气流粉碎分子筛性质和催化性能的研究

微颗粒分子筛的合成研究 ,已得到人们的充分重视 .用合成法可以得到粒径在 1 μm以下的微颗粒分子筛 ,它对于一些特征反应具有许多独特的性能 ,然而由于合成工艺的复杂性 ,还难以将其应用于工业生产 .气流粉碎又称流能磨 ,或称喷射磨 .与传统的机械粉碎机原理不同 ,它是利用高压气体通过喷嘴产生的高速气流所孕育的巨大动能 ,使物料颗粒发生互相冲击碰撞 ,或与固定板 (例如冲击板 )冲击碰撞 ,从而达到粉碎的目的 .其粉碎强度大 ,粉碎产品细、颗粒规整 ,颗粒在高速旋流中分级 ,成品粒度分布狭窄 .气流粉碎已在工业生产的诸多领域发挥了巨大作…

Study on the Properties and Catalytic Performance of Zeolites Pulverized by Air Stream

NaZSM\|5 and Na Y zeolites are pulverized by air stream to obtain fine particles,whose particle size distribution becomes narrower, and the contents of large particles decrease significantly. From XPS research of the pulverized zeolites, it can be seen that some of the atoms, on the external surface fall off, the electron binding energies of O, Si, Al increase, and the surface Al atoms become more homogeneous. Catalytic activities of pulverized zeolites for cumene cracking increase also.