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  Oil Shale

ISSN 1736-7492 (electronic)  ISSN 0208-189X (print)
Published since 1984

Oil Shale

ISSN 1736-7492 (electronic)  ISSN 0208-189X (print)
Published since 1984

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TECHNIQUE OF PREPARING MODIFIED SILICA FROM OIL SHALE RESIDUE; pp. 309–320

(Full article in PDF format) doi: 10.3176/oil.2011.2.05


Authors

XU YING-MEI, QI JI, SHI JIA-WEI, HE DE-MIN, WANG DONG-MEI, ZHANG QIU-MIN

Abstract

The raw material – residue of oil production from Huadian oil shale – was modified with cationic surfactants; the hydroxyl groups on the aggregated silica surface were alkylated directly. The structure of alkylated Si-hydroxyl on modified silica surface was characterized by means of infrared spectro­scopy, nuclear magnetic resonance analysis, thermal gravimetric analysis and scan­ning electron microscopy analysis. The results showed that modifica­tion rate of hydroxyl groups on the surface of the modified silica obtained was about 84%. The modification conditions were optimized basing on application of the orthogonal experimental method, and the optimum parameters were as follows: the reaction temperature of water medium – 40 °C, pH value within the range of 9–10, and the molar ratio of cationic surfactant to silica hydroxyl on the surface – 2:1.

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