Formation of coke in the disproportionation of n-propylbenzene on zeolites

Journal Article · Sun Aug 01 04:00:00 EDT 1993 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1993.1239· OSTI ID:5649820

Liu, S B; Prasad, S; Wu, J F; Ma, L J; Yang, T C ^[1]; Chiou, J T; Chang, J Y; Tsai, T C ^[2]

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1. Academia Sinica, Taipei (Taiwan, Province of China)
2. Chinese Petroleum Corp., Chia-Yi (Taiwan, Province of China)

The authors investigated the formation of coke on zeolite catalysts in the disproportionation of n-propylbenzene by means of [sup 129]Xe, [sup 27]Al, and [sup 13]C NMR spectroscopy. According to [sup 13]C CP-MAS (proton cross polarization with magic angle spinning) spectra, the coke formed in USY and ZSM-5 zeolites was classified into aliphatics and aromatics. It was found that aliphatic coke could be removed by a simple evacuation procedure. The location of the coke determined from [sup 129]Xe NMR spectra and xenon adsorption isotherms varies with the zeolite catalysts. For zeolite USY, the coke was formed inside the supercages and is mainly polyaromatic. For zeolite ZSM-5, the coke is alkylaromatic and tended to deposit at the openings of the channels rather than at their intersections. In regard to the mechanism, the reaction on USY followed bimolecular kinetics, whereas on ZSM-5 the reaction was monomolecular. 38 refs., 5 figs., 1 tab.

• OSTI ID: 5649820
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 142:2; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400 -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION ISOTHERMS
ALKYLATED AROMATICS
ALUMINIUM 27
ALUMINIUM ISOTOPES
AROMATICS
CARBON 13
CARBON ISOTOPES
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COKE
DAYS LIVING RADIOISOTOPES
DEACTIVATION
EVEN-ODD NUCLEI
HETEROGENEOUS CATALYSIS
INORGANIC ION EXCHANGERS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ION EXCHANGE MATERIALS
ISOMERIC TRANSITION ISOTOPES
ISOTHERMS
ISOTOPES
KINETICS
LIGHT NUCLEI
MAGNETIC RESONANCE
MATERIALS
MINERALS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
OXIDATION
RADIOISOTOPES
REACTION KINETICS
REDUCTION
RESONANCE
SILICATE MINERALS
STABLE ISOTOPES
XENON 129
XENON ISOTOPES
ZEOLITES