Author:
Liang Shu-ting,Zhang Hong-ling,Luo Min-ting,Bai Yu-lan,Xu Hong-bin,Zhang Yi
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.
Publisher
Cambridge University Press (CUP)
Subject
Condensed Matter Physics,Instrumentation,General Materials Science,Radiation
Reference34 articles.
1. In situ X-ray diffraction study of phase transformation of Mg2−x
Pr
x
Ni4 during hydrogenation and dehydrogenation (x = 0.6 and 1.0);Sakaki;J. Phys. Chem.,2011
2. Infrared spectra of the chromates of magnesium, nickel and cadmium
3. Bamberger C. E. and Richardson D. M. (1975). “Chemical cycle for thermochemical production of hydrogen from water,” US 3927192.
4. The enthaply of formation of potassium chromate(V), K3CrO4(c)
5. Spectral evidence for interionic forces in crystal—chromates and dichromates
Cited by
7 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献