The methylation of phenol and phenol derivatives is very significant from the industrial point of view because the products of phenol and diphenol alkylation are important intermediates for the synthesis of resins, dyes, antioxidant, vitamins, food additives and so on. Methylation can be performed either in liquid or gas phase and the catalysts used for the methylation reaction can be either acid (H-zeolites, γ-alumina) or basic (alkaline-earth metal oxides or transition metal oxides). The products obtained in the two cases are different because different intermediates are formed on the surface of the catalysts. In the present contribution, MgO-based systems modified by the addition of Fe, Cr and Al (in a 2 : 1 Mg/Me ratio) were studied, using in situ FTIR spectroscopy to examine surface acidity and basicity, with the aim of comparing the surface behaviours of these materials with their catalytic activity: in fact, the final goal of the work, that the present contribution belongs to, is to propose a credible hypotesis of the actual mechanism existing in the reaction(s) occurring between phenol and methanol, and leading to o-cresol and/or 2,6-xylenol.

Surface FTIR-spectroscopic characterization of bi-functional Mg/Me mixed oxides catalysts used for phenol methylation

MAGNACCA, Giuliana;CERRATO, Giuseppina;CROCELLA', VALENTINA;MORTERRA, Claudio
2008-01-01

Abstract

The methylation of phenol and phenol derivatives is very significant from the industrial point of view because the products of phenol and diphenol alkylation are important intermediates for the synthesis of resins, dyes, antioxidant, vitamins, food additives and so on. Methylation can be performed either in liquid or gas phase and the catalysts used for the methylation reaction can be either acid (H-zeolites, γ-alumina) or basic (alkaline-earth metal oxides or transition metal oxides). The products obtained in the two cases are different because different intermediates are formed on the surface of the catalysts. In the present contribution, MgO-based systems modified by the addition of Fe, Cr and Al (in a 2 : 1 Mg/Me ratio) were studied, using in situ FTIR spectroscopy to examine surface acidity and basicity, with the aim of comparing the surface behaviours of these materials with their catalytic activity: in fact, the final goal of the work, that the present contribution belongs to, is to propose a credible hypotesis of the actual mechanism existing in the reaction(s) occurring between phenol and methanol, and leading to o-cresol and/or 2,6-xylenol.
2008
123 (10-11)
1505
1515
Chemisorption/physisorption: adsorbates on surfaces; Solid-gas/vacuum interfaces: types of surfaces; Oxide surfaces; Surface and interface chemistry; heterogeneous catalysis at surfaces
G. Magnacca; G. Cerrato; V. Crocellà; C. Morterra
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/57355
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