Alkylation of toluene with methanol over AlPO sub 4 , AlPO sub 4 -Al sub 2 O sub 3 , AlPO sub 4 -TiO sub 2 , and AlPO sub 4 -ZrO sub 2 catalysts

Journal Article · Tue Sep 01 04:00:00 EDT 1992 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(92)90138-8· OSTI ID:7148228

Blanco, A; Campelo, J M; Garcia, A; Luna, D; Marinas, J M; Romero, A A ^[1]

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1. Cordoba Univ., Avda. S. Alberto Magno (Spain)

The catalytic activity and selectivity of a series of AlPO{sub 4} (AP) and AP-metal oxide systems (Al{sub 2}O{sub 3}, TiO{sub 2}, and ZrO{sub 2} with an AP/metal oxide weight ratio of 3) were investigated at temperatures ranging from 673 to 873 K for the gas-phase microcatalytic alkylation of toluene with methanol. The results show that AP's catalyst exhibits surface acid sites accessible to toluene produces a mixture of xylenes (XY) as principal products, although 1,2,4- and 1,2,3-trimethylbenzenes (TMB) were also found to be dialkylation products for AP-Al{sub 2}O{sub 3} catalysts. Scarcely any side-chain-methylation of toluene to ethylbenzene (ETB) is found. The alkylation reaction follows the Bassett-Habgood kinetic equation for first-order reaction processes. The influence of the reaction temperature, pulse number, and toluene/methanol molarity upon the conversion of toluene and the selectivities of the products were investigated. The activity of AP and AP-metal oxide catalysts in the ring-methylation of toluene decreases in the order AP-Al{sub 2}O{sub 3} {much gt} AP > AP-TiO{sub 2} > AP-ZrO{sub 2}. This order is relatively well interpreted in basis to the surface acid properties studied gas-chromatographically through the irreversible adsorption of pyridine at temperatures in the range 473 to 673 K. This indicates that Broensted acidity decreases when Al{sub 2}O{sub 3} is substituted by TiO{sub 2} or ZrO{sub 2} in the AP-metal oxide system.

• OSTI ID: 7148228
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 137:1; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

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02 PETROLEUM
020400 -- Petroleum-- Processing
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ADSORPTION
ALCOHOLS
ALKYLATED AROMATICS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ALUMINIUM PHOSPHATES
AROMATICS
AZINES
BROENSTED ACIDS
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHROMATOGRAPHY
COMPARATIVE EVALUATIONS
EQUATIONS
EVALUATION
GAS CHROMATOGRAPHY
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INORGANIC ACIDS
KINETIC EQUATIONS
METHANOL
METHYLATION
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PH VALUE
PHOSPHATES
PHOSPHORUS COMPOUNDS
PYRIDINES
SEPARATION PROCESSES
SORPTION
SURFACE PROPERTIES
SYNTHESIS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TITANIUM COMPOUNDS
TITANIUM OXIDES
TOLUENE
TRANSITION ELEMENT COMPOUNDS
XYLENES
YIELDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES