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- W2371662016 abstract "Using ammonium chloride (NH_4Cl) as a chlorinating agent, the effects of chlorinating temperature, chlorinating time and NH_4Cl dosage on chlorination of La_2O_3 and CeO_2, and the thermal decomposition of LaCl_3·7H_2O and CeCl_3·7H_2O were investigated. The results show that 80% of both La_2O_3 and CeO_2 can be chlorinated at 300 ℃ for 90 min, and have no advantage to chlorination of lanthanum and cerium oxides at higher temperature. The thermal decomposition of LaCl_3 and CeCl_3 is carried out to explore the mechanism of chlorinating lanthanum and cerium oxides. At the same time, the chlorination of lanthanum and cerium oxides is not devoted to the HCl decomposed from NH_4Cl, but to NH_4Cl directly taking part in the chlorination of La_2O_3 and CeO_2. The lanthanum and cerium oxides in chlorination firstly form intermediate LaOCl and CeOCl, and then transfer to LaCl_3 and CeCl_3, finally to La_2O_3 and CeO_2, respectively. The thermal decomposition analyses of LaCl_3·7H_2O and CeCl_3·7H_2O further prove the existence of the intermediates LaOCl and CeOCl. Therefore the chlorinating temperature and time should strictly be controlled when the lanthanum oxide and cerium oxide are chlorinated with NH_4Cl. And over-dosage of NH_4Cl should be also applied in the process of chlorination." @default.
- W2371662016 created "2016-06-24" @default.
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- W2371662016 date "2003-01-01" @default.
- W2371662016 modified "2023-09-26" @default.
- W2371662016 title "Mechanism of chlorinating lanthanum oxide and cerium oxide with ammonium chloride" @default.
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