Alkaline-Earth Oxide Nanoparticles Obtained by Aerogel Methods. Characterization and Rational for Unexpectedly High Surface Chemical Reactivities Full article
Journal |
Chemistry of Materials
ISSN: 0897-4756 , E-ISSN: 1520-5002 |
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Output data | Year: 1997, Volume: 9, Number: 11, Pages: 2468-2480 Pages count : 13 DOI: 10.1021/cm970357a | ||
Tags | MAGNESIUM-OXIDE; CALCIUM-OXIDE; CARBON-DIOXIDE; DESTRUCTIVE ADSORPTION; SULFUR-DIOXIDE; REAGENTS; PARTICLES; CATALYSTS; PYRIDINE; DECOMPOSITION | ||
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Abstract:
Aerogel preparation of MgO and CaO nanoparticles involves a sol−gel approach where methoxides are converted to hydroxide gels followed by hypercritical drying and vacuum dehydration. This produces, for these particular hydroxides/oxides, ultrafine particulates rather than monoliths. These particulate materials have exhibited unexpectedly high surface chemical reactivities that have allowed their successful use as high-capacity destructive adsorbents for toxic chemicals, including chlorocarbons, organophosphorus compounds, and acid gases. Detailed characterization involving X-ray diffraction (XRD), gas adsorption/pore distribution analysis, infrared, TEM, AFM, XPS, probe molecule adsorption, and elemental analysis has allowed a rationale to be developed that helps explain the high chemical reactivities observed, especially for CaO. Pore volume and size distribution, unusual surface morphologies with a high ratio of edge ion/surface ions, and trace residual (persistent) surface −OH and −OCH3 seem to be the main factors allowing these nanoparticulates to be isolable and stable and yet highly reactive, and results for CaO are emphasized herein.
Cite:
Koper O.B.
, Lagadic I.
, Volodin A.
, Klabunde K.J.
Alkaline-Earth Oxide Nanoparticles Obtained by Aerogel Methods. Characterization and Rational for Unexpectedly High Surface Chemical Reactivities
Chemistry of Materials. 1997. V.9. N11. P.2468-2480. DOI: 10.1021/cm970357a WOS Scopus РИНЦ
Alkaline-Earth Oxide Nanoparticles Obtained by Aerogel Methods. Characterization and Rational for Unexpectedly High Surface Chemical Reactivities
Chemistry of Materials. 1997. V.9. N11. P.2468-2480. DOI: 10.1021/cm970357a WOS Scopus РИНЦ
Dates:
Submitted: | May 12, 1997 |
Accepted: | Sep 23, 1997 |
Published print: | Nov 1, 1997 |
Identifiers:
Web of science | WOS:A1997YH44500027 |
Scopus | 2-s2.0-0000844008 |
Elibrary | 13759087 |
Chemical Abstracts | 1997:721262 |
Chemical Abstracts (print) | 128:40033 |
OpenAlex | W2038635137 |