蒲公英状分级结构g-Al2O3颗粒的制备及其形成过程

›› 2011, Vol. 11 ›› Issue (3): 503-508.

蒲公英状分级结构g-Al2O3颗粒的制备及其形成过程

韩强武晓峰廖玉超李丹岳仁亮刘海弟陈运法

中国科学院过程工程研究所中国科学院过程工程研究所中国科学院过程工程研究所中国科学院过程工程研究所中国科学院过程工程研究所多相复杂系统国家重点实验室中国科学院过程工程研究所多相复杂系统国家重点实验室中国科学院过程工程研究所

收稿日期:2011-04-08 修回日期:2011-05-11 出版日期:2011-06-20 发布日期:2011-06-20
通讯作者: 武晓峰

Preparation and Evolution Process of Dandelion-like Hierarchical Boehmite Particles

HAN Qiang WU Xiao-feng LIAO Yu-chao LI Dan YUE Ren-liang LIU Hai-di CHEN Yun-fa

State Key Laboratory of Multi-phase Complex System, Institute of Process Engineering, Chinese Academy of Sciences State Key Laboratory of Multi-phase Complex System, Institute of Process Engineering, Chinese Academy of Sciences State Key Laboratory of Multi-phase Complex System, Institute of Process Engineering, Chinese Academy of Sciences State Key Laboratory of Multi-phase Complex System, Institute of Process Engineering, Chinese Academy of Sciences State Key Laboratory of Multi-Phase Complex Systern, Institute of Process Engineering, CAS State Key Laboratory of Multi-Phase Complex Systern, Institute of Process Engineering, CAS State Key Lab. Multiphase Complex System, Inst. Process Eng., Chinese Academy of Sciences

Received:2011-04-08 Revised:2011-05-11 Online:2011-06-20 Published:2011-06-20
Contact: WU Xiao-feng

摘要/Abstract

摘要： 以硝酸铝为铝源、尿素为沉淀剂、一水合柠檬酸为结构调控剂，采用水热法合成了具有分级结构的蒲公英状g-AlOOH颗粒，并经700℃煅烧4 h得到具有相同分级结构的g-Al2O3颗粒. 结果表明，样品由500 nm实心内核与松散的外层棒状结构组成，粒径约1 mm，比表面积为238.77 m2/g. 对比实验发现，柠檬酸在水热体系中可诱导薄水铝石形成球状颗粒，并在其不足量的情况下诱导产生棒状颗粒. 随反应进行，棒状颗粒在球状颗粒表面附着形成了具有分级结构的蒲公英状薄水铝石颗粒.

关键词: 水热法, 薄水铝石, 柠檬酸, 蒲公英状, g-氧化铝颗粒

Abstract: Hierarchical boehmite particles with dandelion-like morphology was synthesized in the hydrothermal condition using aluminum nitrate as Al3+ source, urea as precipitator and citric acid as structure directing agent, which was further transformed to g-Al2O3 product with the same morphology after simple heating post-treatment under 700℃ for 4 h. The crystal phase, morphology and microstructure of the samples were characterized. It is shown that the as-synthesized boehmite particles are 1 mm in diameter containing a solid interior with 500 nm in diameter and incompact outer shell formed by rod-shaped particles. The interesting dandelion-like structure evolution was further investigated by comparative experiments and a reasonable evolution mechanism was proposed, in which the boehmite samples tend to form spherical particles in the presence of citric acid, and rod-shaped particles can be produced when the citric acid is insufficient. The dandelion-like hierarchical boehmite particles are formed by rod-shaped particles adsorbed on the surface of the spherical particles.

Key words: hydrothermal method, boehmite, citric acid, dandelion-like morphology, g-alumina particles

中图分类号:

TF125

韩强武晓峰廖玉超李丹岳仁亮刘海弟陈运法. 蒲公英状分级结构g-Al2O3颗粒的制备及其形成过程[J]. , 2011, 11(3): 503-508.

HAN Qiang WU Xiao-feng LIAO Yu-chao LI Dan YUE Ren-liang LIU Hai-di CHEN Yun-fa. Preparation and Evolution Process of Dandelion-like Hierarchical Boehmite Particles[J]. , 2011, 11(3): 503-508.

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