组合处理工艺下硅藻土微观组织演变及孔隙结构变化  

Microstructure Evolution and Pore Structure Change of Diatomite under Combined Treatment

作　　者：戴时雨 郝春来 齐鹏远[1] 王刚[1] 赵美 马伟民[1] 朱广超 田怡然 李莹 DAI Shiyu;HAO Chunlai;QI Pengyuan;WANG Gang;ZHAO Mei;MA Weimin;ZHU Guangchao;TIAN Yiran;LI Ying(Department of Materials Science and Engineering,Yingkou Institute of Technology,Yingkou 115014,China)

机构地区：[1]营口理工学院材料与科学工程学院,营口115014

出　　处：《硅酸盐通报》2022年第6期2209-2216,共8页Bulletin of the Chinese Ceramic Society

基　　金：辽宁省自然科学基金计划项目(2021YKLH10);辽宁省教育厅科学研究资助项目(L2019005);营口理工学院引进人才科研启动经费项目(YJRC202017);沈阳市先进陶瓷制备技术及应用重点实验室建设资助项目(F12259100)。

摘　　要：将硅藻土制成硅藻土/分子筛复合材料,其比表面积和吸附能力将显著提高。本文利用水洗-烧结-酸性水热系列组合处理工艺制备硅藻土/磷酸铝分子筛复合材料,同时验证外加铝源形成磷酸铝分子筛的可行性,探讨高品质硅藻土形成时的微观组织演变行为及孔隙结构变化规律。结果表明:硅藻土的孔隙结构包括大孔、介孔和少量的微孔结构,水洗处理仅有物理提纯作用;500℃烧结可以疏通硅藻土壳体的孔洞,但烧结温度过高会导致管状结构的坍塌;酸性水热处理能够合成具有介孔结构的磷酸铝分子筛,而且随着外加铝源的加入,硅藻土/分子筛复合材料中磷酸铝分子筛含量增加,当外加铝源为硅藻土中铝含量的1.5倍时,其比表面积和吸附性能达到最大。If diatomite is made into diatomite/molecular sieve composites,its specific surface area and adsorption capacity will be significantly improved.In this paper,diatomite/aluminum phosphate molecular sieve composites were prepared by a series of combined treatment processes of washing,sintering and acid hydrothermal treatment,and the feasibility of forming aluminum phosphate molecular sieve was verified by adding aluminum source,and the microstructure evolution behavior and pore structure change law during the formation of high-quality diatomite were discussed.The results show that the pore structure of diatomite includes macroporous,mesoporous and a small amount of microporous structure.Sintering at 500℃dredge the holes of diatomite shell,but too high sintering temperature lead to the collapse of tubular structure.The aluminum phosphate molecular sieves with mesoporous structure are synthesized by acidic hydrothermal treatment.With the addition of aluminum source,the content of aluminum phosphate molecular sieves in diatomite/molecular sieve composites increases.When the aluminum source is 1.5 times of aluminum content in diatomite,the specific surface area and adsorption performance reach the maximum.

关 键 词：硅藻土 酸性水热处理 硅藻土/磷酸铝分子筛 组织演变 孔隙结构 

分 类 号：TB383[一般工业技术—材料科学与工程] TQ422[化学工程]