CO2 absorption properties of Ti- and Na-doped porous Li4SiO4 prepared by a sol–gel process
CO2 absorption properties of Ti- and Na-doped porous Li4SiO4 prepared by a sol–gel process
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DOI：
10.1007/s10853-015-9020-2
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发表时间：
2015-04
影响因子：
4.5
通讯作者：
Maoqiao Xiang;Yingchun Zhang;M. Hong;Shuyan Liu;Yun Zhang;Hui Liu;Cheng Gu
中科院分区：
文献类型：
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作者：
Maoqiao Xiang;Yingchun Zhang;M. Hong;Shuyan Liu;Yun Zhang;Hui Liu;Cheng Gu
为改善正硅酸锂(Li4SiO4)的二氧化碳吸收性能，采用溶胶凝胶法制备了疏松多孔的片状Li4Si1−xTixO4和Li3.9Na0.1Si0.96Ti0.04O4。首次研究了钛掺杂与体积膨胀的关系。结果表明，钛的加入抑制了Li4SiO4晶体的生长，抑制了晶体的体积膨胀。X-射线衍射仪和扫描电子显微镜结果表明，前驱体在700℃热处理可以得到晶相相似、晶型不同的疏松多孔固溶体，其中Li_4Si_1-−_xTi_xO_4的最佳钛含量为Li_4Si0.96Ti0.04O_4。Li3.9Na0.1Si0.96Ti0.04O4的CO_2捕集性能优于Li4Si0.96Ti0.04O4。
To improve the carbon dioxide (CO2) absorption performance of lithium orthosilicate (Li4SiO4), tablet-like Li4Si1−xTixO4and Li3.9Na0.1Si0.96Ti0.04O4sorbents with loose and porous texture were prepared by a sol–gel process. The relationship between the Ti doping and volume expansion was studied for the first time. The results indicated that the Ti presence into the Li4SiO4structure inhibited the growth of grains and abated the volume expansion. The X-ray diffraction and scanning electron microscopy results showed that the loose and porous solid solutions with similar phase crystallite but different grain sizes could obtain by heat treatment of precursor at 700 °C. The optimum Ti content of Li4Si1−xTixO4seems to be 0.04 of Li4Si0.96Ti0.04O4. And the CO2capture behaviors of Li3.9Na0.1Si0.96Ti0.04O4were better than Li4Si0.96Ti0.04O4.