Evaluating pore sizes in mesoporous materials: A simplified standard adsorption method and a simplified Broekhoff-de Boer method

被引：443

作者：

Lukens, WW

Schmidt-Winkel, P

Zhao, DY

Feng, JL

Stucky, GD ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Dept Chem, Santa Barbara, CA 93106 USA

[2] Univ Calif Santa Barbara, Mat Res Lab, Santa Barbara, CA 93106 USA

[3] Univ Calif Santa Barbara, Ctr Quantized Elect Struct, Santa Barbara, CA 93106 USA

来源：

LANGMUIR | 1999年 / 15卷 / 16期

关键词：

D O I：

10.1021/la990209u

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The diameters of primary mesopores in materials with well-defined cylindrical pores can be accurately determined by the 4V/A method when the volume and surface area are determined by a standard adsorption method and 13.5 Angstrom(2) is used as the molecular area of adsorbed nitrogen. A simple method for determining standard adsorption using the statistical thickness of the adsorbed gas layer defined by Frenkel-Halsey-Hill (FHH) theory is described. For materials in which the pores are not cylindrical or well-defined, a simplified Broekhoff-de Boer method can be used to determine pore dimensions. The use of Hill's approximation for the thickness of the adsorbed gas layer in the Broekhoff-de Boer method simplifies its use. The results of these methods on small pore MCM-41 materials, large pore SBA-15 materials, and spherical pore mesocellular foams are reported.

引用

页码：5403 / 5409

页数：7

共 44 条

[41] Catalytic hydroxylation of benzene over transition-metal substituted hexagonal mesoporous silicas [J].