Amine-modified silicas: Thermal stability and adsorption of gases |
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| Authors: | L D Belyakova G A Gerasimova L T Zhuravlev G V Kudryavtsev G V Lisichkin N S Ovchinnikova N P Platonova T I Shevchenko |
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| Institution: | 1. Institute of Physical Chemistry, Academy of Sciences of the USSR, Moscow
2. M. V. Lomonosov State University, Moscow
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| Abstract: | | 1. |
When silicas are modified with amines, not all surface silanol groups participate in the chemical reaction.
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When amine-modified silica gels are heated, water is produced; the maximum rate of the formation of gas occurs at 625 and 750 K. Destruction of the modifying layer begins with the liberation of ammonia at T > 640 K.
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Adsorption of SO2 and CO2 on aminated silicas is determined by the surface concentration of amino groups, by their nature, and by their mutual position.
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Translated from Izvestiya Akademiya Nauk SSSR, Seriya Khimicheskaya, No. 5, pp. 983–990, May, 1989. |
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