Organic modification of FSM-type mesoporous silicas derived from kanemite by silylation

被引:86
作者
Kimura, T
Saeki, S
Sugahara, Y
Kuroda, K
机构
[1] Waseda Univ, Dept Appl Chem, Shinjuku Ku, Tokyo 1698555, Japan
[2] Waseda Univ, Kagami Mem Lab Mat Sci & Technol, Shinjuku Ku, Tokyo 1690051, Japan
关键词
D O I
10.1021/la9815042
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Two kinds of FSM-type mesoporous silicas with different OH densities were prepared by calcination and acid treatment and modified with various silylating agents. The density of silanol groups in acid-treated FSM was about 1.5 times as large as that in calcined FSM (2.4 OH groups nm(-2)), determined by thermogravimetry and Si-29 MAS NMR. When calcined FSM was trimethylsilylated, 73% of the surface was covered with trimethylsilyl (TMS) groups. With the increase in the alkyl chain length of chloroalkyldimethylsilanes, the pore diameter of silylated FSM-type mesoporous silicas decreased. The silylated FSM-type mesoporous silicas possessed extremely hydrophobic pores. The hydrophobicity of the surfaces was also changed by using aminopropylethoxysilanes. In contrast, when the acid-treated FSM was silylated with chlorotrimethylsilane, TMS groups came into contact with one another (surface coverage ca. 100%) because of the presence of a larger amount of silanol groups. Moreover, the sensitive control of the pore size by silylation reaction was achieved by varying a grafted number of octyldimethylsilyl (ODMS) groups. ODMS groups were located near the inner surfaces in the mesoporous silica silylated in a lesser degree, and the groups were directed toward the center of mesopores in the fully silylated mesoporous silica.
引用
收藏
页码:2794 / 2798
页数:5
相关论文
共 27 条
[1]   Enhanced catalytic activity of MCM-41-grafted aluminium isopropoxide in MPV reductions [J].
Anwander, R ;
Palm, C ;
Gerstberger, G ;
Groeger, O ;
Engelhardt, G .
CHEMICAL COMMUNICATIONS, 1998, (17) :1811-1812
[2]   Synthesis and structural characterisation of rare-earth bis(dimethylsilyl)amides and their surface organometallic chemistry on mesoporous MCM-41 [J].
Anwander, R ;
Runte, O ;
Eppinger, J ;
Gerstberger, G ;
Herdtweck, E ;
Spiegler, M .
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS, 1998, (05) :847-858
[3]   Grafting of versatile lanthanide silylamide precursors onto mesoporous MCM-41 [J].
Anwander, R ;
Roesky, R .
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS, 1997, (02) :137-138
[4]   Sorption of nitrogen, water vapor, and benzene by a phenyl-modified MCM-41 sorbent [J].
Bambrough, CM ;
Slade, RCT ;
Williams, RT ;
Burkett, SL ;
Sims, SD ;
Mann, S .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1998, 201 (02) :220-222
[5]   A NEW FAMILY OF MESOPOROUS MOLECULAR-SIEVES PREPARED WITH LIQUID-CRYSTAL TEMPLATES [J].
BECK, JS ;
VARTULI, JC ;
ROTH, WJ ;
LEONOWICZ, ME ;
KRESGE, CT ;
SCHMITT, KD ;
CHU, CTW ;
OLSON, DH ;
SHEPPARD, EW ;
MCCULLEN, SB ;
HIGGINS, JB ;
SCHLENKER, JL .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1992, 114 (27) :10834-10843
[6]   Monoglyceride synthesis by heterogeneous catalysis using MCM-41 type silicas functionalized with amino groups [J].
Cauvel, A ;
Renard, G ;
Brunel, D .
JOURNAL OF ORGANIC CHEMISTRY, 1997, 62 (03) :749-751
[7]  
Chen JS, 1995, ANGEW CHEM INT EDIT, V34, P2694
[8]   From microporous to mesoporous molecular sieve materials and their use in catalysis [J].
Corma, A .
CHEMICAL REVIEWS, 1997, 97 (06) :2373-2419
[9]   Immobilization of cobalt complexes on mesoporous MCM-41 support materials [J].
Diaz, JF ;
Bedioui, F ;
Briot, E ;
Devynck, J ;
Balkus, KJ .
MICROPOROUS AND MACROPOROUS MATERIALS, 1996, 431 :89-94
[10]   Functionalized monolayers on ordered mesoporous supports [J].
Feng, X ;
Fryxell, GE ;
Wang, LQ ;
Kim, AY ;
Liu, J ;
Kemner, KM .
SCIENCE, 1997, 276 (5314) :923-926