The Optimum Operating Conditions of Recycling Spent Zinc-Manganese Battery for the Synthesis of Catalysts

• Main Authors: LEI, WA-RU, 雷婉如
• Other Authors: CHEN,JHIH-CHENG
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/aj9thd

碩士 === 弘光科技大學 === 環境工程研究所 === 105 === In order to improve the benefit of recycling and reuse of waste batteries and improve the value and market of reused products, this study explored the synthesis and application of environmental catalysts from the zinc and manganese recovered materials generated in a waste battery recycling plant. The environmental catalysts were used for air pollution control. The effects of different operating conditions, the catalytic activity of catalysts and the best reaction conditions were investigated. The experimental results show that the recycled materials from waste zinc-manganese battery contained manganese metal (27.07%) and zinc metal (70.84%). Both the metals had good catalytic activities for the decomposition of propylene and CO. In this study, the chemical dissolution method incorporated with the initial wet impregnation method were used to synthesize the catalysts from the recycled zinc and manganese materials. Two-stage experiments were conducted to study the activity and the optimum synthesis condition of environmental catalysts. In the first stage experiment, the catalysts were prepared according to the previous condition and the activity test was carried out with a catalyst reactor. The results showed that the conversion efficiency of propylene by Mn/Al2O3 catalyst can achieve 99% when the reaction temperature was 200℃ and the space velocity was 20,220 hr-1. The conversion efficiency of CO by Zn/SiO2 catalyst achieved 98~100% as the space velocity was 10,110 hr-1 and the reaction temperature was 200~300℃.   In the second stage experiments, different conditions of acid dissolution for the recycled zinc and manganese materials and different wet impregnation conditions were carried out to access the optimum synthesis conditions of catalysts. Experimental results showed that the optimum acid dissolution condition for the recycled zinc material were that acid regent was HCl, acid concentration was 5N, dissolution temperature was 25 ℃, and dissolution time was 2 hours. The optimum acid dissolution condition for the recycled manganese material were that acid regent was HCl, acid concentration was 5N, dissolution temperature was 40 ℃, and dissolution time was 6 hours. Among the acid dissolution parameters, acid concentration was the most important factor, followed by acid regents, dissolution time and dissolution temperature. On the other hand, the results showed that the optimum impregnation conditions for the zinc catalysts were that the support was Al2O3, the impregnation time was 12 hours, and the impregnation method was stationary place. The best impregnation conditions for the manganese catalyst were that the support was Al2O3, the impregnation time was 24 hours and the impregnation method was stationary place. Among the impregnation parameters, the support was the most important factor, followed by the impregnation time and impregnation method. The catalytic activities of synthetic catalysts were tested and found that the conversion efficiency of propylene by the Zn/Al2O3 catalysts prepared with different impregnation time and impregnation method were all more than 99% as the space velocity was 10,110 hr-1 and the reaction temperatures were 200~500℃. The conversion efficiencies of propylene and CO by the Mn/Al2O3 catalysts prepared with different conditions achieved 99% when the space velocity was 10,110 hr-1 and the reaction temperature was 200 ℃. The conversion efficiencies of propylene and CO by the Zn/Zeolite catalysts prepared with different conditions can achieve 90% as the space velocity was 10,110 hr-1 and the reaction temperature was 300℃. All the results show that the catalytic activities of zinc and manganese catalysts for the conversion of propylene and CO were excellent, the recycling and reuse of waste battery for the synthesis of catalysts is feasible and applicable.