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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

表面活性剂辅助水热热分解法制备介孔氧化铝纤维

朱振峰, 孙洪军, 刘 辉, 杨 冬, 张建权, 郭丽英   

  1. （陕西科技大学 材料科学与工程学院, 西安 710021）
  • 收稿日期:2009-01-13 修回日期:2009-04-20 出版日期:2009-09-20 网络出版日期:2009-09-20

Surfactant Assisted Hydrothermal and Thermaldecomposition Synthesis
of Alumina Microfibers with Mesoporous Structures

ZHU Zhen-Feng, SUN Hong-Jun, LIU Hui, YANG Dong,ZHANG Jian-Quan,GUO Li-Ying   

  1. (School of Materials Science and Engineering, University of Science and Technology, Xi’an 710021, China)
  • Received:2009-01-13 Revised:2009-04-20 Published:2009-09-20 Online:2009-09-20

PDF (PC)

1860

被引次数

69 | 5

摘要： 以PEG(Mn=20000)为模板导向剂, 尿素为沉淀剂, 采用水热热分解法制备了纳米介孔结构的氧化铝纤维, 并对其吸附性能进行了研究. 通过X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、热释重仪(TGA)和N2等温脱附-吸附分析, 考察了介孔氧化铝纤维的相态、结构、形貌、比表面积和介孔特征. 采用选择性催化还原(SCR)烟气脱硝装置对其吸附性能进行了研究. 结果表明：以PEG为模板, 采用简单的水热法就可得到直径(200～300)nm×(8～10)μm的碳酸铝铵纤维; 经900℃煅烧2h得到比表面积为316m2/g、平均孔径为2.5nm的η-Al2O3介孔纤维, 形貌基本不发生变化; SCR烟气脱硝测试显示, 相比商品氧化铝粉末, 合成的氧化铝介孔纤维有着更强的吸附性能, 它的脱硝效率较之商品氧化铝粉末约提高了15%.

关键词: 氧化铝, 介孔纤维, 水热热分解合成, 表面活性剂辅助, 吸附性能

Abstract: Using template PEG as structure directing agent and urea as the precipitant, alumina microfibers with mesoporous structures were successfully synthesized from a hydrothermal preparation and thermal-decomposition of precursor of ammonium aluminum carbonate hydroxide (denoted as AACH), and its adsorbability was also investigated. The phase state, chemical structure, surface morphology, special surface areas and mesoporous structure of the synthesized alumina microfibers were characterized systemically by means of XRD, SEM, TEM, TG/DTA, and N2 adsoption-desoption techniques, respectively. The adsorptive property of the obtained mesoporous alumina fibers was examined by using a typical SCR(Selective Catalytic Reduction) denitrification facility. The results show that the AACH microfibers with diameter of about 200-300nm and length up to 8μm or 10μm are prepared by using PEG as template. The mesoporous η-Alumina microfibers with specific surface area 316m2/g and average pore diameter 2.5nm are obtained after calcined at 900℃ for 2h, and the morphology is retained in the calcination process. SCR denitrification tests show that the as-prepared mesoporous alumina microfibers exhibit more favorable adsorptive property and its efficiency of denitrification increases approximately 15% compared with commercial γ-Al2O3 powder.

Key words: alumina, porous microfibers, hydrothermal and thermal-decomposition synthesis, surfactant assisted, adsorbability

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