Preparation and characterization of silica aerogels from oil shale ash
Preparation and characterization of silica aerogels from oil shale ash
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DOI：
10.1016/j.matlet.2009.09.053
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发表时间：
2009-12
影响因子：
3
通讯作者：
Guimei Gao;L. Miao;G. Ji;H. Zou;S. Gan
中科院分区：
文献类型：
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作者：
Guimei Gao;L. Miao;G. Ji;H. Zou;S. Gan
使用油页岩灰成功合成了二氧化硅气凝胶，油页岩灰是通过常压干燥加工油页岩的副产品。对二氧化硅气凝胶的物理和结构特性进行了研究和讨论。结果表明，水凝胶的有机改性是在常压干燥中保留中孔的加工过程中的关键步骤。未改性的水凝胶在干燥过程中经历了巨大的收缩并产生了微孔二氧化硅气凝胶。采用这种新颖的路线，可以生产出具有非常低的振实密度（0.074g/cm3）、高比表面积（909m2/g）和累积孔容（2.54cm3/g）的二氧化硅气凝胶。从工业化角度来看，本工艺非常适合大规模生产粉状二氧化硅气凝胶。为解决油页岩灰分污染问题提供了新途径。
The silica aerogels were successfully synthesized using oil shale ash which is a by-product of oil shale processing via ambient pressure drying. The physical and textural properties of the silica aerogels have been investigated and discussed. The results showed that the organic modification of hydrogels was a crucial step during the processing which preserved mesopores in ambient pressure drying. The unmodified hydrogel underwent tremendous shrinkage during the drying and yielded microporous silica aerogel. Using this novel route, it could produce silica aerogel with very low tapping density of 0.074g/cm3, high specific surface (909m2/g) and cumulative pore volume of 2.54cm3/g. From the industrial point of view, the present process is quite suitable for a large scale production of powdered silica aerogel. Furthermore, it provides a new way to solve the problem of oil shale ash pollution.