Abstract:

Manganese oxide was obtained by selective chemical leaching of lithium ion out from the spent LiMn₂O₄ electrode materials and in-situ phase transformation.The prepared manganese oxide was characterized by X-ray power diffraction (XRD) and showed cubic λ-MnO₂.The λ-MnO₂ powder was found to be an effective catalyst for the synthesis of iso-amyl acetate from acetic acid and iso-amyl alcohol.The reaction results showed that when the leaching sulfuric acid concentration was 0.5 mol·L^-1 and reaction time was 3 h, λ-MnO₂ showed the best catalytic activity and excellent selectivity for esterification of iso-amyl acetate(yield 94.62%).

Key words:

废旧锂离子电池;λ-MnO₂, 催化剂;乙酸异戊酯

摘要： 以废旧锰酸锂（LiMn₂O₄）电池的正极活性材料为原料，通过酸浸脱锂原位转化获得锰氧化物，X射线衍射（XRD）分析表明所得样品为立方晶系的λ-MnO₂ 。实验考察了所制备的λ-MnO₂ 对乙酸和异戊醇合成乙酸异戊酯的酯化反应的催化活性，并探讨了酸浸过程的酸浓度和反应时间对λ-MnO₂ 催化性能的影响。在室温条件下，当硫酸浓度为0.5 mol·L^-1，反应时间为3 h时，所得λ-MnO₂ 催化乙酸异戊酯酯化反应的酯化率高达94.62%。分别采用红外光谱和气相色谱对酯化产物进行了鉴定。结果表明，λ-MnO₂ 催化剂对合成乙酸异戊酯反应具有很好的选择性。

关键词:

废旧锂离子电池;λ-MnO₂, 催化剂;乙酸异戊酯