Controlled synthesis and characterization of manganese carbonate microspheres and its thermal decomposition behavior at high temperature

被引：0

作者：

Xu N. ^{[1
,2
,3
]}

Liu Z. ^{[1
]}

Bian S. ^{[1
]}

Dong Y. ^{[1
]}

Li W. ^{[1
]}

机构：

[1] Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining

[2] Department of Chemistry, Qinghai Normal University, Xining

[3] University of Chinese Academy of Sciences, Beijing

来源：

Cailiao Daobao/Materials Review | 2016年 / 30卷 / 08期

关键词：

Citric acid; Manganese carbonates microspheres; Mesoporous structure; Thermal decomposition;

D O I：

10.11896/j.issn.1005-023X.2016.16.009

中图分类号：

学科分类号：

摘要：

MnCO3 microspheres were successfully synthesized by treating KMnO4 in different concentration of citric acid solutions at 160℃ using one-step hydrothermal method. The structure, morphology, thermal stability,textural properties and granularity of the product were characterized by XRD,SEM, TG-DSC, FT-IR, nitrogen adsorption-desorption and laser granularity analyzer. The effects of citric acid dosage, reaction time and temperature on the structures and morphologies of manganese carbonate were investigated systematically. The thermal decomposition behavior of MnCO3 at different temperatures in the air atmosphere was preliminarily discussed. The experimental results indicated that the MnCO3 presented typical mesoporous structure, with pore size, specific surface area and pore vo-lume of 20.9 nm,27.9 m2·g-1 and 0.19 cm3·g-1, respectively. The citric acid dosage had significant influence on the crystal structures of as-prepared product, and MnCO3 microspheres with high-purity could be obtained under an optimized concentration of 1.49 mol/L. Neither time nor temperature in the reaction process had obvious effect on the crystal form and morphology of manganese carbonate. MnCO3 underwent thermal decomposition in air atmosphere, MnO2 generated when the calcination temperature was 300-400℃, Mn2O3 appeared when the calcination temperature was 560℃, and the Mn3O4 was formed when the temperature reached 1000℃. © 2016, Materials Review Magazine. All right reserved.

引用

页码：39 / 44

页数：5

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