TY - JOUR
T1 - Study of cloverite molecular sieves modified by grafting organometallic complexes inside the pores
T2 - II. Adsorption properties of cloverite modified by grafting -SnR3 fragments (R=Me, Et, nBu, Cy)
AU - Adachi, M.
AU - Corker, J.
AU - Kessler, H.
AU - De Mallmann, A.
AU - Lefebvre, F.
AU - Basset, J. M.
N1 - Funding Information:
The authors wish to acknowledge Dr. A. Choplin for fruitful discussions and Mr. K. Mizukami of Miyamoto Laboratory, Tohoku University for the calculations with the Pore Access software. The European Community is gratefully acknowledged for a financial support (EEC contract 93-0280). One author (M.A.) thanks the Ministère de l'Enseignement Supérieur et de la Recherche (French government) for a financial support during her PhD. course.
PY - 1999/3
Y1 - 1999/3
N2 - The adsorption properties of as-synthesized cloverite and of cloverite modified by grafting -SnR3 (R=Me, Et, nBu, Cy) organometallic tin complexes were studied by a volumetric method. Three hydrocarbons, n-hexane, benzene and iso-octane, were investigated. The adsorption capacities of unmodified cloverite correspond to a filling of the 20 T channel system for benzene and iso-octane, and to a filling of the 8 T and 20 T channel systems for n-hexane. Grafting -SnCy3 fragments onto the external surface of cloverite has no effect on the adsorption capacities of the three hydrocarbons but decreases significantly the diffusion rate of iso-octane. In contrast, the adsorption capacities of cloverite modified by -SnR3 fragments grafted inside the crystal (R=Et, nBu: one fragment per window of the supercage; R=Me: 4 fragments per window) are completely modified: (i) iso-octane is completely excluded from the pore channels, due to steric constraints; (ii) n-hexane can only fill the 20 T pore channel system, and (iii) the decrease of the pore volume by grafting the organometallic fragment results in a reduction of the adsorption capacities of n-hexane and benzene.
AB - The adsorption properties of as-synthesized cloverite and of cloverite modified by grafting -SnR3 (R=Me, Et, nBu, Cy) organometallic tin complexes were studied by a volumetric method. Three hydrocarbons, n-hexane, benzene and iso-octane, were investigated. The adsorption capacities of unmodified cloverite correspond to a filling of the 20 T channel system for benzene and iso-octane, and to a filling of the 8 T and 20 T channel systems for n-hexane. Grafting -SnCy3 fragments onto the external surface of cloverite has no effect on the adsorption capacities of the three hydrocarbons but decreases significantly the diffusion rate of iso-octane. In contrast, the adsorption capacities of cloverite modified by -SnR3 fragments grafted inside the crystal (R=Et, nBu: one fragment per window of the supercage; R=Me: 4 fragments per window) are completely modified: (i) iso-octane is completely excluded from the pore channels, due to steric constraints; (ii) n-hexane can only fill the 20 T pore channel system, and (iii) the decrease of the pore volume by grafting the organometallic fragment results in a reduction of the adsorption capacities of n-hexane and benzene.
KW - Adsorption
KW - Alkyltin
KW - Cloverite
KW - Molecular sieves
UR - http://www.scopus.com/inward/record.url?scp=0032664323&partnerID=8YFLogxK
U2 - 10.1016/S1387-1811(98)00297-2
DO - 10.1016/S1387-1811(98)00297-2
M3 - Article
AN - SCOPUS:0032664323
SN - 1387-1811
VL - 28
SP - 155
EP - 162
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
IS - 1
ER -