ADSORPTION BY MFI-TYPE ZEOLITES EXAMINED BY ISOTHERMAL MICROCALORIMETRY AND NEUTRON-DIFFRACTION .2. NITROGEN AND CARBON-MONOXIDE

被引：107

作者：

LLEWELLYN, PL

COULOMB, JP

GRILLET, Y

PATARIN, J

ANDRE, G

ROUQUEROL, J

机构：

[1] FAC SCI LUMINY,CNRS,CRMC,F-13288 MARSEILLE 9,FRANCE

[2] UNIV HAUTE ALSACE,MAT MINERAUX LAB,F-68093 MULHOUSE,FRANCE

[3] CENS,LAB LEON BRILLOUIN,F-91191 GIF SUR YVETTE,FRANCE

来源：

LANGMUIR | 1993年 / 9卷 / 07期

关键词：

Adsorption - Calorimetry - Carbon monoxide - Microanalysis - Neutron diffraction - Nitrogen;

D O I：

10.1021/la00031a037

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Physisorption of nitrogen and carbon monoxide on a series of MFI-type zeolites with varying Si/Al ratios was examined by isothermal volumetry and microcalorimetry with reference to a neutron diffraction study of nitrogen adsorption on silicalite-I. The adsorption of both molecules occurs by site. For samples with a high Si/Al ratio (>120), two adsorbate phase transitions could be distinguished for both adsorptives, corresponding to a ''disordered phase'' (presumably a fluid) to ''lattice fluidlike'' and then to a ''crystalline-like solid phase''. The former transition was indistinguishable for the other samples; however the latter was observed at lower pressures and more diffuse with decreasing Si/Al ratio.

引用

页码：1852 / 1856

页数：5