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In situ high-temperature X-ray diffraction studies of reduction of K2CrO4 and the formation of KxCrOy compounds

Published online by Cambridge University Press:  03 July 2017

Shu-ting Liang
Affiliation:
National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Science, Beijing 100190, China Key Laboratory of Green Process and Engineering, Chinese Academy of Sciences, Beijing 100190, China
Hong-ling Zhang*
Affiliation:
National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Science, Beijing 100190, China Key Laboratory of Green Process and Engineering, Chinese Academy of Sciences, Beijing 100190, China
Min-ting Luo
Affiliation:
National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Science, Beijing 100190, China Key Laboratory of Green Process and Engineering, Chinese Academy of Sciences, Beijing 100190, China
Yu-lan Bai
Affiliation:
College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
Hong-bin Xu
Affiliation:
National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Science, Beijing 100190, China Key Laboratory of Green Process and Engineering, Chinese Academy of Sciences, Beijing 100190, China
Yi Zhang
Affiliation:
National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Science, Beijing 100190, China Key Laboratory of Green Process and Engineering, Chinese Academy of Sciences, Beijing 100190, China
*
a)Author to whom correspondence should be addressed. Electronic mail: hlzhang@ipe.ac.cn

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 °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 °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.

Type
Technical Articles
Copyright
Copyright © International Centre for Diffraction Data 2017 

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