeolites. The cut-off point in the hydrocarbon product distribution for the methanol conversion over synthesized ZSM-5 was found at C{sub 10} aromatics. A similar trend was observed with ZSM-48; however, aromatic selectivity was lower. A study of the catalytic conversion of methanol and the selectivity of the individual catalysts and of various combinations and sequences of the catalysts was conduced in a high pressure fixed bed reactor system. ZSM-48 was found to be highly selective for olefins at moderate opening conditions when converting methanol. The olefins produced from the conversion of methanol over ZSM-48 were converted to higher boiling hydrocarbons over ZSM-5 in a second reactor operated at 7 atm.
- Research Organization:
- Utah Univ., Salt Lake City, UT (USA)
- OSTI ID:
- 5536073
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020400* -- Petroleum-- Processing
ALCOHOLS
ALKANES
ALKENES
AMMONIA
AROMATICS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CONTROL
CRACKING
CRYSTAL STRUCTURE
DECOMPOSITION
DESORPTION
ELECTRON MICROSCOPY
HEXANE
HYDRIDES
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
ISOMERIZATION
MATERIALS
METHANOL
MICROSCOPY
MINERALS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
ORGANIC COMPOUNDS
PENTANE
PERFORMANCE TESTING
PYROLYSIS
SCANNING ELECTRON MICROSCOPY
SYNTHESIS
TEMPERATURE CONTROL
TESTING
THERMOCHEMICAL PROCESSES
ZEOLITES