TY - JOUR
T1 - From amorphous to crystalline
T2 - Transformation of silica membranes into silicalite-1 (MFI) zeolite layers
AU - Karakiliç, Pelin
AU - Toyoda, Ryo
AU - Kapteijn, Freek
AU - Nijmeijer, Arian
AU - Winnubst, Louis
PY - 2019
Y1 - 2019
N2 - The transformation of microporous, amorphous silica membranes into b-oriented silicalite-1 (MFI) zeolite layers via in-situ crystallisation was investigated. The effect of synthesis parameters, such as the type and concentration of the silica precursor, crystallisation time and temperature, on the morphology of silicalite-1 (MFI) zeolite layers was studied. By optimizing these parameters, silicalite-1 zeolite layers were formed from the already-deposited silica layers, which promotes the crystallisation from the surface in the preferred b-orientation. The use of a monomeric silica precursor, which has slower hydrolysis kinetics than a colloidal one, resulted in the formation of zeolite crystals via heterogeneous nucleation on the surface and suppressed the formation of crystal nuclei in the liquid media via homogeneous nucleation, which then would further deposit onto the surface in a random orientation. Lastly, by optimizing the crystallisation time and temperature of the synthesis, thickness, coverage and orientation of silicalite-1 zeolite layers were controlled.
AB - The transformation of microporous, amorphous silica membranes into b-oriented silicalite-1 (MFI) zeolite layers via in-situ crystallisation was investigated. The effect of synthesis parameters, such as the type and concentration of the silica precursor, crystallisation time and temperature, on the morphology of silicalite-1 (MFI) zeolite layers was studied. By optimizing these parameters, silicalite-1 zeolite layers were formed from the already-deposited silica layers, which promotes the crystallisation from the surface in the preferred b-orientation. The use of a monomeric silica precursor, which has slower hydrolysis kinetics than a colloidal one, resulted in the formation of zeolite crystals via heterogeneous nucleation on the surface and suppressed the formation of crystal nuclei in the liquid media via homogeneous nucleation, which then would further deposit onto the surface in a random orientation. Lastly, by optimizing the crystallisation time and temperature of the synthesis, thickness, coverage and orientation of silicalite-1 zeolite layers were controlled.
KW - In-situ crystallisation
KW - MFI zeolite
KW - Silica transformation
KW - Silicalite-1
KW - Sol-gel
UR - http://resolver.tudelft.nl/uuid:a2338948-337e-4ff3-8bd1-a01e168cf987
UR - http://www.scopus.com/inward/record.url?scp=85054104693&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2018.09.020
DO - 10.1016/j.micromeso.2018.09.020
M3 - Article
AN - SCOPUS:85054104693
SN - 1387-1811
VL - 276
SP - 52
EP - 61
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
ER -