Transalkylation of alkylaromatic compounds on silicates with ZSM-5 structure containing Al, B, and Ga

H. K. Beyer, Borbély G. Páł

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18 Citations (Scopus)

Abstract

The decomposition of n-propylammonium precursors of silicates with ZSM-5 structure containing Al, Band Ga, respectively, and the acidity and thermal stability of the resulting hydrogen forms were studied by infrared spectroscopic, x-ray diffractometric and thermal methods. The acidity of the as-synthesized products decreases in the substitution sequence B>Al> Ga. The hydrogen form of the boron analogue of ZSM-5 was found to be thermally instable, the decomposition of the precursor results in a silicalite-like product containing extra-framework boron oxide species. After heat treatment the acidity decreases in the substitution sequence Al> Ga >B. contrary to the boron counterpart the hydrogen form of ZSM-5 zeolite and of its Ga analogue are active and highly selective transalkylation catalysts. The catalytic conversion of the systems cumene-benzene, cumene-toluene and ethylbenzene-toluene were studied. Only acid sites of the Bronsted type seem to be involved in the transalkylation. Pretreatment of the catalysts under "selfsteaming" conditions favours side reactions, e.g. cumene cracking. Steaming results in dramatic' changes in activity and selectivity.

Original languageEnglish
Pages (from-to)867-874
Number of pages8
JournalStudies in Surface Science and Catalysis
Volume28
Issue numberC
DOIs
Publication statusPublished - 1986

Fingerprint

Silicates
Acidity
acidity
Boron
Hydrogen
silicates
Toluene
toluene
boron
Substitution reactions
hydrogen
substitutes
analogs
boron oxides
Decomposition
decomposition
catalysts
Catalysts
Ethylbenzene
products

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Catalysis
  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Surfaces, Coatings and Films

Cite this

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title = "Transalkylation of alkylaromatic compounds on silicates with ZSM-5 structure containing Al, B, and Ga",
abstract = "The decomposition of n-propylammonium precursors of silicates with ZSM-5 structure containing Al, Band Ga, respectively, and the acidity and thermal stability of the resulting hydrogen forms were studied by infrared spectroscopic, x-ray diffractometric and thermal methods. The acidity of the as-synthesized products decreases in the substitution sequence B>Al> Ga. The hydrogen form of the boron analogue of ZSM-5 was found to be thermally instable, the decomposition of the precursor results in a silicalite-like product containing extra-framework boron oxide species. After heat treatment the acidity decreases in the substitution sequence Al> Ga >B. contrary to the boron counterpart the hydrogen form of ZSM-5 zeolite and of its Ga analogue are active and highly selective transalkylation catalysts. The catalytic conversion of the systems cumene-benzene, cumene-toluene and ethylbenzene-toluene were studied. Only acid sites of the Bronsted type seem to be involved in the transalkylation. Pretreatment of the catalysts under {"}selfsteaming{"} conditions favours side reactions, e.g. cumene cracking. Steaming results in dramatic' changes in activity and selectivity.",
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AU - Beyer, H. K.

AU - Páł, Borbély G.

PY - 1986

Y1 - 1986

N2 - The decomposition of n-propylammonium precursors of silicates with ZSM-5 structure containing Al, Band Ga, respectively, and the acidity and thermal stability of the resulting hydrogen forms were studied by infrared spectroscopic, x-ray diffractometric and thermal methods. The acidity of the as-synthesized products decreases in the substitution sequence B>Al> Ga. The hydrogen form of the boron analogue of ZSM-5 was found to be thermally instable, the decomposition of the precursor results in a silicalite-like product containing extra-framework boron oxide species. After heat treatment the acidity decreases in the substitution sequence Al> Ga >B. contrary to the boron counterpart the hydrogen form of ZSM-5 zeolite and of its Ga analogue are active and highly selective transalkylation catalysts. The catalytic conversion of the systems cumene-benzene, cumene-toluene and ethylbenzene-toluene were studied. Only acid sites of the Bronsted type seem to be involved in the transalkylation. Pretreatment of the catalysts under "selfsteaming" conditions favours side reactions, e.g. cumene cracking. Steaming results in dramatic' changes in activity and selectivity.

AB - The decomposition of n-propylammonium precursors of silicates with ZSM-5 structure containing Al, Band Ga, respectively, and the acidity and thermal stability of the resulting hydrogen forms were studied by infrared spectroscopic, x-ray diffractometric and thermal methods. The acidity of the as-synthesized products decreases in the substitution sequence B>Al> Ga. The hydrogen form of the boron analogue of ZSM-5 was found to be thermally instable, the decomposition of the precursor results in a silicalite-like product containing extra-framework boron oxide species. After heat treatment the acidity decreases in the substitution sequence Al> Ga >B. contrary to the boron counterpart the hydrogen form of ZSM-5 zeolite and of its Ga analogue are active and highly selective transalkylation catalysts. The catalytic conversion of the systems cumene-benzene, cumene-toluene and ethylbenzene-toluene were studied. Only acid sites of the Bronsted type seem to be involved in the transalkylation. Pretreatment of the catalysts under "selfsteaming" conditions favours side reactions, e.g. cumene cracking. Steaming results in dramatic' changes in activity and selectivity.

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