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硅酸盐学报 2011

煅烧凹凸棒石的水化处理对其结构演化和吸附NH3的影响

孔德军,陈天虎,刘海波,陈冬,谢晶晶,庆承松

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Abstract:

采用X射线衍射分析了煅烧凹凸棒石的水化处理对其结构演化的影响；通过NH3吸附试验表征煅烧凹凸棒石水化处理后表面性质的变化，揭示了凹凸棒石对NH3的吸附机理。结果表明随着煅烧温度的不断提高，凹凸棒石中的结晶水和结构水逐步脱除，内孔道结构发生折叠塌陷，凹凸棒石的内孔道折叠温度在250～300℃之间，只有低于300℃煅烧的凹凸棒石经过水化处理折叠的内孔道才能恢复。凹凸棒石经过200～300℃煅烧再水化处理，对NH3的吸附量比未处理的凹凸棒石显著增加，尤其是250℃煅烧的凹凸棒石经水化处理后对NH3的吸附量增加了75%，250℃是煅烧凹凸棒石水化处理吸附NH3的最佳温度点。低于300℃煅烧的凹凸棒石水化处理恢复了部分结晶水，推测NH3与这部分结晶水发生了氢键作用，凹凸棒石对NH3的吸附既有外表面吸附，又有内孔道吸附。

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