Reuse of the Waste Zinc Manganese Batteries for Preparing Environmental Catalysts
| Autor: | TZENG,CHI-SHIUN, 曾啟訓 |
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| Rok vydání: | 2016 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 104 This study aims to recycle and regenerate waste zinc-manganese batteries. Based on the existing equipment and technology related to the catalyst in our laboratory, the recycling and regenerating processes of the waste zinc-manganese batteries and environmental catalysts were investigated. The physical and chemical properties of the synthesized catalysts were analyzed and their catalytic activities for different pollutants were tested. The results showed that the major metals of waste zinc-manganese batteries were zinc and manganese. Although the metal contents in different batteries were various; however, their concentrations and compositions were still feasible for the preparation of catalysts. The activity test results showed that the conversion efficiency of propylene by zinc powders in the original zinc-manganese batteries was lower than 20% while that by the manganese powders can reach 99%. With the precipitation and oxidation methods, the waste batteries were prepared to form zinc-manganese catalyst powders. However, their conversion efficiencies for propylene, CO, and NO gases were not good, which was attributed to the active metals being coated with the other species and deactivated during the precipitation. The catalysts were further prepared with different process as the wet impregnation method, in which the mixed powders of waste zinc-manganese batteries were dissolved in the solutions of 70% sulfuric acid, 37% hydrochloric acid, and 70% nitric acid, respectively. Then the commercial catalyst supports were impregnated and calcined to form the catalysts. The results of catalytic activity test showed that the granular zinc-manganese catalysts had high conversion efficiencies (> 90%) for the oxidation reactions of propylene and carbon monoxide. However, the conversion efficiency of nitrogen monoxide was less than 10%, probably due to the relative lower content of active metals and weak activity for reduction reactions. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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