SDY型沸石的浸取处理及其对催化性能的影响

The Leaching Treatment of SDY Zeolite and Its Influence on Catalytic Properties

分别用Ｎａ_２Ｈ_２ＥＤＴＡ、Ｈ_４ＥＤＴＡ和ＨＣｌ对ＳＤＹ型沸石的非骨架铝进行了浸取处理，并应用化学分析、ＸＲＤ、高真空苯吸附、低温Ｎ_２吸附、ＮＨ_３－ＴＰＤ和正庚烷裂解脉冲微型反应等物理和化学实验技术对浸取前后样品的结构、酸性和催化性能进行了研究。发现Ｎａ_２Ｈ_２ＥＤＴＡ能选择地浸取沉积于沸石微孔和二次孔中的非骨架铝碎片，且不损伤沸石骨架，浸取出部分非骨架铝后的样品，其正庚烷裂解和抗氮性能均有所提高。

The extra-framework aluminum of SDY zeolite has been leached out with Na2H2EDTA,H4EDTA and HCl respectively.The structures,acidities and catalytic properties of these samples have been studied by using chemical analyses,XRD,N2 adsorption,NH3-TPD and n-heptane cracking reaction.It is found that Na_2H_2EDTA is a selective extractant which removes only amorphous extra-framework aluminum deposited in the zeolite pores without destroying the framework aluminum,Both the n-heptane cracking activity and nitrogen-resistance properties of SDY-NaE are higher than those of SDY.