FTIR STUDY OF ADSORPTION ON SILICA GEL FOR ORGANIC SOLVENTS DILUTED IN SUPERCRITICAL CARBON DIOXIDE

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Physical adsorption on a silica gel (pore size of 80 nm, particle size of 10 <I>μ</I>m) has been studied for binary mixtures of methanol, acetone, and triethylamine diluted in supercritical CO<SUB>2</SUB> by use of a FTIR transmission technique. Measurements were made at 313.2 K and pressures up to 15 MPa. Vibrational frequencies of hydroxyl groups on the silica gel surface shift downward due to the hydrogen-bond formation with organic substances. As the pressure increases from 0.1 MPa, the integral absorbance of the hydrogen-bonded OH groups interacting with methanol or acetone increases at first, and reaches a maximum at a pressure below the critical pressure of CO<SUB>2</SUB>, and then the intensity decreases gradually with increasing pressure. Furthermore, both spectra of hydrogen-bonded OH groups of silica and C=O group of acetone show a slight frequency downshift with increasing pressure. On the other hand, the integral absorbance for triethylamine in CO<SUB>2</SUB> is almost constant from 0.1 to 15 MPa, indicating that most of the surface OH groups are covered by triethylamine molecules.

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  • Journal of chemical engineering of Japan

    Journal of chemical engineering of Japan 29(1), 139-145, 1996-02-20

    The Society of Chemical Engineers, Japan

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各種コード

  • NII論文ID(NAID)
    10003813623
  • NII書誌ID(NCID)
    AA00709658
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00219592
  • データ提供元
    CJP書誌  J-STAGE 
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