关键词: 碱式碳酸锌, 纳米氧化锌, 焙烧, 材料合成, 脱硫活性

Abstract: 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 nano-zinc oxide precursor decomposition was incomplete, affecting its purity.

Key words: zinc subcarbonate, nano zinc oxide, calcination, material synthesis, desulfurization activity