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In situ high-temperature X-ray diffraction studies of reduction of K2CrO4 and the formation of KxCrOy compounds
Liang, Shu-ting; Zhang, Hong-ling; Luo, Min-ting; Bai, Yu-lan; Xu, Hong-bin; Zhang, Yi
2017
Conference Name15th European Powder Diffraction Conference (EPDIC)
Source PublicationArticle; Proceedings Paper
Volume32
Pages168
Conference DateJUN 12-15, 2016
Conference PlaceBari, ITALY
Abstract

In this work, the reduction mechanism of potassium chromate (K2CrO4) was investigated via in situ high-temperature X-ray diffraction coupled with Fourier transform infrared spectroscopy. During the hydrogen reduction of K2CrO4, the formation of K3CrO4, KCrO2, and KxCrO2 were detected for the first time. The study discovered that K2CrO4 was firstly reduced to K3CrO4 and an amorphous Cr(III) intermediate product at low temperature (400-500 degrees C). Moreover, the K3CrO4 was the only crystalline material at this stage. As the temperature increased, a stabilized amorphous CrOOH was formed. At a high temperature (550-700 degrees C), KCrO2 was generated. Interestingly, a portion of KCrO2 was spontaneously decomposed during the hydrogen reduction, accompanying by the formation of K0.7CrO2. Finally, the results clearly illustrated the reduction mechanism of K2CrO4: K2CrO4 -> K3CrO4 amorphous intermediate KCrO2. (C) 2017 International Centre for Diffraction Data.

KeywordIn Situ Xrd Cr2o3 Nanoparticles In Situ Ftir Chromium K2cro4 Chromates Reduction Mechanism Spectra Activated Kxcroy Oxide
DOI10.1017/S0885715617000690
WOS IDWOS:000425747100002
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Document Type会议论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/28976
Collection中国科学院过程工程研究所
Recommended Citation
GB/T 7714
Liang, Shu-ting,Zhang, Hong-ling,Luo, Min-ting,et al. In situ high-temperature X-ray diffraction studies of reduction of K2CrO4 and the formation of KxCrOy compounds[C],2017:168.
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