Hydrogen Reduction: A Novel Method of Synthesizing Ultra-fine Chromic Oxide Powder

武汉理工大学学报-材料科学版(英文版), 2010, 25(3): 388-390. doi: 10.1007/s11595-010-0007-1

^1, , ^2, , ^3,

1.College of Science, Qingdao University of Agriculture, Qingdao 266109, China

2.National Engineering Laboratory of Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering,Chinese Academy of Sciences, Beijing 100190, China

3.National Engineering Laboratory of Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering,Chinese Academy of Sciences, Beijing 100190, China

基金项目: the Key Program Project of the National Natural Science Foundation of China(50234040) the Major Project of the Knowledge Innovation Program of the Chinese Academy of Sciences(KCCX1-SW-22)

Hydrogen Reduction: A Novel Method of Synthesizing Ultra-fine Chromic Oxide Powder

BAI Yulan ^1, , XU Hongbin ^2, , ZHANG Yi ^3,

1.College of Science, Qingdao University of Agriculture, Qingdao 266109, China

2.National Engineering Laboratory of Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering,Chinese Academy of Sciences, Beijing 100190, China

3.National Engineering Laboratory of Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering,Chinese Academy of Sciences, Beijing 100190, China

Keywords： chromic oxide

The ultra-fine chromic oxide powder was prepared by a novel gas-solid reduction reaction . Na2CrO4 was firstly reduced with hydrogen at 400-600 ℃ . The obtained reduction products,mainly the mixture of NaCrO2 and sodium hydroxide (NaOH), were converted into chromic oxide through hydrolysis followed by calcination . The obtained chromic oxide product was characterized by powder X-ray diffraction (XRD) and SEM . The results show that the hydrolysis process of sodium chromite is the key step and lower reduction temperature helps intensify the hydrolysis process .

参考文献

[1]	T.Tsuzuki;P.G.McCormick .Synthesis of Cr_2O_3 nanoparticles by mechanochemical processing[J].Acta materialia,2000(11):2795-2801.
[2]	Bai YL;Xu HB;Zhang Y;Li ZH .Reductive conversion of hexavalent chromium in the preparation of ultra-fine chromia powder[J].The journal of physics and chemistry of solids,2006(12):2589-2595.

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