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MnO-4和Mn2+在酸性条件和一定温度下,用氧化还原方法制得了高结晶度的Cryptomelane型锰氧化物.用X射线粉末衍射法(XRD)、傅里叶红外光谱法(FT-IR)、热重-微商热重差热分析法(TG-DTG/DTA)、透射电子显微镜法(TEM)等方法对它进行了表征.研究表明,该Cryptomelane中可能存在两种不同热力学性质的Cryptomelane,加热Cryptomelane到600℃时,热稳定性较差的那部分转化为Mn2O3;在600~870℃,Cryptome-lane和Mn2O3共同存在;870℃,样品完全转化为Mn2O3;到940℃则Mn2O3再度失氧生成Mn3O4.另在Cryp-tomelane中存在L酸和B酸,且B酸强于L酸.
MnO-4 and Mn2 + have high crystallinity of Cryptomelane manganese oxide prepared by oxidation-reduction method under acidic condition and under certain temperature. The structures of the samples were characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), TG-DTG / DTA and TEM It was characterized. The results show that Cryptomelane may have two different thermodynamic properties in Cryptomelane. Cryptomelane is converted into Mn2O3 by heating Cryptomelane to 600 ℃ with poor thermal stability; Cryptomelaway and Mn2O3 co-exist at 600 ~ 870 ℃; 870 ℃, the sample completely converted to Mn2O3; to 940 ℃ then Mn2O3 again oxygen to generate Mn3O4. In addition, there are L acid and B acid in Cryp-tomelane, and B acid is stronger than L acid.