Ethylation of toluene and transformation of p-ethyltoluene on H-ZSM-5 and ZSM-5 modified with MgO

Journal Article · Fri May 01 00:00:00 EDT 1992 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(92)90291-O· OSTI ID:6938975

Engelhardt, J; Kallo, D; Zsinka, I ^[1]

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1. Hungarian Academy of Sciences, Budapest (Hungary)

Shape-selective properties of medium pore size zeolites like ZSM-5 are well known. For the conversion of alkyl aromatics, the paraselectivity is of great interest. It was found that in toluene ethylation on ZSM-5, p-ethyltoluene is the primary product. Isomerization to m-ethyltoluene and transalkylation and disproportionation of toluene and ethyltoluene may result in a complex reaction mixture. Modification of ZSM-5, e.g., with different phosphorous and magnesium compounds or by coke deposition, leads to the increase in selectivity in the formation of p-ethyltoluene. It was concluded that a low concentration of MgO in ZSM-5 results in a deceleration of disproportionation and consequently in an increase in ethylation selectivity; a higher concentration of MgO suppresses isomerization as well, thereby increasing the paraselectivity.

• OSTI ID: 6938975
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 135:1; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ALKALINE EARTH METAL COMPOUNDS
ALKYL RADICALS
ALKYLATED AROMATICS
ALKYLATION
AROMATICS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
DISSOCIATION
ETHYL RADICALS
HYDROCARBONS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
ISOMERIZATION
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS
MINERALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RADICALS
SILICATE MINERALS
TOLUENE
YIELDS
ZEOLITES