碱金属阳离子对Cu+Y催化甲醇氧化羰基化性能影响的密度泛函理论研究

被引:5
作者
张艳青 [1 ,2 ]
郑华艳 [1 ]
章日光 [1 ]
李忠 [1 ]
王宝俊 [1 ]
赵秋勇 [2 ]
机构
[1] 太原理工大学煤科学与技术教育部和山西省重点实验室
[2] 太原理工大学化学化工学院
关键词
碱金属阳离子; 密度泛函理论; Cu Y分子筛; 氧化羰基化; 碳酸二甲酯;
D O I
暂无
中图分类号
O621.251 [];
学科分类号
摘要
基于密度泛函理论方法构建并优化了Cu MY(M为碱金属阳离子)分子筛的稳定构型,采用速控步骤CO插入CH3O形成CH3OCO反应,研究了碱金属阳离子对Cu+Y分子筛中活性中心周围电子环境及催化甲醇氧化羰基化合成碳酸二甲酯性能的影响.计算结果表明,Li+,Na+和K+稳定落位于Y分子筛小笼中,且随着金属离子半径的增大,CH3OH,CO,CH3O在Cu MY上的吸附能和CO/CH3O的共吸附能均逐渐增加,CO插入CH3O反应的过渡态结构稳定性逐渐降低,活化能逐渐上升,相应的反应活性逐渐下降.而落位在超笼中Ⅱ*位的Rb+与Cs+则随着离子半径的增大,反应过渡态的结构稳定性提高,克服的活化能降低,反应活性升高.不同Cu MY分子筛上催化活性顺序为Cu Li Y-Ⅰ'>Cu Cs Y-Ⅱ*>Cu Na Y-Ⅰ'>CuRb Y-Ⅱ*>Cu KY-Ⅰ'>Cu Cu Y-Ⅰ',其中Cu Li Y-Ⅰ'分子筛克服速控反应的活化能垒(52.74 k J/mol)最低.
引用
收藏
页码:1945 / 1953
页数:9
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