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Artículo

Acylation of phenol on solid acids: Study of the deactivation mechanism

Padro, CristinaIcon ; Apesteguia, Carlos RodolfoIcon
Fecha de publicación: 10/2005
Editorial: Elsevier Science
Revista: Catalysis Today
ISSN: 0920-5861
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Otras Ingeniería Química

Resumen

The deactivation mechanism of the gas-phase synthesis of o-hydroxyacetophenone (o-HAP) via acylation of phenol with acetic acid was studied on Al-MCM-41 and zeolites HY, HBeta and HZSM-5. The o-HAP yield remained constant with time-on-stream on HZSM-5 but drastically decreased on the other samples because of coke formation. The origin and nature of coke precursor species were studied by employing as reactants, the key reaction intermediates and products involved in the phenol acylation reaction network. It was found that coke precursors are formed from consecutive condensation reactions and not from any ketene formation by phenyl acetate decomposition. Specifically, it is proposed that o-acetoxyacetophenone (o-AXAP), which is formed by reaction between o-HAP and acetic acid, is the key intermediate specie responsible for the formation of carbonaceous deposits and consequently, for the activity decay observed on Al-MCM-41, HY and HBeta samples. The narrow pore size structure of zeolite HZSM-5 would hinder the formation of bulky o-AXAP, thereby, decreasing drastically the formation of coke.
Palabras clave: Acylation Reactions , Catalyst Deactivation , O-Hydroxyacetophenone Synthesis , Solid Acids
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/73023
DOI: http://dx.doi.org/10.1016/j.cattod.2005.07.078
Colecciones
Articulos(INCAPE)
Articulos de INST.DE INVEST.EN CATALISIS Y PETROQUIMICA "ING. JOSE MIGUEL PARERA"
Citación
Padro, Cristina; Apesteguia, Carlos Rodolfo; Acylation of phenol on solid acids: Study of the deactivation mechanism; Elsevier Science; Catalysis Today; 107-108; 10-2005; 258-265
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