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| Study on the synthesis of platinum solution for automotive three-way catalytic converter |
| Liu Guoqi1,2, Ren Zhiyong1,2, Li Huan1,2, Zhi Huanhuan1,2, Wang Hongmei1,2, #br#
Zhang Jing1,2, Bai Yanli1,2, Meng Junjie1,2 |
| 1. Lanzhou Jinchuan Precious Metal Materials Corportation Ltd., Lanzhou 730101, China; 2. National Nickel and Cobalt Advanced Materials Engineering Research Center, Lanzhou 730101, China |
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Abstract In view of the fact that platinum nitrate solution, the precursor of automotive exhaust three-way catalysts, which plays an important role in the effect of automotive exhaust catalysts, can not be stored for a long time and its chemical properties of platinum nitrate solution change to form turbidity and precipitation, the synthesis of the platinum solution for automotive three-way catalysts is mainly studied from the control of impurity ions, the improvement of yield and the stability of platinum solution. The experimental results show that Cl- can be effectively removed by low temperature cooling reaction with a yield of over 90%. Na+ can be removed by soaking and washing with 0.001 mol/L HNO3, which can reduce Na+ in HPA to less than 0.5% and meet the production requirements. When the concentration of dissolved acid is 4.5-6.5 mol/L and the reaction temperature is 50 - 70℃, the particle size of the solution can remain stable.
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