Shape-selectivity over HZSM-5 modified by chemical vapor deposition of silicon alkoxide

Journal Article · Mon Apr 01 04:00:00 EST 1991 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(91)90312-R· OSTI ID:5542861

Hibino, Takashi; Niwa, Miki; Murakami, Yuichi ^[1]

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1. Nagoya Univ., Furo-cho, Chikusa-ku, Nagoya (Japan)

Alkylation of toluene with methanol and toluene disproportionation have been carried out over HZSM-5 zeolites modified by chemical vapor deposition of silicon alkoxide. As the silica amount increased, the selectivity to m- and o-xylenes decreased, whereas that to p-xylene increased. The fraction of the para isomer in xylenes increased to more than 98%. From adsorption measurements and test reactions, it was found that this modification resulted in the narrowing of the pore-opening size and the inactivation of the external surface. The high para-selectivity was caused primarily by the narrowing of the pore-opening size.

• OSTI ID: 5542861
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 128:2; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
020500 -- Petroleum-- Products & By-Products
ADSORPTION
ALKOXIDES
ALKYLATED AROMATICS
ALKYLATION
AROMATICS
CATALYTIC EFFECTS
CHEMICAL COATING
CHEMICAL PREPARATION
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHEMICAL VAPOR DEPOSITION
COMPARATIVE EVALUATIONS
CRYSTAL STRUCTURE
DEPOSITION
DISSOCIATION
EVALUATION
HYDROCARBONS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
ISOMERS
MATERIALS
MICROSTRUCTURE
MINERALS
MODIFICATIONS
ORGANIC COMPOUNDS
POROSITY
SILICON COMPOUNDS
SORPTION
SURFACE COATING
SYNTHESIS
TOLUENE
XYLENE-PARA
XYLENES
YIELDS
ZEOLITES