Mo修饰对微波法合成β沸石催化剂性能的影响

采用微波辐射方法制备β沸石,再以Mo进行修饰。用X射线衍射、透射电镜和氨吸附程序升温脱附等方法表征β沸石修饰前后酸性和结构特征,研究了凝胶组成和辐射条件对合成β沸石相对结晶度的影响。在固定床反应器上对Mo修饰前后β沸石醚化性能进行了评价。实验结果表明,采用微波辐射方法合成的β沸石结晶度达100%。最佳合成条件为:H2O和SiO2的摩尔比为2.5,pH大于10,辐射温度为140℃,辐射时间为60 min。Mo修饰后β沸石基本保持了原有的形貌特征,且酸强度增加,醚化反应活性提高2.7%。

Effects of Mo Modification on Performance of Zeolite Beta Catalyst by Microwave Radiation Synthesizing

β-zeolite was synthesized by microwave radiation,and then modified by Mo.The acidity and structure characters of β-zeolites were characterized by XRD,TEM and NH_3-TPD before and after modifying.The effects of the sol composition and the radiation condition on the relative crystallinity of β-zeolite were studied.The etherification activity of β-zeolite was evaluated in a fix-bed reactor.The results show that the relative crystallinity of β-zeolite under microwave radiation is 100%.The optimum synthesis conditions are as follows: the mole ratio of H_2O to SiO_2 is 2.5,pH is more than 10,radiation temperature is 140 ℃ and radiation time is 60 min.Mo-modified β-zeolite keeps the original structural characters of β-zeolite,and strength of acid is increased,the activity of etherification increases 2.7%.