INIQUI 05448
INSTITUTO DE INVESTIGACIONES PARA LA INDUSTRIA QUIMICA
Unidad Ejecutora - UE
artículos
Título:
Acidity evolution on highly dispersed chromium supported on mesostructured silica: The effect of hydrothermal treatment and calcination temperature
Autor/es:
PARENTIS, MÓNICA L.; GONZO, ELIO E.; CUESTA ZAPATA, PABLO M.; BONINI, NORBERTO A.
Revista:
MICROPOROUS AND MESOPOROUS MATERIALS
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2020
ISSN:
1387-1811
Resumen:
Mesoporous Cr-MCM-41 catalysts were synthesized, under different hydrothermal temperatures, by the sol-gel procedure using tetraethylorthosilicate (TEOS) as silica precursor and cetyltrimethylammonium bromide (CTAB) as a structure-directing agent. Materials were characterized by several techniques (XRD, XPS, TG-DTA, FTIR, UV?Vis, AA and N2 sorptometry). The amount and accessibility of different hydroxyl groups were analyzed by FTIR spectroscopy after heat treatment in vacuum (10−5 mmHg) and subsequent exchange of hydrogen by deuterium using D2O. TG-DTA, FTIR of adsorbed pyridine and 2,6-dimethylpyridine and TPD of pyridine, let to determine the strength, thermal evolution, and amount of the different acid sites present at the surface. Results correlate with catalytic activity against 2-propanol in the gas phase, and let to propose mechanisms for dehydration and dehydrogenation reactions.
