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化工学报  2015 

纳米锑掺杂氧化锡制备中超临界CO2干燥的工艺优化及动力学

DOI: 10.11949/j.issn.0438-1157.20141358, PP. 1593-1599

Keywords: ATO,超临界CO2,醇凝胶,工艺优化,动力学,模型

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Abstract:

纳米锑掺杂氧化锡(ATO)具有优越的光电性能,在制备过程中前驱体干燥处理至关重要。为掌握ATO前驱体的超临界CO2干燥工艺特性,研究了超临界干燥的时间、温度、压力和CO2流量等工艺参数对纳米ATO粒径、比表面积等的影响,进一步探讨了超临界CO2流量对干燥动力学的影响规律,并拟合了干燥曲线方程。结果表明:温度35~40℃、压力10~14MPa、CO2流量1.2~1.8L·h-1、干燥5~6h,最终能够获得平均粒径20~30nm、高比表面积的纳米ATO材料;流量对干燥速率有明显影响,醇分比0.4为干燥速率由恒速转为降速的临界点,醇凝胶干燥动力学方程能够很好地描述ATO醇凝胶干燥工艺过程。研究结果可为湿法制备纳米材料的湿凝胶干燥工业化生产和控制提供参考。

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