Influence of the synthesis conditions on the incorporation of B and the acidity in BMCM-

ELIANA G. VASCHETTO; GINA PECCHI; SANDRA G. CASUSCELLI; EIMER GRISELDA A.

MICROPOROUS AND MESOPOROUS MATERIALS

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2016

1387-1811

p style="margin: 0cm 0cm 0pt; text-align: justify; line-height: 150%;">B-MCM-41 typenano-structured materials were prepared by direct hydrothermal synthesis. Thetime of hydrothermal treatment, the Si/B initial molar ratio and the nature ofthe hydroxide source in the synthesis process were analyzed. All the materialswere characterized by XRD, N2 adsorption, TEM, SEM, ICP-OES, FT-IRand adsorption of pyridine coupled to FT-IR spectroscopy. The role of hydroxidesource is essential to achieve the incorporation of boron in the mesoporousstructure. The relationship between the Boron content in the synthesis gel, thedegree of introduction of tetra-coordinated B into the framework, the formationof nest silanols and the relative density of the acidic sites have been discussed.We could corroborate that hydroxyl groups present in silanol nests are thedirect responsible of the moderate Brønsted acidity of our