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Citation: LIU Chang-Jian, ZHANG Yi. Thermal Decomposition of NaNH₄CrO₄•2H₂O[J]. Acta Physico-Chimica Sinica, ;2005, 21(02): 218-220. doi: 10.3866/PKU.WHXB20050222 shu

Thermal Decomposition of NaNH₄CrO₄•2H₂O

LIU Chang-Jian ,
ZHANG Yi

1.
InstituteProcessEngineering,ChineseAcademyofSciences,Beijing　100080;TheKeyLaboratoryofCatalysis,ChinaNationalPetroleumCo.,UniversityofPetroleum,Beijing　102249

Received Date: 10 June 2004
Available Online: 15 February 2005

Thermal decomposition of NaNH4CrO4•2H2O was studied by means of thermogravimetric analysis (TG),differential thermogravimetric (DTG), differential thermal analysis (DTA) and X-ray diffraction (XRD). The results showed that the thermal decomposition of NaNH4CrO4•2H2O proceeds in three steps, i.e., the release of crystal water at temperature from 50 ℃ to 95 ℃ at first, the formation of the intermediates sodium chromate and ammonium dichromate with the partial release of ammonia at temperature from 100 ℃ to 180 ℃,and the complete elimination of ammonia from 215 ℃ to 385 ℃ .In flowing ambient and suitable temperature（400～790 ℃）,the final decomposition product was mostly sodium dichromate. This leads to a cleaner process for sodium dichromate production.
- NaNH₄CrO₄•2H₂O;Thermal decomposition;Cleaner process
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Thermal Decomposition of NaNH4CrO4&#8226;2H2O

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Thermal Decomposition of NaNH₄CrO₄•2H₂O