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采用气体扩散法,以硝酸铈和碳酸铵为铈源和沉淀剂,利用十六烷基三甲基溴化铵(CTAB)为晶体生长调节剂,得到了物性可控的氧化铈超细粉体.并探索CTAB控制球形氧化铈制备的作用机理.结果表明,CTA+通过静电匹配作用与OH-、CO32-结合,Ce3+定向排列在球形胶束外表面与OH-、CO32-反应生成形貌可控前驱体晶体,焙烧后得到类球形氧化铈粉体.经BET表面积测试,添加CTAB和未加CTAB制备的氧化铈粉体的比表面积分别是100.6855 m2·g-1、83.2782 m2 ·g-1.

In this paper,spherical CeO2 powder materials were synthesized by the gas diffusion method using Ce(NO3)3 as raw materials,(NH4) 2 CO3 as the precipitant and cetyltrimethylammonium bromide (CTAB) as template.The mechanism of CTAB as a template were also discussed.The results show that CTAB could be used as an efficacious crystal growth modifier to induce the self-assembly of precursors,control the crystallization growth of precursor of CeO2 and control the morphology of CeO2 particles by thermal decomposition of the precursors via the positively charged CTA + and OH-,CO~-functional groups electrostatic matching at room temperature.The obtained products in the presence of 1.5 g/L CTAB and the absence of CTAB exhibited the BET surface area of 100.6855 m2/g and 83.2782 m2/g,respectively.

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