Conversion of 1-butene to aromatics over AlPO/sub 4/-11
The activity of the crystalline molecular sieve AlPO/sub 4/-11 for the conversion of 1-butene to benzene, toluene, ethylbenzene, and the xylenes (BTEX) was followed as a function of temperature, time on stream, nickel loading, and methane dilution of the olefin feed. A maximum in liquid production, selectivity to BTEX, and cracking to C(1), C(2), and C(3) products was observed at 773 K. Over 8 h on stream at this temperature, selectivity to benzene and total liquid product increased significantly, the amount of cracked gases increased somewhat, and selectivity to toluene, ethylbenzene, and xylenes decreased somewhat. Nickel loading depressed the amount of BTEX produced probably due to rapid coking of the catalyst. Methane dilution of the feed stream caused a decrease in total liquid product but increased the liquid density as a result of changes in component selectivities. Even in the most favorable case, the activity of AlPO/sub 4/-11 was far less than that of HZSM-5 for the same reaction. The results support a mechanism that proceeds via partial dehydrogenation to butadiene which then participates in a dimerization step, possibly of a Diels-Adler type. C(1) to C(3) products arise from cracking of oligomers and not directly from the 1-butene feed.
- Research Organization:
- Univ. of Toronto, Ontario (Canada)
- OSTI ID:
- 5364700
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 110:1; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020400* -- Petroleum-- Processing
ADSORBENTS
ALKANES
ALKENES
ALKYLATED AROMATICS
ALUMINIUM COMPOUNDS
ALUMINIUM PHOSPHATES
AROMATICS
BENZENE
BUTADIENE
BUTENES
CATALYSIS
CATALYTIC CRACKING
CATALYTIC EFFECTS
CATALYTIC REFORMING
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CRACKING
DECOMPOSITION
DIENES
ELEMENTS
HYDROCARBONS
KINETICS
METALS
METHANE
MOLECULAR SIEVES
NICKEL
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
POLYENES
PROMOTERS
PYROLYSIS
REACTION INTERMEDIATES
REACTION KINETICS
REFORMER PROCESSES
STEAM
SYNTHESIS
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES
TIME DEPENDENCE
TOLUENE
TRANSITION ELEMENTS
XYLENES
YIELDS