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Adsorption--desorption of water vapor by natural and heat-treated sepiolite in ambient air

机译:天然海泡石和热处理海泡石在环境空气中的吸附-解吸水蒸气

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A sepiolite from Yunclillos (Spain) has been heat--treated in air in the temperature range of 110--500deg.C. The heat treatment up to 200deg.C does not modify the volume of dricropores or the non-microporous surface area of the original sepiolite. As the temperature of the heat treatment increases to 500deg.C there is a decrease in the non-microporous surface area and a loss of microporosity, the original structure not being restored after rehydration for sepiolite heat-treated at 400 and 500deg.C. In order to analyze the behavior of sepiolite as controller of humidity, worlding cycles of 24 h with variable temperature and relative humidity (RH) have been simulated and the experimental results have been compared with the adsorption isotherms of water vapor in air. These isotherms are a very good guide to predict the amount of water that the sepiolite can retain--liberate when the RH of the air is modified. Considering the shape of the isotherms, showing a faster increase in the amount of water retained at RH > 50/100, it is possible to deduce that sepiolite will be especially useful as controller of humidity in environments where the RH is usually very high (80--90/100) and sporadically is considerably decreased (below 60/100). On the other hand, the thermal treatment of sepiolite at 500deg.C does not improve the capacity to control the humidity of the environment.
机译:来自Yunclillos(西班牙)的海泡石在空气中于110--500°C的温度范围内进行了热处理。高达200℃的热处理不会改变原始海泡石的小孔的体积或无微孔表面积。随着热处理温度升高至500℃,非微孔表面积减小并且微孔率降低,对于在400和500℃热处理的海泡石,在水合后不能恢复原始结构。为了分析海泡石作为湿度控制器的行为,模拟了在24小时内温度和相对湿度(RH)可变的持续周期,并将实验结果与空气中水蒸气的吸附等温线进行了比较。这些等温线是预测海泡石可以保留的水量的很好的指南-当改变空气的相对湿度时,海泡石可以释放。考虑到等温线的形状,表明在RH> 50/100时保水量的增加更快,可以推断出海泡石在RH通常很高的环境中特别可用作湿度控制剂(80 --90 / 100)并偶尔减少(低于60/100)。另一方面,在500℃下对海泡石进行热处理并不能提高控制环境湿度的能力。

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