Alkylations of benzene, alkylbenzenes, and halobenzenes catalyzed by protonated mordenite pretreated with chlorofluorocarbons

Journal Article · Sun Dec 01 00:00:00 EST 1991 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(91)90167-3· OSTI ID:7169184

Kodama, Hiroto; Okazaki, Susumu ^[1]

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1. Ibaraki Univ. (Japan)

The chlorofluorocarbon (CFC) treatment of protonated mordenite (HM) was carried out in a flow reactor under ordinary pressure, usually at 600C for 10 min using CCIF{sub 3} as a treatment agent. The mordenite structure was almost completely retained during the CFC treatment. Evidence for dealumination and surface fluorination was observed by XPS examination. Decrease of surface acidity, as seen by NH{sub 3-}TPD, accompanied the treatment. The function of HM as a catalyst for alkylations of benzene and alkylated or halobenzenes with methanol was greatly enhanced by the CFC treatment. In particular, the activity maintenance was remarkably improved. Thus, in the alkylations at 300C under the molar ratios of CH{sub 3}OH/Aromatic compound = 1 and W/F = 81.2 (for toluene) or 97.5 (for 1,2,4-trimethylbenzene (TBM)) g h/mol, the conversions at the initial stage of the run were increased from 27 to 65% (for toluene) and from 12 to 47% (for TMB) by CFC treatment of the Hm catalyst. In addition, the conversions of benzene and TMB were well maintained at about 60 and 40%, respectively, throughout the running time of 3 h in the reactions catalyzed by the treated HM, while the conversions of benzene and TMB rapidly decreased and became almost zero within 90 min in the reaction catalyzed by untreated HM.

• OSTI ID: 7169184
• Journal Information: Journal of Catalysis; (United States), Vol. 132:2; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
ALKYLATED AROMATICS
METHYLATION
BENZENE
MORDENITE
CATALYTIC EFFECTS
TOLUENE
ALUMINIUM
AMMONIA
CATALYSTS
CHEMICAL PREPARATION
CHLOROFLUOROCARBONS
COMPARATIVE EVALUATIONS
DEMINERALIZATION
DESORPTION
FLUORINATION
METHANOL
PETROLEUM INDUSTRY
PH VALUE
PHOTOELECTRON SPECTROSCOPY
REMOVAL
TEMPERATURE CONTROL
THERMOCHEMICAL PROCESSES
X-RAY SPECTROSCOPY
ALCOHOLS
AROMATICS
CHEMICAL REACTIONS
CONTROL
ELECTRON SPECTROSCOPY
ELEMENTS
EVALUATION
HALOGENATION
HYDRIDES
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INDUSTRY
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
METALS
MINERALS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
SEPARATION PROCESSES
SILICATE MINERALS
SORPTION
SPECTROSCOPY
SYNTHESIS
ZEOLITES
020400* - Petroleum- Processing