Transformation of some light mono- and dialkylbenzenes on H-ZSM-5
- Central Research Institute for Chemistry, Budapest (Hungary)
The catalytic alkylation of toluene with small olefins is of great industrial importance. Medium pore-size zeolites such as ZSM-5 are active in alkylation and also effect the transformation of alkyl aromatic hydrocarbons, favoring the formation of the para-substituted derivatives. In zeolites, where intracrystalline pore dimensions approach molecular dimensions, the mass transport proceeds in the regime of the so-called [open quotes]configurational diffusion.[close quotes] In ZSM-5 the diffusivities of aromatic molecules decreases systematically with the increasing effective minimum dimension of the molecules. Shape selectivity is governed by the diffusivity of the aromatic molecules inside the zeolite crystals, consequently it decreases with decreasing crystal size and vice versa. In ethylation of toluene on unmodified microcrystalline H-ZSM-5, a complex product mixture containing benzene, xylenes, ethylbenzene, traces of trimethyl- and diethylbenzenes was obtained. In this work the expected side reactions of toluene ethylation, as transformations of toluene (T), p-ethyltoluene (PET), ethylbenzene (EB), and xylenes (X) were studied on the same H-ZSM-5 under the conditions of ethylation in order to shed some light on the mechanism directing the formation of the product mixture.
- OSTI ID:
- 7045971
- Journal Information:
- Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 145:2; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
Similar Records
Ethylation of toluene and transformation of p-ethyltoluene on H-ZSM-5 and ZSM-5 modified with MgO
ZSM-5/ZSM-12 catalyst mixture for cracking alkylbenzenes
Related Subjects
020400 -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKYLATED AROMATICS
ALKYLATION
AROMATICS
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTIONS
HETEROGENEOUS CATALYSIS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MINERALS
ORGANIC COMPOUNDS
SILICATE MINERALS
ZEOLITES