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| Effect of Element Doping on Catalytic Activity of Precious Metal Three-way Catalysts and Deep Purification |
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Received:March 07, 2014
Revised:March 11, 2014
Accepted:March 12, 2014
Published Online:August 21, 2014
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| DOI：10.3969/j.issn.1007-7545.2014.09.018 |
| KeyWord:precious metal three-way catalyst; doping; P204; extraction; saponification; purification |
| Author | Institution |
| CAO Hong-yang |
广州有色金属研究院稀有金属研究所 |
| WANG Ji-min |
广州有色金属研究院稀有金属研究所 |
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| Abstract: |
| Doped precious metal three-way catalysts were prepared by technology of impregnation-coating. The effects of doping content of Cu, Ni, Co, Pb, Sn and Bi on catalytic activity were investigated. The catalyst deactivation mechanism was preliminarily explored under doping. The effects of P204 content and saponification rate, phase ratio, pH, and extraction series on deep removal of impurity elements from precious metal solution were discussed. The results show that there is no obvious influence on catalyst activity when doping levels of Cu, Ni, Co, Pb, Sn and Bi impurity contents are below 10×10-6. The single-stage extraction rates of Cu、Co、Sn、Bi are 99% above under the conditions of pH=2.0 and extraction duration of 20 min with 30% saponated P204, while content of Ni and Pb in solution can be reduced to 10×10-6 below after three-stage countercurrent extraction with extraction rate of 96.37% and 96.59% respectively. |
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