INCAPE   05401
INSTITUTO DE INVESTIGACIONES EN CATALISIS Y PETROQUIMICA "ING. JOSE MIGUEL PARERA"
Unidad Ejecutora - UE
artículos
Título:
Gas phase acylation of guaiacol with acetic acid on acid catalysts
Autor/es:
PADRÓ, C.L.; SAD, M.E.; VALENCIA, M.K. MONTAÑEZ
Revista:
APPLIED CATALYSIS B-ENVIRONMENTAL
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2020 vol. 278 p. 1 - 14
ISSN:
0926-3373
Resumen:
Gas phase acylation ofguaiacol on acid solids was studied using catalysts with different acid site density, nature andstrength. The main products formed were acetovanillone, 2-acetoxyanisole andcatechol using acetic acid as acylating reactant. The product distribution considerably changed with thecatalyst nature. Catalysts with Lewis and Brønsted acid sites promoted both theO-acylation route (2-acetoxyanisoleformation) and C-acylation route (acetovanillone formation) and formed catechol mainly by demethylationof guaiacol; catalysts with large pore size also favored catechol formation bya bimolecular disproportionationreaction. Catalyst deactivation took place, thus the coke formation was studiedsuggesting that the Lewis acid sites, responsible of catechol formation, weremore affected by deactivation. The effect of reaction temperature, molarreactant ratio and the use of different acylating on guaiacol conversion andproducts formation were also evaluated. HZSM-5 catalyst, 523 K and acetic acidwere appropriate to promote C-acylation during gas phase guaiacol acylation.