HWAHAK KONGHAK, Vol.41, No.3, 326-331, June, 2003
수산화세륨(III)으로부터 질산암모늄세륨(IV)의 제조
Preparation of Ammonium Cerium(IV) Nitrate from Cerium(III) Hydroxide
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초록
본 연구에서는 수산화세륨으로부터 질산세륨 용액 제조 후 질산암모늄 첨가에 의한 질산암모늄세륨 제조시, 출발용액의 산도와 농도 그리고 질산암모늄 첨가량, 반응온도 및 반응시간이 질산암모늄세륨 합성에 미치는 영향을 고찰하였으며, XRD, SEM 그리고 TGA 분석을 통하여 결정의 형태 및 구조에 대한 고찰을 수행하였다. 4가의 수산화세륨을 질산에 용해한 질산세륨(IV) 수용액으로부터 질산암모늄 첨가에 의한 질산암모늄세륨 제조시 회수율을 고려한 최적 합성조건은 출발물질의 세륨 농도 70-100 g/l, 출발용액의 산도 7 mol/l, 질산암모늄 첨가량 2.5당량, 감압ㆍ가열온도 65 ℃ 및 반응시간 15-30 min.이었으며, 제조된 질산암모늄세륨의 결정 화학식은 (NH4)2[Ce(NO3)6]ㆍxH2O(x=6-8)인 것을 알 수 있었다.
Synthetic process of ammonium cerium nitrate from cerium hydroxide was presented and influences of concentration and acidity of starting solution, addition quantity of ammonium nitrate, reaction temperature, reaction time on the yield of ammonium cerium nitrate are discussed. The shape and composition of crystal were determined by SEM, thermogravimetry-differential thermal, x-ray diffraction and chemical analysis. The optimum synthesizing conditions of ammonium cerium nitrate were discribed as follows: rare earth concentration of starting solution 70-100 g/l, acidity of starting solution 7 mol/l, addition quantity of ammonium nitrate 2-3 equivalent, the condition of rotary evaporation 65 ℃ and reaction time 15-30 min. It was also known that the chemical formulae of ammonium cerium nitrate was (NH4)2[Ce(NO3)6] · xH2O(x=6-8) from TGA.
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