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Roles of ZSM‐5 modifier agents in selective toluene disproportionation
Author(s) -
Uguina Maria A.,
Sotelo Jose L.,
Serrano David P.
Publication year - 1993
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450710408
Subject(s) - disproportionation , isomerization , toluene , xylene , chemistry , zeolite , zsm 5 , selectivity , acid strength , m xylene , photochemistry , organic chemistry , inorganic chemistry , catalysis
Selective toluene disproportionation has been studied over ZSM‐5 zeolites modified with P , Si and Cs compounds. For the P and Si modified samples, p ‐xylene proportion in the primary product was 100% due to the diffusional control on the internal xylene isomerization. The number and strength of the acid sites are reduced by the three modifier agents but a relationship between para‐selectivity and the decrease of the acid strength has not been observed. The most para‐selective samples have been those modified with Si which has been related to the deposition of this agent on the external surface of the zeolite crystals avoiding the primary product isomerization.