原位反应烧结合成针状结构多孔莫来石载体

doi:10.3724/SP.J.1077.2008.00597

无机材料学报

原位反应烧结合成针状结构多孔莫来石载体

陈纲领, 漆虹, 邢卫红, 徐南平

南京工业大学膜科学技术研究所, 材料化学工程国家重点实验室, 南京 210009

收稿日期:2007-07-08 修回日期:2007-08-26 出版日期:2008-05-20 网络出版日期:2008-05-20

In situ Reaction Synthesis of Needle-like Macroporous Mullite Supports

CHEN Gang-Ling, QI Hong, XING Wei-Hong, XU Nan-Ping

Membrane Science & Technology Research Center, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China

Received:2007-07-08 Revised:2007-08-26 Published:2008-05-20 Online:2008-05-20

摘要/Abstract

摘要： 采用粘土矿物高岭土、Al₂O₃ 和 Al(OH)₃为原料, 原位反应烧结合成了针状结构多孔莫来石陶瓷膜载体. 考察了不同铝源的添加对针状结构多孔莫来石载体形成的影响, 并对其形成机制进行了研究. 研究结果表明: 针状结构莫来石形成机制为气固反应, 在针状结构莫来石形成前有氟黄玉生成, 并且与氟黄玉的生成量密切相关. 以Al(OH)₃ 作为添加铝源的组成中氟黄玉更容易生成, 并且随AlF₃含量的增加而增加, 在随后烧成过程中转化为具有刚性骨架的针状结构莫来石, 从而使多孔载体具有较高的孔隙率(>35%)和相对高的孔径(1.5μm).

关键词: 莫来石, 针状结构, 多孔载体, 原位反应烧结

Abstract: The needle-like structured porous mullite ceramic membrane supports were prepared using kaolin, Al₂O₃ and Al(OH)₃ as raw materials by in ~situ reaction sintering. Al₂O₃/kaolin and Al(OH)₃/kaolin mixtures with different contents of AlF₃ additives were selected, respectively. The effects of different aluminium resources and doping amount of the additives on the needle like structured macroporous mullite support formation were investigated. Results show that topaz is formed prior to the formation of needle-like mullite and the needle-like mullite formation is closely related to the topaz content in samples. Formation mechanism of needle-like mullite is vapor-solid reaction mechanism. The needle-like structured porous mullite support with porosity of more than 35% and average pore size of 1.5μm is more easily prepared using the Al(OH)₃/kaolin mixture as raw materials, and it’s quantity increases with the AlF₃ content increasing.

Key words: mullite, needle-like, porous support, in situ reaction sintering

中图分类号:

TQ174

陈纲领,漆虹,邢卫红,徐南平. 原位反应烧结合成针状结构多孔莫来石载体[J]. 无机材料学报, DOI: 10.3724/SP.J.1077.2008.00597.

CHEN Gang-Ling,QI Hong,XING Wei-Hong,XU Nan-Ping. In situ Reaction Synthesis of Needle-like Macroporous Mullite Supports[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.00597.

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原位反应烧结合成针状结构多孔莫来石载体

In situ Reaction Synthesis of Needle-like Macroporous Mullite Supports

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