Pore size analysis of MCM-41 type adsorbents by means of nitrogen and argon adsorption

被引:309
作者
Neimark, AV
Ravikovitch, PI
Grun, M
Schuth, F
Unger, KK
机构
[1] TRI Princeton, Princeton, NJ 08542 USA
[2] Yale Univ, Dept Chem Engn, New Haven, CT 06520 USA
[3] Johannes Gutenberg Univ Mainz, Inst Anorgan Chem & Analyt Chem, D-55128 Mainz, Germany
[4] Goethe Univ Frankfurt, Inst Anorgan Chem, D-60439 Frankfurt, Germany
关键词
adsorption; density functional theory; capillary condensation; hysteresis; MCM-41; pore size distribution; isosteric heat;
D O I
10.1006/jcis.1998.5748
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Methods of nonlocal density functional theory (NLDFT), proposed recently for predictions of adsorption equilibrium and calculations of pore size distributions in micro- and mesoporous materials, were tested on reference MCM-41 materials, Five newly synthesized MCM-41 adsorbents with presumably uniform pore channels varying from 32 to 45 Angstrom were characterized by X-ray diffraction (XRD), nitrogen adsorption at 77 K, and argon adsorption at 77 and 87 K, New sets of intermolecular interaction parameters of the NLDFT model for N(2) and Ar adsorption on MCM-41 were determined, The parameters were specified to reproduce the bulk liquid-gas equilibrium densities and pressures, liquid-gas interfacial tensions, and standard adsorption isotherms on nonporous surfaces in the multilayer adsorption region, The pore size distributions calculated from the desorption branches of the experimental isotherms measured at three different temperatures were consistent with each other. Comparison of the NLDFT-calculated pore sizes with XRD data showed that the thickness of pore walls in the MCM-41 samples under consideration varied from ca, 6 to 12 Angstrom. We found no correlation between the pore size and the pore wall thickness, The results obtained support the NLDFT model as a suitable tool for characterizing nanoporous materials and predicting adsorption equilibrium, The MCM-41 samples studied can be used as references for adsorption measurements. (C) 1998 Academic Press.
引用
收藏
页码:159 / 169
页数:11
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