Hydrothermal synthesis of mesoporous materials from diatomaceous earth
Hydrothermal synthesis of mesoporous materials from diatomaceous earth
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DOI：
10.1002/aic.11235
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发表时间：
2007-08
期刊：
影响因子：
3.7
通讯作者：
Z. Jing;H. Maeda;K. Ioku;E. H. Ishida
中科院分区：
文献类型：
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作者：
Z. Jing;H. Maeda;K. Ioku;E. H. Ishida
以硅藻土为原料，在393 ~ 473 K的饱和蒸汽压力下（0.2 ~ 1.56 MPa），引入熟石灰，水热合成介孔材料72 h。在水热合成过程中，水合硅酸钙（CSH）是第一个形成的相，并且总是先于托贝莫来石出现。CSH的形成初期似乎对强度发展和孔径演化有积极影响；而托伯莫里石的形成则进一步增强了强度，缩小了孔隙尺寸。在473 K固化18 h时，强度和孔径分布趋于最佳，孔径分布也在介孔区（直径2 ~ 50 nm）之间。在本研究中，水热处理过程中合成的多孔材料的强度最高，孔径分布也最细。©2007美国化学工程师学会，2007
Hydrothermal synthesis of mesoporous materials from diatomaceous earth has been carried out under saturated steam pressure (0.2–1.56 MPa) at 393–473 K for up to 72 h by slaked lime introduction. During the hydrothermal synthesis process, calcium silicate hydrate (CSH) was among the first phase formed and invariably appeared before tobermorite. The CSH formation seemed to exert a positive effect on the strength development and pore size evolution initially; whilst the tobermorite formation appeared to further enhance the strength and narrow the pore size. With curing at 473 K for 18 h, both of the strength and pore size distribution tended to reach optimal at which the pore size distribution also ranges between mesoporous area (2–50 nm in diameter). The highest strength seemed to coincide with the finest pore size distribution of the synthesized porous material during hydrothermal processing in this study. © 2007 American Institute of Chemical Engineers AIChE J, 2007