skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Compositional heterogeneity of CrAPO-5 with neutral framework: Effect on sorption properties in comparison to other MeAPO-5 with charged frameworks and analytical evaluation of adsorption potentials

Abstract

Substitution of Cr{sup 3+} for Al{sup 3+} in AlPO{sub 4}-5 results in a material with a heterogeneity of composition and no framework charge. That compositional heterogeneity affects sorption properties generally in a similar way as the charged centers of the other substituted metal ions. A different influence of the neutral Cr centers can mainly be noticed for the sorbates with nonpolar molecules. Both types, i.e., neutral and charged heterocenters, cause a considerable increase of heterogeneity in relation to the inert sorbates. The controlling factors for the substitution of all investigated metals are the amount of metal, i.e., the number of heterocenters, and the distribution of the centers throughout the crystals. The latter has a higher importance for sorption of nonpolar sorbates. The kind of metal seems to play a secondary role. Adsorption potentials of low substituted materials are lower than that of AlPO{sub 4}-5 likely due to strong effects of localized sorption. The potentials follow the rising metal contents and achieve the value equal to AlPO{sub 4}-5 at the substitution level within the range between 0.5 and 0.65 Me/u.c. A further increase of the substitution leads to both the increase of adsorption potential and suppression of the effect of localizedmore » sorption on the isolated metal centers.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Univ. of Technology, Muenchen (DE)
OSTI Identifier:
20000524
Report Number(s):
CONF-9808111-
Journal ID: ISSN 0743-7463; LANGD5
Resource Type:
Journal Article
Journal Name:
Langmuir
Additional Journal Information:
Journal Volume: 15; Journal Issue: 18; Conference: Third international symposium on effects of surface heterogeneity in adsorption and catalysis on solids, Torun (PL), 08/09/1998--08/16/1998; Other Information: PBD: 31 Aug 1999; Journal ID: ISSN 0743-7463
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; MOLECULAR SIEVES; ALUMINIUM PHOSPHATES; SORPTIVE PROPERTIES; CHROMIUM; DOPED MATERIALS

Citation Formats

Kornatowski, J., Zadrozna, G., Wloch, J., and Rozwadowski, M. Compositional heterogeneity of CrAPO-5 with neutral framework: Effect on sorption properties in comparison to other MeAPO-5 with charged frameworks and analytical evaluation of adsorption potentials. United States: N. p., 1999. Web. doi:10.1021/la981419u.
Kornatowski, J., Zadrozna, G., Wloch, J., & Rozwadowski, M. Compositional heterogeneity of CrAPO-5 with neutral framework: Effect on sorption properties in comparison to other MeAPO-5 with charged frameworks and analytical evaluation of adsorption potentials. United States. doi:10.1021/la981419u.
Kornatowski, J., Zadrozna, G., Wloch, J., and Rozwadowski, M. Tue . "Compositional heterogeneity of CrAPO-5 with neutral framework: Effect on sorption properties in comparison to other MeAPO-5 with charged frameworks and analytical evaluation of adsorption potentials". United States. doi:10.1021/la981419u.
@article{osti_20000524,
title = {Compositional heterogeneity of CrAPO-5 with neutral framework: Effect on sorption properties in comparison to other MeAPO-5 with charged frameworks and analytical evaluation of adsorption potentials},
author = {Kornatowski, J. and Zadrozna, G. and Wloch, J. and Rozwadowski, M.},
abstractNote = {Substitution of Cr{sup 3+} for Al{sup 3+} in AlPO{sub 4}-5 results in a material with a heterogeneity of composition and no framework charge. That compositional heterogeneity affects sorption properties generally in a similar way as the charged centers of the other substituted metal ions. A different influence of the neutral Cr centers can mainly be noticed for the sorbates with nonpolar molecules. Both types, i.e., neutral and charged heterocenters, cause a considerable increase of heterogeneity in relation to the inert sorbates. The controlling factors for the substitution of all investigated metals are the amount of metal, i.e., the number of heterocenters, and the distribution of the centers throughout the crystals. The latter has a higher importance for sorption of nonpolar sorbates. The kind of metal seems to play a secondary role. Adsorption potentials of low substituted materials are lower than that of AlPO{sub 4}-5 likely due to strong effects of localized sorption. The potentials follow the rising metal contents and achieve the value equal to AlPO{sub 4}-5 at the substitution level within the range between 0.5 and 0.65 Me/u.c. A further increase of the substitution leads to both the increase of adsorption potential and suppression of the effect of localized sorption on the isolated metal centers.},
doi = {10.1021/la981419u},
journal = {Langmuir},
issn = {0743-7463},
number = 18,
volume = 15,
place = {United States},
year = {1999},
month = {8}
}