Characterization of a bentonitic clay and its application as catalyst in the preparation of benzyltoluenes and oligotoluenes

René Miranda, Hulme Ríos, Francisco Delgado, Miguel Castro, Antonio Cogordán, Manuel Salmón

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The preparation of oligomeric toluenes catalyzed with a bentonitic clay, using thermal energy and ultrasound, was performed and evaluated. When ortho and para benzyltoluenes were studied, the oligomerization reaction was found to be dependent of the catalyst amount, reaction time, temperature and the presence of pyridine as competitive inhibitor. A proposal for the molecular structure calculation analysis at semiempirical AM1 level was proposed based on the regioselectivity and in the oligomerization pathway. Furthermore, a detailed study to characterize the clay was performed, thus several physicochemical properties of the clay were determinated by means of: 29Si and 27Al MAS-NMR, X-ray diffraction, X-ray fluorescence, scanning electron microscopy, IR spectrophotometry, thermal analysis (DTA, TG-DTG), and adsorption techniques (N2-BET). © 2002 Elsevier Science B.V. All rights reserved.
Original languageAmerican English
Pages (from-to)217-233
Number of pages193
JournalApplied Catalysis A: General
DOIs
StatePublished - 15 May 2003

Fingerprint

Oligomerization
Clay
Catalysts
Hot Temperature
Regioselectivity
Spectrophotometry
Toluene
Thermal energy
Molecular Structure
X-Ray Diffraction
Electron Scanning Microscopy
Pyridine
Differential thermal analysis
Thermoanalysis
Molecular structure
Adsorption
Fluorescence
Ultrasonics
Nuclear magnetic resonance
X-Rays

Cite this

Miranda, René ; Ríos, Hulme ; Delgado, Francisco ; Castro, Miguel ; Cogordán, Antonio ; Salmón, Manuel. / Characterization of a bentonitic clay and its application as catalyst in the preparation of benzyltoluenes and oligotoluenes. In: Applied Catalysis A: General. 2003 ; pp. 217-233.
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abstract = "The preparation of oligomeric toluenes catalyzed with a bentonitic clay, using thermal energy and ultrasound, was performed and evaluated. When ortho and para benzyltoluenes were studied, the oligomerization reaction was found to be dependent of the catalyst amount, reaction time, temperature and the presence of pyridine as competitive inhibitor. A proposal for the molecular structure calculation analysis at semiempirical AM1 level was proposed based on the regioselectivity and in the oligomerization pathway. Furthermore, a detailed study to characterize the clay was performed, thus several physicochemical properties of the clay were determinated by means of: 29Si and 27Al MAS-NMR, X-ray diffraction, X-ray fluorescence, scanning electron microscopy, IR spectrophotometry, thermal analysis (DTA, TG-DTG), and adsorption techniques (N2-BET). {\circledC} 2002 Elsevier Science B.V. All rights reserved.",
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Characterization of a bentonitic clay and its application as catalyst in the preparation of benzyltoluenes and oligotoluenes. / Miranda, René; Ríos, Hulme; Delgado, Francisco; Castro, Miguel; Cogordán, Antonio; Salmón, Manuel.

In: Applied Catalysis A: General, 15.05.2003, p. 217-233.

Research output: Contribution to journalArticle

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AB - The preparation of oligomeric toluenes catalyzed with a bentonitic clay, using thermal energy and ultrasound, was performed and evaluated. When ortho and para benzyltoluenes were studied, the oligomerization reaction was found to be dependent of the catalyst amount, reaction time, temperature and the presence of pyridine as competitive inhibitor. A proposal for the molecular structure calculation analysis at semiempirical AM1 level was proposed based on the regioselectivity and in the oligomerization pathway. Furthermore, a detailed study to characterize the clay was performed, thus several physicochemical properties of the clay were determinated by means of: 29Si and 27Al MAS-NMR, X-ray diffraction, X-ray fluorescence, scanning electron microscopy, IR spectrophotometry, thermal analysis (DTA, TG-DTG), and adsorption techniques (N2-BET). © 2002 Elsevier Science B.V. All rights reserved.

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