工业级纳米氧化锌的合成及性能

The synthesis and properties of industrial-grade zinc oxide

以七水硫酸锌、碳酸氢铵为原料,通过液相沉淀法合成纳米氧化锌前体,并焙烧获得纳米氧化锌。本文采用XRD、TG-DSC、TEM、BET等测试手段对纳米氧化锌及其前体进行表征,研究了焙烧温度对所制备氧化锌形貌、晶型及脱硫活性的影响,结果表明:所获得的碱式碳酸锌为不规则纳米晶,晶粒尺寸约为2~10nm;在不同的焙烧温度下所获得的纳米氧化锌的综合性能存在较大差异,其中在焙烧温度300℃处理所得纳米氧化锌综合性能较高,其晶粒尺寸为5~10nm之间,结晶度较完整,比表面积为41.41m2/g,在220℃脱硫活性较高,穿透硫容>25%;随着焙烧温度的提高,纳米氧化锌的晶化程度加大,表面性质被破坏,比表面积急剧下降,颗粒团聚严重;焙烧温度太低,则纳米氧化锌前体分解不完全,影响其纯度。

In this paper,the precursor of nano zinc oxide was prepared by precipitation method used by zinc sulfate heptahydrate,ammonium bicarbonate,zinc oxide was obtained by calcining the precursor.Nano zinc oxide and its precursors were characterized by XRD,TG-DSC,TEM,BET and other testing methods,investigated the effects of different calcination temperature on the zinc oxide morphology,crystal phase and desulfurization activity by changing calcination temperature of the precursor.the results showed that:the microstructure of obtained basic zinc carbonate appears irregular nanocrystalline with the grain size of about 2—10nm.under different firing temperature,the presence of obtained zinc oxide exists large performance differences,where a higher degree of heat treatment at 300℃ nano zinc oxide showed the best performance,the grain size of which is between 5—10nm with specific surface area of 41.41m2/g and high desulfurization activity that penetration of the sulfur content was over 25% at 220℃.With the increase of calcination temperature,the degree of crystallization of zinc oxide was increased,the surface properties were destroyed,the grain size became larger with the more complete degree of crystallinity,agglomeration was serious.When calcination temperature was too low,the nanozinc oxide precursor decomposition was incomplete,affecting its purity.