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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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冠醚络合高活性双金属氰化物制备及CO2与环氧丙烷共聚
DOI: 10.1016/S1872-2067(15)60868-3, PP. 1304-1311
Keywords: 双金属氰化物,二氧化碳,环氧丙烷,共聚,冠醚
Abstract:
？首次在共沉淀过程中添加18-冠-6醚络合生成的钾离子得到了均一的高活性冠醚络合的锌-钴双金属催化剂,并用红外光谱(FTIR)、扫描电镜(SEM)、热重红外(TGA-IR)和X射线衍射(XRD)进行了表征.元素分析发现K含量为1.2%.FTIR表明未加冠醚络合的双金属催化剂离心后上下部分呈现不同的络合状态,而冠醚络合的双金属催化剂仍保持均一.SEM表明冠醚络合的双金属催化剂为均一松散的结构.由于生成的钾离子被冠醚络合,不影响聚合反应效果.TGA-IR表明冠醚不仅络合K离子,还参与对金属活性中心的络合.XRD表明此催化剂具有低的结晶度.所制冠醚络合的锌-钴双金属催化剂能成功催化CO2与环氧丙烷共聚,其中CDMC3催化得到的共聚物碳酸酯含量为47.8%,副产物环状碳酸酯为1.5%,催化效率高达5122g/g催化剂(32600g/gZn),明显优于不添加冠醚以同样工艺制备的DMC1(共聚物碳酸酯含量29.2%,副产物环状碳酸酯3.3%,催化效率4100g/g催化剂(16300g/gZn).与不添加冠醚8次洗涤离心得到的DMC2相当(共聚物碳酸酯含量48.3%,副产物环状碳酸酯含量2.4%,催化效率5073g/g催化剂(16400g/gZn)).基于此结果提出了两步的反应机理假设.
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