CaX分子筛负载过氯酸镁催化剂的制备及其催化性能

Synthesis and Catalytic Performance of Mg(ClO_4)_2 Loaded CaX Molecular Sieve

由CaX分子筛微波负载Mg(ClO4 ) 2 制得了负载型分子筛催化剂。通过原子吸收测定了负载率 ,并通过XRD、IR、Hammett、BET等方法对CaX Mg(ClO4 ) 2 的结构和物性进行了表征。并将CaX Mg(ClO4 ) 2 分子筛用于催化乙氧基化反应。研究结果表明 ,当微波功率为 6 5 0W ,Mg(ClO4 ) 2 的质量分数为 2 0 % ,负载时间为 2 0min时 ,Mg(ClO4 ) 2 在CaX上的负载率为 17%。负载后分子筛的酸量明显增大。当n(醇 )∶n(环氧乙烷 ) =1∶1,反应温度为 10 0℃ ,反应时间为 2h时 ,醇的转化率达 77% ,产品中环氧乙烷加成数 (EO数 )为 1和 2的占 78% .

CaX Mg(ClO 4 ) 2 molecular sieve has been obtained from CaX in the presence of 20% Mg(ClO 4 ) 2 in mcrowave over of 650 W for 20 min. The product contains 17% Mg(ClO 4) 2 and has been characterized by XRD, IR, Hammett and BET measurements. The acid content of CaX Mg(ClO 4 ) 2 increased obviously in comparison with CaX. When octanol was heated with equal mol of ethylene epoxide(EO) at 100 ℃ for 2 h using CaX Mg(ClO 4 ) 2 catalyst,the conversion of alcohol was 77% and the concentration of (EO) 1 and (EO) 2 was 78%.